<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">See below,<div><br><div apple-content-edited="true">
<div>Milton P. Plasencia Linares</div><div><a href="mailto:mpplasencia@gmail.com">mpplasencia@gmail.com</a></div><div><br></div><br class="Apple-interchange-newline">
</div>
<br><div><div>On Feb 18, 2014, at 10:49 AM, satish maurya <<a href="mailto:maurya2278satish@gmail.com">maurya2278satish@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div dir="ltr">Hi Everybody,<div><br></div><div>some discussion is going on pole zeros and response<br><div><br></div><div>I have doubt on using of "SAC transfer",</div><div><b>Using rdseed:</b></div><div>In general pole zeros in displacement (we don't have to add extra zeros because rdseed take-care of this) </div></div></div></blockquote>Correct, if you download seed volumes and convert to sac with P&Z output using rdseed, it add the necessary Zeros and you </div><div>P&Z files give you displacement ( add 2 Zeros if you have acceleration and only one if you have velocity),</div><div>(after applied transfer command in sac), displacement is used to calculate the magnitude. </div><div>rdseed use meters instead sac use nm.</div><div><br><blockquote type="cite"><div dir="ltr"><div><div>and RESP in velocity</div>
<div><div><b>On SAC: we do</b></div><div>r sacfilename</div><div> rmean</div><div> taper</div><div> transfer from polezero subtype PZfile to <b>vel</b> freqlimits 0.001 0.002 1 10 (velocity pole zeros, It's okay because seismogram in vel) I think we have to use Velocity pole zeros...</div></div></div></div></blockquote>Ok, but it depend of your application<br><blockquote type="cite"><div dir="ltr"><div><div>
</div><div><b>OR</b></div></div></div></blockquote><br>This is correct to remove the influence instrument of the signal.<br><blockquote type="cite"><div dir="ltr"><div><div> transfer from polezero subtype PZfile to <b>none</b> freqlimits 0.001 0.002 1 10 (using displacement pole zeros not sure why?)<br></div><div><br></div><div><b>Since, we have seismogram in velocity so our pole zeros in velocity why displacement?</b><br></div></div></div></blockquote>For calculate magnitude.<br><blockquote type="cite"><div dir="ltr"><div><div>
</div><div><b><br></b></div><div><b>Thanks for looking the question and giving Important time...</b><br></div></div></div></blockquote>HTH,</div><div><br></div><div>Milton<br><blockquote type="cite"><div dir="ltr"><div><div><br></div><div><br></div></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Feb 18, 2014 at 8:20 AM, Milton Plasencia <span dir="ltr"><<a href="mailto:mpplasencia@gmail.com" target="_blank">mpplasencia@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">Hi Raja,<div><br></div><div>See below</div><div><div class=""><br><div>
<div>Milton P. Plasencia Linares</div><div><a href="mailto:mpplasencia@gmail.com" target="_blank">mpplasencia@gmail.com</a></div><div><br></div><br>
</div>
<br></div><div><div class=""><div>On Feb 18, 2014, at 4:39 AM, Raja Babu <<a href="mailto:rjbb013@gmail.com" target="_blank">rjbb013@gmail.com</a>> wrote:</div><br><blockquote type="cite"><div dir="ltr">
<div>Hi all<span>,<br><br>normalization constant in radian = (normalization constant in Hz)2π^ (numberof poles−number of zeroes)<br></span></div></div></blockquote></div>Correct, and it is a constant (not change)<div class="">
<br><blockquote type="cite"><div dir="ltr"><div><div><span><br></span></div><span>for displacement normalization constant in above formula, number of zeroes will include one additional zero than velocity normalization constant.?????????</span></div>
</div></blockquote></div>No.</div><div><br></div><div>You must add 1 zero to the P&Z file to convert velocity to displacement, so you multiply by omega(w).<div class=""><br><blockquote type="cite"><div dir="ltr">
<div><div><span>
<br></span></div><span>I have confusion. can anyone clear it<br></span></div></div></blockquote></div>For a bit of clarity and details of units, see:</div><div><a href="http://vps.isti.com/trac/ew/wiki/localmag" target="_blank">http://vps.isti.com/trac/ew/wiki/localmag</a><div class="">
<br><blockquote type="cite"><div dir="ltr"><div><div><span><br></span></div><span>any help will be appreciated..<br><br></span></div><span>and thanks for help...<br></span></div></blockquote></div>Cheers,</div><div>Milton</div>
<div><div class="h5"><div><br><blockquote type="cite"><div dir="ltr"><span>
</span></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, Nov 27, 2013 at 2:17 PM, Milton Plasencia <span dir="ltr"><<a href="mailto:mpplasencia@gmail.com" target="_blank">mpplasencia@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">Hi,<div><br></div><div>You can consider using the PDCC software by IRIS.</div><div><a href="http://www.iris.edu/dms/nodes/dmc/software/downloads/pdcc/" target="_blank">http://www.iris.edu/dms/nodes/dmc/software/downloads/pdcc/</a></div>
<div><br></div><div>For Guralp sensor you must have the TTL value (Tap TableLookup)</div><div>for apply the correct FIR filter combination). look here</div><div><a href="http://www.guralp.com/determining-fir-filter-information-from-gcf-data/" target="_blank">http://www.guralp.com/determining-fir-filter-information-from-gcf-data/</a></div>
<div><br></div><div>HTH,</div><div><br></div><div>m.</div><div><br></div><div>
<div style="text-indent:0px;letter-spacing:normal;font-variant:normal;text-align:-webkit-auto;font-style:normal;font-weight:normal;line-height:normal;text-transform:none;white-space:normal;font-family:Helvetica;word-wrap:break-word;word-spacing:0px">
<div style="text-indent:0px;letter-spacing:normal;font-variant:normal;text-align:-webkit-auto;font-style:normal;font-weight:normal;line-height:normal;text-transform:none;white-space:normal;font-family:Helvetica;word-wrap:break-word;word-spacing:0px">
<div style="text-indent:0px;letter-spacing:normal;font-variant:normal;text-align:-webkit-auto;font-style:normal;font-weight:normal;line-height:normal;text-transform:none;white-space:normal;font-family:Helvetica;word-wrap:break-word;word-spacing:0px">
<span style="border-collapse:separate;border-spacing:0px"><div style="word-wrap:break-word"><span style="border-spacing:0px;text-indent:0px;letter-spacing:normal;font-variant:normal;text-align:-webkit-auto;font-style:normal;font-weight:normal;line-height:normal;border-collapse:separate;text-transform:none;white-space:normal;font-family:Helvetica;word-spacing:0px"><div style="word-wrap:break-word">
<span style="border-spacing:0px;text-indent:0px;letter-spacing:normal;font-variant:normal;text-align:-webkit-auto;font-style:normal;font-weight:normal;line-height:normal;border-collapse:separate;text-transform:none;white-space:normal;font-family:Helvetica;word-spacing:0px"><div style="word-wrap:break-word">
<span style="border-spacing:0px;text-indent:0px;letter-spacing:normal;font-variant:normal;text-align:-webkit-auto;font-style:normal;font-weight:normal;line-height:normal;border-collapse:separate;text-transform:none;white-space:normal;font-family:Helvetica;word-spacing:0px"><div style="word-wrap:break-word">
<div>* * * * * * * * * * * * * * * * * * * * * * *</div><div><div>Milton P. PLASENCIA LINARES</div><div><br></div><div>Centro di Ricerche Sismologiche (CRS)</div><div>OGS - Istituto Nazionale di Oceanografia </div><div> e di Geofisica Sperimentale </div>
<div><br></div><div>Borgo Grotta Gigante 42/C</div><div>(34010) Sgonico - Trieste - Italia</div><div>Tel: <a href="tel:%2B39%20040%202140%20141" value="+390402140141" target="_blank">+39 040 2140 141</a> (Udine)</div><div>
Tel: <a href="tel:%2B39%20040%202140%20256" value="+390402140256" target="_blank">+39 040 2140 256</a> (Trieste)</div><div>Cel.: <a href="tel:%2B39%20331%C2%A06481%20935" value="+393316481935" target="_blank">+39 331 6481 935</a></div>
<div>
<div>Fax: <a href="tel:%2B39-040-327307" value="+39040327307" target="_blank">+39-040-327307</a></div><div><br></div><div>E-mail: <a href="mailto:mplasencia@inogs.it" target="_blank">mplasencia@inogs.it</a></div><div><br>
</div><div>ASAIN (Antarctic Seismographic Argentinean Italian Network)</div>
<div>*********************************</div></div></div><div><br></div></div></span><br></div></span><br></div></span><br></div></span><br></div><br></div><br></div><br><br>
</div>
<br><div><div><div>On Nov 27, 2013, at 3:03 AM, shekar <<a href="mailto:m_shekar2k2@rediffmail.com" target="_blank">m_shekar2k2@rediffmail.com</a>> wrote:</div><br></div><blockquote type="cite">
<div>Hai all<br>
<br>
Any body has the instrument response file(PZ file) for the following combination<br>
<br>
1. Taurus digitizer+ Trillium 240 seismometer(240 sec, 1500v/m/s)<br>
2. Reftek 72A+ CMG 40T(30 sec, 800 v/m/s)<br>
<br>
Thank you very much.<br>
<br>
shekar<br>
<br>
<br>
On Tue, 26 Nov 2013 15:21:35 +0530 wrote<br>
>Send sac-help mailing list submissions to<br>
<br>
<a href="mailto:sac-help@iris.washington.edu" target="_blank">sac-help@iris.washington.edu</a><br>
<br>
<br>
<br>
To subscribe or unsubscribe via the World Wide Web, visit<br>
<br>
<a href="http://www.iris.washington.edu/mailman/listinfo/sac-help" target="_blank">http://www.iris.washington.edu/mailman/listinfo/sac-help</a><br>
<br>
or, via email, send a message with subject or body 'help' to<br>
<br>
<a href="mailto:sac-help-request@iris.washington.edu" target="_blank">sac-help-request@iris.washington.edu</a><br>
<br>
<br>
<br>
You can reach the person managing the list at<br>
<br>
<a href="mailto:sac-help-owner@iris.washington.edu" target="_blank">sac-help-owner@iris.washington.edu</a><br>
<br>
<br>
<br>
When replying, please edit your Subject line so it is more specific<br>
<br>
than "Re: Contents of sac-help digest..."<br>
<br>
<br>
<br>
<br>
<br>
Today's Topics:<br>
<br>
<br>
<br>
1. Re: Insert hedder (Milton Plasencia)<br>
<br>
<br>
<br>
<br>
<br>
----------------------------------------------------------------------<br>
<br>
<br>
<br>
Message: 1<br>
<br>
Date: Tue, 26 Nov 2013 06:45:34 -0300<br>
<br>
From: Milton Plasencia <u></u><br>
<br>
Subject: Re: [SAC-HELP] Insert hedder<br>
<br>
To: shekar <u></u><br>
<br>
Cc: <a href="mailto:sac-help@iris.washington.edu" target="_blank">sac-help@iris.washington.edu</a><br>
<br>
Message-ID: <u></u><br>
<br>
Content-Type: text/plain; charset="us-ascii"<br>
<br>
<br>
<br>
Hi,<br>
<br>
Use<br>
<br>
> ch O GMT 2009 318 13 03 34 300<br>
<br>
<br>
<br>
where 318 is the Julian day corresponding to month 11 and day 14.<br>
<br>
<br>
<br>
HTH,<br>
<br>
<br>
<br>
Milton P. Plasencia Linares<br>
<br>
<a href="mailto:mpplasencia@gmail.com" target="_blank">mpplasencia@gmail.com</a><br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
On Nov 26, 2013, at 6:34 AM, shekar <u></u> wrote:<br>
<br>
<br>
<br>
> Dear all,<br>
<br>
> <br>
<br>
> I have a SAC file converted from SEISAN.<br>
<br>
> <br>
<br>
> How to insert the origin time(2009-11-14-13:03:34.300) of the event in sac header? <br>
<br>
> <br>
<br>
> Thanks in advance<br>
<br>
> <br>
<br>
> Shekar<br>
<br>
> <br>
<br>
> <br>
<br>
> On Mon, 18 Nov 2013 22:14:49 +0530 wrote<br>
<br>
> >Send sac-help mailing list submissions to<br>
<br>
> <br>
<br>
> <a href="mailto:sac-help@iris.washington.edu" target="_blank">sac-help@iris.washington.edu</a><br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> To subscribe or unsubscribe via the World Wide Web, visit<br>
<br>
> <br>
<br>
> <a href="http://www.iris.washington.edu/mailman/listinfo/sac-help" target="_blank">http://www.iris.washington.edu/mailman/listinfo/sac-help</a><br>
<br>
> <br>
<br>
> or, via email, send a message with subject or body 'help' to<br>
<br>
> <br>
<br>
> <a href="mailto:sac-help-request@iris.washington.edu" target="_blank">sac-help-request@iris.washington.edu</a><br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> You can reach the person managing the list at<br>
<br>
> <br>
<br>
> <a href="mailto:sac-help-owner@iris.washington.edu" target="_blank">sac-help-owner@iris.washington.edu</a><br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> When replying, please edit your Subject line so it is more specific<br>
<br>
> <br>
<br>
> than "Re: Contents of sac-help digest..."<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> Today's Topics:<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> 1. Re: sort and plot commands don't play (George Helffrich)<br>
<br>
> <br>
<br>
> 2. Remove Response Instrument (amik Amik)<br>
<br>
> <br>
<br>
> 3. Re: Remove Response Instrument (Arthur Snoke)<br>
<br>
> <br>
<br>
> 4. Re: Remove Response Instrument (Milton P. Plasencia Linares)<br>
<br>
> <br>
<br>
> 5. Calculation of AZ and BAZ in SAC (Fiona Darbyshire)<br>
<br>
> <br>
<br>
> 6. Re: Calculation of AZ and BAZ in SAC (Brian Savage)<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> ----------------------------------------------------------------------<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> Message: 1<br>
<br>
> <br>
<br>
> Date: Wed, 13 Nov 2013 09:03:30 +0000<br>
<br>
> <br>
<br>
> From: George Helffrich <br>
<br>
> <br>
<br>
> Subject: Re: [SAC-HELP] sort and plot commands don't play<br>
<br>
> <br>
<br>
> To: Frederik Tilmann <br>
<br>
> <br>
<br>
> Cc: <a href="mailto:sac-help@iris.washington.edu" target="_blank">sac-help@iris.washington.edu</a><br>
<br>
> <br>
<br>
> Message-ID: <br>
<br>
> <br>
<br>
> Content-Type: text/plain; charset=us-ascii<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> Dear All -<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> Plotting the traces in a record section in SSS displays traces in increasing distance order.<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> On 13 Nov 2013, at 08:49, Frederik Tilmann wrote:<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> > I have a problem in that the plot commands (p1,ppk) do not show the files in the same order as they are listed in memory after a sort.<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > What I am trying to do is to display a north- to south record section of noise correlation functions with respect to a target station. The coordinates of both stations are place in evla and stla, but it is not well defined in which variable a given station ends up in (evla, or stla).<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > So to plot all the functions relative to J10S I use<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > r sumtraces-nonorm-0.03-0.10/*ZWZW*J10?J[0-9][0-9]*_sum.sac sumtraces-nonorm-0.03-0.10/*ZWZW*J[0-9][0-9]?J10?*_sum.sac<br>
<br>
> <br>
<br>
> > sort evla ascend stla ascend<br>
<br>
> <br>
<br>
> > lh evla stla<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > Everything looks good, stations are in the right order in the lh list.<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > But if I then do<br>
<br>
> <br>
<br>
> > p1<br>
<br>
> <br>
<br>
> > or ppk<br>
<br>
> <br>
<br>
> > they come out in the wrong order, plotting the J03-J10 after J10-J11 (correct would have been J09-J10 as in the lh listing). I attach a screenshot demonstrating this effect.<br>
<br>
> <br>
<br>
> > I tried<br>
<br>
> <br>
<br>
> > sort commit evla ascend stla ascend<br>
<br>
> <br>
<br>
> > but this this did not make a difference.<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > This is on 101.5c<br>
<br>
> <br>
<br>
> > SEISMIC ANALYSIS CODE [02/01/2012 (Version 101.5c)]<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > Any ideas would be appreciated<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > Regards<br>
<br>
> <br>
<br>
> > Frederik<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > Output of lh command<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > FILE: sumtraces-nonorm-0.03-0.10/mat__ZWZW.J10BJ23B..HHZHHZ_sum.sac - 1<br>
<br>
> <br>
<br>
> > -------------------------------------------------------------------<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > evla = 5.253600e+01<br>
<br>
> <br>
<br>
> > stla = 5.481430e+01<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > FILE: sumtraces-nonorm-0.03-0.10/mat__ZWZW.J10BJ22B..HHZHHZ_sum.sac - 2<br>
<br>
> <br>
<br>
> > -------------------------------------------------------------------<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > evla = 5.270155e+01<br>
<br>
> <br>
<br>
> > stla = 5.481430e+01<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > FILE: sumtraces-nonorm-0.03-0.10/mat__ZWZW.J10BJ21B..HHZHHZ_sum.sac - 3<br>
<br>
> <br>
<br>
> > -------------------------------------------------------------------<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > evla = 5.287174e+01<br>
<br>
> <br>
<br>
> > stla = 5.481430e+01<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > FILE: sumtraces-nonorm-0.03-0.10/mat__ZWZW.J10BJ20B..HHZHHZ_sum.sac - 4<br>
<br>
> <br>
<br>
> > -------------------------------------------------------------------<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > evla = 5.305374e+01<br>
<br>
> <br>
<br>
> > stla = 5.481430e+01<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > FILE: sumtraces-nonorm-0.03-0.10/mat__ZWZW.J10BJ19B..HHZHHZ_sum.sac - 5<br>
<br>
> <br>
<br>
> > -------------------------------------------------------------------<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > evla = 5.320426e+01<br>
<br>
> <br>
<br>
> > stla = 5.481430e+01<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > FILE: sumtraces-nonorm-0.03-0.10/mat__ZWZW.J10BJ18B..HHZHHZ_sum.sac - 6<br>
<br>
> <br>
<br>
> > -------------------------------------------------------------------<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > evla = 5.339244e+01<br>
<br>
> <br>
<br>
> > stla = 5.481430e+01<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > FILE: sumtraces-nonorm-0.03-0.10/mat__ZWZW.J10BJ17B..HHZHHZ_sum.sac - 7<br>
<br>
> <br>
<br>
> > -------------------------------------------------------------------<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > evla = 5.355617e+01<br>
<br>
> <br>
<br>
> > stla = 5.481430e+01<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > FILE: sumtraces-nonorm-0.03-0.10/mat__ZWZW.J10BJ25B..HHZHHZ_sum.sac - 8<br>
<br>
> <br>
<br>
> > -------------------------------------------------------------------<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > evla = 5.366659e+01<br>
<br>
> <br>
<br>
> > stla = 5.481430e+01<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > FILE: sumtraces-nonorm-0.03-0.10/mat__ZWZW.J10BJ15B..HHZHHZ_sum.sac - 9<br>
<br>
> <br>
<br>
> > -------------------------------------------------------------------<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > evla = 5.390106e+01<br>
<br>
> <br>
<br>
> > stla = 5.481430e+01<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > FILE: sumtraces-nonorm-0.03-0.10/mat__ZWZW.J10BJ14S..HHZHHZ_sum.sac - 10<br>
<br>
> <br>
<br>
> > -------------------------------------------------------------------<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > evla = 5.411258e+01<br>
<br>
> <br>
<br>
> > Waiting<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > stla = 5.481430e+01<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > FILE: sumtraces-nonorm-0.03-0.10/mat__ZWZW.J10BJ13B..HHZHHZ_sum.sac - 11<br>
<br>
> <br>
<br>
> > -------------------------------------------------------------------<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > evla = 5.427260e+01<br>
<br>
> <br>
<br>
> > stla = 5.481430e+01<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > FILE: sumtraces-nonorm-0.03-0.10/mat__ZWZW.J10BJ12B..HHZHHZ_sum.sac - 12<br>
<br>
> <br>
<br>
> > -------------------------------------------------------------------<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > evla = 5.444247e+01<br>
<br>
> <br>
<br>
> > stla = 5.481430e+01<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > FILE: sumtraces-nonorm-0.03-0.10/mat__ZWZW.J10BJ11S..HHZHHZ_sum.sac - 13<br>
<br>
> <br>
<br>
> > -------------------------------------------------------------------<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > evla = 5.460217e+01<br>
<br>
> <br>
<br>
> > stla = 5.481430e+01<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > FILE: sumtraces-nonorm-0.03-0.10/mat__ZWZW.J09BJ10B..HHZHHZ_sum.sac - 14<br>
<br>
> <br>
<br>
> > -------------------------------------------------------------------<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > evla = 5.481430e+01<br>
<br>
> <br>
<br>
> > stla = 5.640510e+01<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > FILE: sumtraces-nonorm-0.03-0.10/mat__ZWZW.J08SJ10B..HHZHHZ_sum.sac - 15<br>
<br>
> <br>
<br>
> > -------------------------------------------------------------------<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > evla = 5.481430e+01<br>
<br>
> <br>
<br>
> > stla = 5.617126e+01<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > FILE: sumtraces-nonorm-0.03-0.10/mat__ZWZW.J07BJ10B..HHZHHZ_sum.sac - 16<br>
<br>
> <br>
<br>
> > -------------------------------------------------------------------<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > evla = 5.481430e+01<br>
<br>
> <br>
<br>
> > stla = 5.603592e+01<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > FILE: sumtraces-nonorm-0.03-0.10/mat__ZWZW.J04BJ10B..HHZHHZ_sum.sac - 17<br>
<br>
> <br>
<br>
> > -------------------------------------------------------------------<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > evla = 5.481430e+01<br>
<br>
> <br>
<br>
> > stla = 5.577234e+01<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > FILE: sumtraces-nonorm-0.03-0.10/mat__ZWZW.J03EJ10B..HHZHHZ_sum.sac - 18<br>
<br>
> <br>
<br>
> > -------------------------------------------------------------------<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > evla = 5.481430e+01<br>
<br>
> <br>
<br>
> > stla = 5.530829e+01<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > FILE: sumtraces-nonorm-0.03-0.10/mat__ZWZW.J02SJ10B..HHZHHZ_sum.sac - 19<br>
<br>
> <br>
<br>
> > -------------------------------------------------------------------<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > evla = 5.481430e+01<br>
<br>
> <br>
<br>
> > stla = 5.512811e+01<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > FILE: sumtraces-nonorm-0.03-0.10/mat__ZWZW.J01EJ10B..HHZHHZ_sum.sac - 20<br>
<br>
> <br>
<br>
> > -------------------------------------------------------------------<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > evla = 5.481430e+01<br>
<br>
> <br>
<br>
> > Waiting<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > stla = 5.497167e+01<br>
<br>
> <br>
<br>
> > SAC><br>
<br>
> <br>
<br></div><div>
> > _______________________________________________<br>
<br>
> <br>
<br>
> > sac-help mailing list<br>
<br>
> <br>
<br>
> > <a href="mailto:sac-help@iris.washington.edu" target="_blank">sac-help@iris.washington.edu</a><br>
<br>
> <br>
<br>
> > <a href="http://www.iris.washington.edu/mailman/listinfo/sac-help" target="_blank">http://www.iris.washington.edu/mailman/listinfo/sac-help</a><br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br></div><div>
> George Helffrich<br>
<br>
> <br>
<br>
> <a href="mailto:george.helffrich@bris.ac.uk" target="_blank">george.helffrich@bris.ac.uk</a><br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> ------------------------------<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> Message: 2<br>
<br>
> <br>
<br>
> Date: Sun, 17 Nov 2013 16:07:33 +0800 (SGT)<br>
<br>
> <br>
<br>
> From: amik Amik <br>
<br>
> <br>
<br>
> Subject: [SAC-HELP] Remove Response Instrument<br>
<br>
> <br>
<br>
> To: "<a href="mailto:sac-help@iris.washington.edu" target="_blank">sac-help@iris.washington.edu</a>" <br>
<br>
> <br>
<br>
> Message-ID:<br>
<br>
> <br>
<br>
> <<a href="mailto:1384675653.16429.YahooMailNeo@web190801.mail.sg3.yahoo.com" target="_blank">1384675653.16429.YahooMailNeo@web190801.mail.sg3.yahoo.com</a>><br>
<br>
> <br>
<br>
> Content-Type: text/plain; charset="iso-8859-1"<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> I am working on a local magnitude research. I want to remove response instrument<br>
<br>
> <br>
<br>
> from the data and simulate the response of Wood Anderson seismograph. What should I do?<br>
<br>
> <br>
<br>
> I have a few questions :<br>
<br>
> <br>
<br>
> 1. Which one the true procedure and command in SAC :<br>
<br>
> <br>
<br>
> ?? a) SAC> trans from evalresp to none<br>
<br>
> <br>
<br>
> ?? ? ?and then<br>
<br>
> <br>
<br>
> ?? ? ?SAC> trans from polezero subtype "file name.pz" to none<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> ?? b) SAC> trans to polezero subtype "wood anderson file name.pz"<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> ?? c) SAC> trans to wa<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> ?? d) SAC> trans from polezero subtype "sation's file name.pz" to wa<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> ?? e) SAC> trans from polezero subtype "sation's file name.pz" to wa to none<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> ?? f) SAC> trans from evalresp fname RESP.SATION to wa<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> ?? g) SAC> SAC> trans from polezero subtype "sation's file name.pz" freq 0.005 0.01 1.0 2.0<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> 2. What the different utilizing of Response File and Polezero File? <br>
<br>
> <br>
<br>
> ?? I think polezero already included in responfile, is it right ?<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> May you help me? Thank You very much<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> Sincerely Yours<br>
<br>
> <br>
<br>
> Ami<br>
<br>
> <br>
<br>
> -------------- next part --------------<br>
<br>
> <br>
<br>
> An HTML attachment was scrubbed...<br>
<br>
> <br>
<br>
> URL: <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> ------------------------------<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> Message: 3<br>
<br>
> <br>
<br>
> Date: Sun, 17 Nov 2013 07:43:55 -0500 (EST)<br>
<br>
> <br>
<br>
> From: Arthur Snoke <br>
<br>
> <br>
<br>
> Subject: Re: [SAC-HELP] Remove Response Instrument<br>
<br>
> <br>
<br>
> To: amik Amik <br>
<br>
> <br>
<br>
> Cc: "<a href="mailto:sac-help@iris.washington.edu" target="_blank">sac-help@iris.washington.edu</a>" <br>
<br>
> <br>
<br>
> Message-ID: <br>
<br>
> <br>
<br>
> Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> I think the best way for you to understand what the various options do is <br>
<br>
> <br>
<br>
> to try them andsave the results. The TRANSFER help file at <br>
<br>
> <br>
<br>
> has answers <br>
<br>
> <br>
<br>
> to your explicit quesitons. If anything is not clear, let me know.<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> On Sun, 17 Nov 2013, amik Amik wrote:<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> > I am working on a local magnitude research. I want to remove response<br>
<br>
> <br>
<br>
> > instrument<br>
<br>
> <br>
<br>
> > from the data and simulate the response of Wood Anderson seismograph. What<br>
<br>
> <br>
<br>
> > should I do?<br>
<br>
> <br>
<br>
> > I have a few questions :<br>
<br>
> <br>
<br>
> > 1. Which one the true procedure and command in SAC :<br>
<br>
> <br>
<br>
> > ?? a) SAC> trans from evalresp to none<br>
<br>
> <br>
<br>
> > ?? ? ?and then<br>
<br>
> <br>
<br>
> > ?? ? ?SAC> trans from polezero subtype "file name.pz" to none<br>
<br>
> <br>
<br>
> ><br>
<br>
> <br>
<br>
> > ?? b) SAC> trans to polezero subtype "wood anderson file name.pz"<br>
<br>
> <br>
<br>
> ><br>
<br>
> <br>
<br>
> > ?? c) SAC> trans to wa<br>
<br>
> <br>
<br>
> ><br>
<br>
> <br>
<br>
> > ?? d) SAC> trans from polezero subtype "sation's file name.pz" to wa<br>
<br>
> <br>
<br>
> ><br>
<br>
> <br>
<br>
> > ?? e) SAC> trans from polezero subtype "sation's file name.pz" to wa to none<br>
<br>
> <br>
<br>
> ><br>
<br>
> <br>
<br>
> > ?? f) SAC> trans from evalresp fname RESP.SATION to wa<br>
<br>
> <br>
<br>
> ><br>
<br>
> <br>
<br>
> > ?? g) SAC> SAC> trans from polezero subtype "sation's file name.pz" freq<br>
<br>
> <br>
<br>
> > 0.005 0.01 1.0 2.0<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > 2. What the different utilizing of Response File and Polezero File?<br>
<br>
> <br>
<br>
> > ?? I think polezero already included in responfile, is it right ?<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > May you help me? Thank You very much<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > Sincerely Yours<br>
<br>
> <br>
<br>
> > Ami<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> ><br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> ------------------------------<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> Message: 4<br>
<br>
> <br>
<br>
> Date: Sun, 17 Nov 2013 14:29:15 +0100<br>
<br>
> <br>
<br>
> From: "Milton P. Plasencia Linares" <br>
<br>
> <br>
<br>
> Subject: Re: [SAC-HELP] Remove Response Instrument<br>
<br>
> <br>
<br>
> To: "amik Amik" <br>
<br>
> <br>
<br>
> Cc: "<a href="mailto:sac-help@iris.washington.edu" target="_blank">sac-help@iris.washington.edu</a>" <br>
<br>
> <br>
<br>
> Message-ID: <<a href="mailto:20131117142915.910179rx5iy7g6nf@webmail.ogs.trieste.it" target="_blank">20131117142915.910179rx5iy7g6nf@webmail.ogs.trieste.it</a>><br>
<br>
> <br>
<br>
> Content-Type: text/plain;charset=ISO-8859-1;DelSp="Yes";<br>
<br>
> <br>
<br>
> format="flowed"<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> look below,<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> **********************************<br>
<br>
> <br>
<br>
> Milton P. PLASENCIA LINARES<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> Dipartimento Centro di Ricerche Sismologiche<br>
<br>
> <br>
<br>
> Istituto Nazionale di Oceanografia e di Geofisica Sperimentale - OGS<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> Borgo Grotta Gigante 42/C<br>
<br>
> <br>
<br>
> (34010) Sgonico - TRIESTE - ITALIA<br>
<br>
> <br>
<br>
> Tel: <a href="tel:%2B39-040-2140%20256" value="+390402140256" target="_blank">+39-040-2140 256</a>/141<br>
<br>
> <br>
<br>
> Fax: <a href="tel:%2B39-040-327307" value="+39040327307" target="_blank">+39-040-327307</a><br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> E-mail: <a href="mailto:mplasencia@inogs.it" target="_blank">mplasencia@inogs.it</a><br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> ASAIN (Antarctic Seismographic Argentinean Italian Network)<br>
<br>
> <br>
<br>
> *********************************<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> Quoting "amik Amik" :<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> > I am working on a local magnitude research. I want to remove <br>
<br>
> <br>
<br>
> > response instrument<br>
<br>
> <br>
<br>
> > from the data and simulate the response of Wood Anderson <br>
<br>
> <br>
<br>
> > seismograph. What should I do?<br>
<br>
> <br>
<br>
> > I have a few questions :<br>
<br>
> <br>
<br>
> > 1. Which one the true procedure and command in SAC :<br>
<br>
> <br>
<br>
> > ?? a) SAC> trans from evalresp to none<br>
<br>
> <br>
<br>
> > ?? ? ?and then<br>
<br>
> <br>
<br>
> > ?? ? ?SAC> trans from polezero subtype "file name.pz" to none<br>
<br>
> <br>
<br>
> ><br>
<br>
> <br>
<br>
> > ?? b) SAC> trans to polezero subtype "wood anderson file name.pz"<br>
<br>
> <br>
<br>
> ><br>
<br>
> <br>
<br>
> > ?? c) SAC> trans to wa<br>
<br>
> <br>
<br>
> ><br>
<br>
> <br>
<br>
> > ?? d) SAC> trans from polezero subtype "sation's file name.pz" to wa<br>
<br>
> <br>
<br>
> Option d) This is fine if you use the polezero station file.<br>
<br>
> <br>
<br>
> ><br>
<br>
> <br>
<br>
> > ?? e) SAC> trans from polezero subtype "sation's file name.pz" to wa to none<br>
<br>
> <br>
<br>
> ><br>
<br>
> <br>
<br>
> > ?? f) SAC> trans from evalresp fname RESP.SATION to wa<br>
<br>
> <br>
<br>
> ><br>
<br>
> <br>
<br>
> > ?? g) SAC> SAC> trans from polezero subtype "sation's file name.pz" <br>
<br>
> <br>
<br>
> > freq 0.005 0.01 1.0 2.0<br>
<br>
> <br>
<br>
> ><br>
<br>
> <br>
<br>
> > 2. What the different utilizing of Response File and Polezero File?<br>
<br>
> <br>
<br>
> Response file include the filter (FIR) coefficients<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> > ?? I think polezero already included in responfile, is it right ?<br>
<br>
> <br>
<br>
> Yes.<br>
<br>
> <br>
<br>
> ><br>
<br>
> <br>
<br>
> > May you help me? Thank You very much<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> My suggest ius use:<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> > transfer from polezero subtype "PZ file" to wa freq 0.005 0.01 1.0 2.0<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> ><br>
<br>
> <br>
<br>
> ><br>
<br>
> <br>
<br>
> > Sincerely Yours<br>
<br>
> <br>
<br>
> > Ami<br>
<br>
> <br>
<br>
> ><br>
<br>
> <br>
<br>
> Cheers,<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> Milton<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> ----------------------------------------------------------------<br>
<br>
> <br>
<br>
> This message was sent using IMP, the Internet Messaging Program.<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> ------------------------------<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> Message: 5<br>
<br>
> <br>
<br>
> Date: Mon, 18 Nov 2013 08:01:33 -0500<br>
<br>
> <br>
<br>
> From: Fiona Darbyshire <br>
<br>
> <br>
<br>
> Subject: [SAC-HELP] Calculation of AZ and BAZ in SAC<br>
<br>
> <br>
<br>
> To: <a href="mailto:sac-help@iris.washington.edu" target="_blank">sac-help@iris.washington.edu</a><br>
<br>
> <br>
<br>
> Message-ID:<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> Content-Type: text/plain; charset=ISO-8859-1<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> Hello,<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> Could someone tell me a bit more about how AZ and BAZ are calculated in SAC?<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> Up to now, e.g. when binning receiver functions, I have used BAZ and<br>
<br>
> <br>
<br>
> GCARC to group them together, and that's always seemed to work, so<br>
<br>
> <br>
<br>
> I've always assumed that the BAZ/GCARC (or DIST, I imagine) pair gives<br>
<br>
> <br>
<br>
> you a unique position from the point of interest (the station).<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> This time, I have some data output that is expressed in AZ and DIST. I<br>
<br>
> <br>
<br>
> assumed (perhaps naively?) that this would also allow successful<br>
<br>
> <br>
<br>
> spatial grouping, but it turns out not to be the case; one can have<br>
<br>
> <br>
<br>
> the same forward azimuth for several different locations.<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> Here's the example where I found the issue:<br>
<br>
> <br>
<br>
> Station lat, lon: 82.5033, -62.35 (ALE)<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> Event1: lat 80.205, lon -1.091<br>
<br>
> <br>
<br>
> Event 2: lat 86.876, lon 54.373<br>
<br>
> <br>
<br>
> The two events are almost 1000km apart.<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> Event 1: AZ 313, BAZ 72, GCARC 9, DIST 1006<br>
<br>
> <br>
<br>
> Event 2: AZ 314, BAZ 17, GCARC 9, DIST 1042<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> I'd like to know more about the calculation, in particular because (i)<br>
<br>
> <br>
<br>
> I'd like to reassure myself that BAZ/distance does indeed give a<br>
<br>
> <br>
<br>
> unique location, and (ii) I don't understand how AZ is calculated. One<br>
<br>
> <br>
<br>
> website I looked at (Matlab) talks about rhumb lines vs great-circles;<br>
<br>
> <br>
<br>
> is that the issue? Will an AZ/distance pair always be non-unique?<br>
<br>
> <br>
<br>
> (Also most websites define back-azimuth as simply 180 opposite to<br>
<br>
> <br>
<br>
> azimuth, but I guess they aren't talking about spherical geometry<br>
<br>
> <br>
<br>
> then...)<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> Thanks for any insight.<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> Fiona Darbyshire.<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> Centre de recherche GEOTOP, Universit? du Qu?bec ? Montr?al<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> ------------------------------<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> Message: 6<br>
<br>
> <br>
<br>
> Date: Mon, 18 Nov 2013 11:38:44 -0500<br>
<br>
> <br>
<br>
> From: Brian Savage <br>
<br>
> <br>
<br>
> Subject: Re: [SAC-HELP] Calculation of AZ and BAZ in SAC<br>
<br>
> <br>
<br>
> To: SAC HELP <br>
<br>
> <br>
<br>
> Message-ID: <<a href="mailto:8D3AE955-FCD5-48D4-8643-4E4E25115DEF@uri.edu" target="_blank">8D3AE955-FCD5-48D4-8643-4E4E25115DEF@uri.edu</a>><br>
<br>
> <br>
<br>
> Content-Type: text/plain; charset="windows-1252"<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> Fiona,<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> The implementation of the computation of Great Circle Distance (degrees), Azimuth, Back Azimuth, and Distance (km) is based off of Rudoe's formula found in Geodesy by R.Bomford (1980). It assumes a Radius of 6378.160 km and a flattening of 1/298.2466081. I can send you the appropriate pages from R. Bomford (1980) if you would like.<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> The azimuth and back-azimuth will generally not be offset by180 degrees, and some pairs of point will have "odd-looking" (not event close to 180 degrees) azimuth/back azimuth pairs. <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> Note: There are more robust methods of calculating these quantities and the current implementation in SAC as well as many other implementations, up until recently [1], have trouble with particular pairs of points. For over ~ 99% of point pairs SAC's implementation produces the correct result, but that last 1% can be incorrect (sometimes badly).<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> I hope this helps.<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> Brian Savage<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> [1] Karney, C. F. F. (2013). "Algorithms for geodesics". Journal of Geodesy 87 (1): 43?42. arXiv:1109.4448. Bibcode:2013JGeod..87...43K. doi:10.1007/s00190-012-0578-z (open access). Addenda.<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> On Nov 18, 2013, at 8:01 AM, Fiona Darbyshire wrote:<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> > Hello,<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > Could someone tell me a bit more about how AZ and BAZ are calculated in SAC?<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > Up to now, e.g. when binning receiver functions, I have used BAZ and<br>
<br>
> <br>
<br>
> > GCARC to group them together, and that's always seemed to work, so<br>
<br>
> <br>
<br>
> > I've always assumed that the BAZ/GCARC (or DIST, I imagine) pair gives<br>
<br>
> <br>
<br>
> > you a unique position from the point of interest (the station).<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > This time, I have some data output that is expressed in AZ and DIST. I<br>
<br>
> <br>
<br>
> > assumed (perhaps naively?) that this would also allow successful<br>
<br>
> <br>
<br>
> > spatial grouping, but it turns out not to be the case; one can have<br>
<br>
> <br>
<br>
> > the same forward azimuth for several different locations.<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > Here's the example where I found the issue:<br>
<br>
> <br>
<br>
> > Station lat, lon: 82.5033, -62.35 (ALE)<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > Event1: lat 80.205, lon -1.091<br>
<br>
> <br>
<br>
> > Event 2: lat 86.876, lon 54.373<br>
<br>
> <br>
<br>
> > The two events are almost 1000km apart.<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > Event 1: AZ 313, BAZ 72, GCARC 9, DIST 1006<br>
<br>
> <br>
<br>
> > Event 2: AZ 314, BAZ 17, GCARC 9, DIST 1042<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > I'd like to know more about the calculation, in particular because (i)<br>
<br>
> <br>
<br>
> > I'd like to reassure myself that BAZ/distance does indeed give a<br>
<br>
> <br>
<br>
> > unique location, and (ii) I don't understand how AZ is calculated. One<br>
<br>
> <br>
<br>
> > website I looked at (Matlab) talks about rhumb lines vs great-circles;<br>
<br>
> <br>
<br>
> > is that the issue? Will an AZ/distance pair always be non-unique?<br>
<br>
> <br>
<br>
> > (Also most websites define back-azimuth as simply 180 opposite to<br>
<br>
> <br>
<br>
> > azimuth, but I guess they aren't talking about spherical geometry<br>
<br>
> <br>
<br>
> > then...)<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > Thanks for any insight.<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > Fiona Darbyshire.<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br>
> > Centre de recherche GEOTOP, Universit? du Qu?bec ? Montr?al<br>
<br>
> <br>
<br>
> > <br>
<br>
> <br>
<br></div><div>
> > _______________________________________________<br>
<br>
> <br>
<br>
> > sac-help mailing list<br>
<br>
> <br>
<br>
> > <a href="mailto:sac-help@iris.washington.edu" target="_blank">sac-help@iris.washington.edu</a><br>
<br>
> <br>
<br>
> > <a href="http://www.iris.washington.edu/mailman/listinfo/sac-help" target="_blank">http://www.iris.washington.edu/mailman/listinfo/sac-help</a><br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br></div><div>
> -------------- next part --------------<br>
<br>
> <br>
<br>
> An HTML attachment was scrubbed...<br>
<br>
> <br>
<br>
> URL: <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> ------------------------------<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br></div><div>
> _______________________________________________<br>
<br>
> <br>
<br>
> sac-help mailing list<br>
<br>
> <br>
<br>
> <a href="mailto:sac-help@iris.washington.edu" target="_blank">sac-help@iris.washington.edu</a><br>
<br>
> <br>
<br>
> <a href="http://www.iris.washington.edu/mailman/listinfo/sac-help" target="_blank">http://www.iris.washington.edu/mailman/listinfo/sac-help</a><br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br></div><div>
> End of sac-help Digest, Vol 97, Issue 2<br>
<br>
> <br>
<br>
> ***************************************<br>
<br>
> <br>
<br>
> <br>
<br>
> <br>
<br>
> Get your own FREE website, FREE domain & FREE mobile app with Company email. <br>
<br>
> Know More ><br>
<br></div>
> <2009-11-14-1304-50S.KGD___003_KGD___HH_Z_SAC>_______________________________________________<div><br>
<br>
> sac-help mailing list<br>
<br>
> <a href="mailto:sac-help@iris.washington.edu" target="_blank">sac-help@iris.washington.edu</a><br>
<br>
> <a href="http://www.iris.washington.edu/mailman/listinfo/sac-help" target="_blank">http://www.iris.washington.edu/mailman/listinfo/sac-help</a><br>
<br>
<br>
<br></div><div>
-------------- next part --------------<br>
<br>
An HTML attachment was scrubbed...<br>
<br>
URL: <u></u><br>
<br>
<br>
<br>
------------------------------<br>
<br>
<br>
<br></div><div>
_______________________________________________<br>
<br>
sac-help mailing list<br>
<br>
<a href="mailto:sac-help@iris.washington.edu" target="_blank">sac-help@iris.washington.edu</a><br>
<br>
<a href="http://www.iris.washington.edu/mailman/listinfo/sac-help" target="_blank">http://www.iris.washington.edu/mailman/listinfo/sac-help</a><br>
<br>
<br>
<br>
<br>
<br></div><div>
End of sac-help Digest, Vol 97, Issue 7<br>
<br>
***************************************<br>
<br>
<br><table style="font-family:Verdana;font-size:11px;line-height:15px" cellpadding="0" cellspacing="0" border="0" height="57" width="100%"><tbody><tr><td><a href="http://sigads.rediff.com/RealMedia/ads/click_nx.ads/www.rediffmail.com/signatureline.htm@Middle?" target="_blank"><img src="http://sigads.rediff.com/RealMedia/ads/adstream_nx.ads/www.rediffmail.com/signatureline.htm@Middle"></a></td>
</tr></tbody></table><table cellpadding="0" cellspacing="0"><tbody><tr><td><div style="font-family:Arial,Helvetica,sans-serif;font-size:14px">Get your own <span style="padding-bottom:0px;background-color:#cc0000;padding-left:3px;padding-RIGHT:3px;font-family:Arial,Helvetica,sans-serif;color:#ffffff;font-size:12px;padding-top:0px"><b>FREE</b></span> website, <span style="padding-bottom:0px;background-color:#c00;padding-left:3px;padding-RIGHT:3px;font-family:Arial,Helvetica,sans-serif;color:#ffffff;font-size:12px;padding-top:0px"><b>FREE</b></span> domain & <span style="padding-bottom:0px;background-color:#c00;padding-left:3px;padding-RIGHT:3px;font-family:Arial,Helvetica,sans-serif;color:#ffffff;font-size:12px;padding-top:0px"><b>FREE</b></span> mobile app with Company email. </div>
</td><td><a href="http://track.rediff.com/click?url=___http://businessemail.rediff.com/company-email-hosting-services?sc_cid=sign-1-10-13___&cmp=host&lnk=sign-1-10-13&nsrv1=host" style="font-family:Arial,Helvetica,sans-serif;color:#fff;font-size:14px;color:#0000cc" target="_blank"><b>Know More ></b></a></td>
</tr></tbody></table></div><div>_______________________________________________<br>sac-help mailing list<br><a href="mailto:sac-help@iris.washington.edu" target="_blank">sac-help@iris.washington.edu</a><br><a href="http://www.iris.washington.edu/mailman/listinfo/sac-help" target="_blank">http://www.iris.washington.edu/mailman/listinfo/sac-help</a><br>
<u></u><u></u><u></u><u></u><u></u></div></blockquote></div><br></div><br>_______________________________________________<br>
sac-help mailing list<br>
<a href="mailto:sac-help@iris.washington.edu" target="_blank">sac-help@iris.washington.edu</a><br>
<a href="http://www.iris.washington.edu/mailman/listinfo/sac-help" target="_blank">http://www.iris.washington.edu/mailman/listinfo/sac-help</a><br>
<br></blockquote></div><br></div>
_______________________________________________<br>sac-help mailing list<br><a href="mailto:sac-help@iris.washington.edu" target="_blank">sac-help@iris.washington.edu</a><br><a href="http://www.iris.washington.edu/mailman/listinfo/sac-help" target="_blank">http://www.iris.washington.edu/mailman/listinfo/sac-help</a><br>
</blockquote></div><br></div></div></div></div><br>_______________________________________________<br>
sac-help mailing list<br>
<a href="mailto:sac-help@iris.washington.edu">sac-help@iris.washington.edu</a><br>
<a href="http://www.iris.washington.edu/mailman/listinfo/sac-help" target="_blank">http://www.iris.washington.edu/mailman/listinfo/sac-help</a><br>
<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div dir="ltr"><div><div><div><font color="#996633">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</font></div>
<div><font color="#996633">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</font></div>
<div><span style="font-family:arial narrow,sans-serif"><b>Satish Maurya</b></span></div><span style="font-family:arial narrow,sans-serif"><b> Ph.D. student<br>Dept. of Seismology<br></b></span></div><span style="font-family:arial narrow,sans-serif"><b></b></span></div>
<span style="font-family:arial narrow,sans-serif"><b></b></span><div><b>IPGP, France</b><div><font color="#996633">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</font></div>
<div><font color="#996633">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</font></div></div></div>
</div>
_______________________________________________<br>sac-help mailing list<br><a href="mailto:sac-help@iris.washington.edu">sac-help@iris.washington.edu</a><br>http://www.iris.washington.edu/mailman/listinfo/sac-help<br></blockquote></div><br></div></body></html>