Hi, <div><br></div><div> Sorry, oops! I had posted the wrong time span. The response file from IRIS has the same poles and zeros throughout. Allow me the repost:</div><div><br></div><div>=======</div><div><font color="#222222" face="arial, sans-serif"><span style="white-space:nowrap"><div>
#</div><div>###################################################################################</div><div>#</div><div>B050F03 Station: RDM</div><div>B050F16 Network: AZ</div><div>B052F03 Location: ??</div>
<div>B052F04 Channel: BHE</div><div>B052F22 Start date: 2004,056,18:43:30</div><div>B052F23 End date: 2011,204,18:14:59</div><div>#</div><div># +-----------------------------------+</div>
<div># | Response (Poles and Zeros) |</div><div># | AZ RDM BHE |</div><div># | 02/25/2004 to 07/23/2011 |</div><div># +-----------------------------------+</div>
<div>#</div><div>B053F03 Transfer function type: A</div><div>B053F04 Stage sequence number: 1</div><div>B053F05 Response in units lookup: M/S - velocity in meters per second</div>
<div>B053F06 Response out units lookup: V - emf in volts</div><div>B053F07 A0 normalization factor: +5.74357E+12</div><div>B053F08 Normalization frequency: +2.00000E-01</div>
<div>B053F09 Number of zeroes: 5</div><div>B053F14 Number of poles: 9</div><div># Complex zeroes:</div><div># i real imag real_error imag_error</div>
<div>B053F10-13 0 +0.00000E+00 +0.00000E+00 +0.00000E+00 +0.00000E+00</div><div>B053F10-13 1 +0.00000E+00 +0.00000E+00 +0.00000E+00 +0.00000E+00</div><div>B053F10-13 2 -1.51500E+01 +0.00000E+00 +0.00000E+00 +0.00000E+00</div>
<div>B053F10-13 3 -3.18600E+02 +4.01200E+02 +0.00000E+00 +0.00000E+00</div><div>B053F10-13 4 -3.18600E+02 -4.01200E+02 +0.00000E+00 +0.00000E+00</div><div># Complex poles:</div><div># i real imag real_error imag_error</div>
<div>...</div><div><br></div><div><br></div><div>From all helps and also to my understanding that the instrument may change over different times, therefore the poles and zeros should be different from time to time.</div><div>
But at least from my requested file, it is pretty much the same through out 2000-2011.</div><div><br></div><div>--Tien</div></span></font></div><div><br><br><div class="gmail_quote">On Wed, Mar 14, 2012 at 12:35 PM, Milton Plasencia <span dir="ltr"><<a href="mailto:mplasencia@inogs.it">mplasencia@inogs.it</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
Hi Tien,<br>
<br>
at first glance, if you see the start time of the response files are different, so<br>
i think that are different instruments.<br>
cheers,<br>
<br>
Milton<br>
<div class="HOEnZb"><div class="h5"><br>
<br>
On Mar 14, 2012, at 7:57 PM, Tien-Huei Wang wrote:<br>
<br>
> Hi all,<br>
> I 've been using broadband data from IRIS on research and recently encounter a confusing thing about response.<br>
> I am using the BH* channels of network AZ, and it should be velocity data. I downloaded sac files from SCEC stp.<br>
> I originally request response file in SEED format, then extracted it to be RESP.AZ.XXX..BHX, the response file.<br>
> Recently, because I want to confirm the amplitudes in velocity and also in displacement is correct, I went to IRIS SeismiQuery to get the response file updated until 2011. Surprisingly, the extracted response file from my SEED format and the response file from SeismiQuery are different.<br>
> The RDSEED extracted response file has 2 zeros and 5 poles, but the response file from SeismiQuery has 5 zeros 9 poles.<br>
> I thought 2 zeros is standard for velocity response, had no idea what the 5 zeros are. They are from the same time span for same station.<br>
><br>
> Post front portion of RESP files<br>
> 1. from RDSEED:<br>
> =================================<br>
> # << IRIS SEED Reader, Release 4.7.5 >><br>
> #<br>
> # ======== CHANNEL RESPONSE DATA ========<br>
> B050F03 Station: RDM<br>
> B050F16 Network: AZ<br>
> B052F03 Location: ??<br>
> B052F04 Channel: BHE<br>
> B052F22 Start date: 2004,056,18:43:30<br>
> B052F23 End date: No Ending Time<br>
> # =======================================<br>
> # + +--------------------------------------------+ +<br>
> # + | Response (Poles & Zeros), RDM ch BHE | +<br>
> # + +--------------------------------------------+ +<br>
> #<br>
> B053F03 Transfer function type: A [Laplace Transform (Rad/sec)]<br>
> B053F04 Stage sequence number: 1<br>
> B053F05 Response in units lookup: M/S - velocity in meters per second<br>
> B053F06 Response out units lookup: V - emf in volts<br>
> B053F07 A0 normalization factor: 5.91892E+07<br>
> B053F08 Normalization frequency: 0.159155<br>
> B053F09 Number of zeroes: 2<br>
> B053F14 Number of poles: 5<br>
> # Complex zeroes:<br>
> # i real imag real_error imag_error<br>
> B053F10-13 0 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00<br>
> B053F10-13 1 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00<br>
> # Complex poles:<br>
> # i real imag real_error imag_error<br>
> B053F15-18 0 -3.701000E-02 3.701000E-02 0.000000E+00 0.000000E+00<br>
> B053F15-18 1 -3.701000E-02 -3.701000E-02 0.000000E+00 0.000000E+00<br>
> B053F15-18 2 -2.513000E+02 0.000000E+00 0.000000E+00 0.000000E+00<br>
> B053F15-18 3 -1.310000E+02 4.673000E+02 0.000000E+00 0.000000E+00<br>
> B053F15-18 4 -1.310000E+02 -4.673000E+02 0.000000E+00 0.000000E+00<br>
><br>
><br>
> 2. from SeismiQuery<br>
> ======================================<br>
><br>
> ###################################################################################<br>
> #<br>
> B050F03 Station: RDM<br>
> B050F16 Network: AZ<br>
> B052F03 Location: ??<br>
> B052F04 Channel: BHE<br>
> B052F22 Start date: 2000,264,20:11:00<br>
> B052F23 End date: 2001,250,20:49:00<br>
> #<br>
> # +-----------------------------------+<br>
> # | Response (Poles and Zeros) |<br>
> # | AZ RDM BHE |<br>
> # | 09/20/2000 to 09/07/2001 |<br>
> # +-----------------------------------+<br>
> #<br>
> B053F03 Transfer function type: A<br>
> B053F04 Stage sequence number: 1<br>
> B053F05 Response in units lookup: M/S - velocity in meters per second<br>
> B053F06 Response out units lookup: V - emf in volts<br>
> B053F07 A0 normalization factor: +5.74357E+12<br>
> B053F08 Normalization frequency: +2.00000E-01<br>
> B053F09 Number of zeroes: 5<br>
> B053F14 Number of poles: 9<br>
> # Complex zeroes:<br>
> # i real imag real_error imag_error<br>
> B053F10-13 0 +0.00000E+00 +0.00000E+00 +0.00000E+00 +0.00000E+00<br>
> B053F10-13 1 +0.00000E+00 +0.00000E+00 +0.00000E+00 +0.00000E+00<br>
> B053F10-13 2 -1.51500E+01 +0.00000E+00 +0.00000E+00 +0.00000E+00<br>
> B053F10-13 3 -3.18600E+02 +4.01200E+02 +0.00000E+00 +0.00000E+00<br>
> B053F10-13 4 -3.18600E+02 -4.01200E+02 +0.00000E+00 +0.00000E+00<br>
> # Complex poles:<br>
> # i real imag real_error imag_error<br>
> B053F15-18 0 -3.70000E-02 +3.70000E-02 +0.00000E+00 +0.00000E+00<br>
> B053F15-18 1 -3.70000E-02 -3.70000E-02 +0.00000E+00 +0.00000E+00<br>
> B053F15-18 2 -1.59900E+01 +0.00000E+00 +0.00000E+00 +0.00000E+00<br>
> ...<br>
><br>
><br>
> Does anyone know why and how this will affect our final outcome? What are the outputs and will they be consistent?<br>
><br>
> Thanks,<br>
><br>
> --Tien<br>
</div></div><div class="HOEnZb"><div class="h5">> _______________________________________________<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>
</div></div></blockquote></div><br></div>