<html><body><div style="color:#000; background-color:#fff; font-family:arial, helvetica, sans-serif;font-size:10pt"><div><span>Isn't EVDP for nuclear explosions is < 0.5 km ? I am not sure if there are any records of them in the IRIS DMS though. I suspect this is the reason why meters was used as the default unit to begin with? </span></div><div> </div><div style="color:rgb(162, 162, 162);"><font class="Apple-style-span" face="'bookman old style', 'new york', times, serif" size="1"><b><i>_______________</i></b></font></div><div style="color:rgb(162, 162, 162);"><b><font class="Apple-style-span" face="'bookman old style', 'new york', times, serif" size="1"><font style="font-style:italic;">Serenity isn't freedom from the storm, but peace within the storm</font><br></font></b></div> <div style="color:rgb(162, 162, 162);"><font face="'bookman old style', 'new york', times, serif" size="1"><b>Januka Attanayake </b></font></div> <div
style="color:rgb(162, 162, 162);"><font class="Apple-style-span" face="'bookman old style', 'new york', times, serif" size="1"><b>Earthquake Seismology & Economics<br>The University of Connecticut <br>Beach Hall - U2045<br>354, Mansfield Rd; <br>Storrs, CT 06269<br></b><b>Tel : 860 486 0475 (Office)<br> </b><b> 860 486 3914 (Lab - P405)<br></b></font></div> <div style="color:rgb(134, 135, 164);"><font face="'bookman old style', 'new york', times, serif" size="1"><span style="color:rgb(139, 139, 139);font-weight:bold;"><font class="Apple-style-span">Home page: </font><font class="Apple-style-span"><a rel="nofollow" target="_blank" href="http://sites.google.com/site/janukaattanayake/">http://sites.google.com/site/janukaattanayake/</a></font></span></font></div><div><font class="Apple-style-span" color="#8b8b8b" face="'bookman old style', 'new york', times, serif" size="1"><b>Research
group: <a rel="nofollow" target="_blank" href="http://www.phys.uconn.edu/research/geophysics/index.html">http://www.phys.uconn.edu/research/geophysics/index.html</a><br></b></font><div style="color: rgb(134, 135, 164); font-family: times, serif; "><font class="Apple-style-span" color="#a2a2a2"><br></font><br><br><br><br></div></div><div><br></div><div style="font-size: 10pt; font-family: arial, helvetica, sans-serif; "><div style="font-size: 12pt; font-family: 'times new roman', 'new york', times, serif; "><font size="2" face="Arial"><hr size="1"><b><span style="font-weight:bold;">From:</span></b> Arthur Snoke <snoke@vt.edu><br><b><span style="font-weight: bold;">To:</span></b> SAC-help Listserv <sac-help@iris.washington.edu><br><b><span style="font-weight: bold;">Sent:</span></b> Wednesday, July 20, 2011 7:05 AM<br><b><span style="font-weight: bold;">Subject:</span></b> Re: [SAC-HELP] units of EVDP in SAC<br></font><br>Comments on the
two responses I got so far:<br><br>1) Because traveltime did not work in SAC/IRIS, in the Help file for sss/traveltime <<a href="http://www.iris.edu/software/sac/commands/sss.com/traveltime.html" target="_blank">http://www.iris.edu/software/sac/commands/sss.com/traveltime.html</a>> we recommend using taup_setsac. As with RDSEED, the default is meters for EVDP.<br><br>2) I thought about some variant of George's macsac 1000 switch between meters and kilometers, but not having worked with very shallow events (of any kind) I was not sure where the threshold should be set. A 0 value is no problem, but does one use focal depths of 0.5 km? Patly because of my testing with traveltime, I am planning to changed the EVDP for fg/seismo to 15 km.<br><br>On Tue, 19 Jul 2011, Arthur Snoke wrote:<br><br>> To my knowledge, since IRIS/SAC v100, EVDP (focal depth in the SAC header) has not been used in any SAC command. Please let me know if
there are commands I have overlooked.<br>> <br>> Because of historical reasons, EVDP (focal depth) in SAC has the units according to the SAC manual. RDSEED converts EVDP from kilometers (which it is in blockette 71 in SEED) to meters when writing SAC waveforms.<br>> <br>> For v101.5, the units of EVDP will be of interest because we will (re) introduce a version of the TRAVELTIME command, in which for waveforms with a defined location and origin time one can calculate arrival times for body-wave phases using the iaspei-tau tables for either ak135 or iasp91 velocity models. For this command, the units of EVDP matter.<br>> <br>> I personally would like to evolve towards having kilometers being the default unit for EVDP. As a first step, kilometers would be the default choice for EVDP in TRAVELTIME.<br>> <br>> The point of this note is a canvass of the community to find if there are any problems with using KM rather
than M for EVDP. Let me know if there are other programs that read SAC files and use EVDP assuming it is in meters.<br>> <br>> Arthur<br>_______________________________________________<br>sac-help mailing list<br><a ymailto="mailto:sac-help@iris.washington.edu" 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><br></div></div></div></body></html>