SAC Help

A forum for SAC users to exchange ideas and ask questions about SAC usage, installation, portability, etc.

This list has moved to https://groups.google.com/a/earthscope.org/g/sac-community.
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sac-help@lists.ds.iris.edu
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Help

Help lists are for submitting support questions. Anyone can post a question for NSF SAGE (or another team) to answer.

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Active Message Threads for April 2014

T.Serkan Irmak
Multiple spectral file plotting
2014-04-29 00:45:55 - 2014-04-29 16:58:11
____ Yasal Uyari; Bu e-posta, sadece adreste belirtilen kisi veya kurulusun kullanimini hedeflemekte olup, iletide yer alan bilgiler kisiye ozel ve gizli olabilir, yasalar ya da anlasmalar geregi ücüncü kisiler ile paylasilmasi mümkün olmayabilir. Kocaeli Üniversitesi bu mesajin icerigi ile ilgili olarak hicbir hukuksal sorumlulugu kabul etmez. ____Disclaimer; This e-mail communication is intended only for the use of the individual or entity to which it is addressed, and may contain in… [more]
Replies
masoumeh
How to use READCSS command
2014-04-29 13:08:12
Hello,Would you please help me to read the files related to an event by means of SAC 's 'READCSS' command. In CSS format, there is a folder including different files and folders, which is a little bit confusing. I read the IRIS manual for this topic but still the usage is vague for me. Thanks in advance, Makki
No replies
masoumeh
Reading CSS files
2014-04-29 12:58:18
(no body)
Replies
masoumeh
cannot run SAC
2014-04-28 19:04:59 - 2014-04-29 02:24:34
Hello, I follow all steps in README and type the cammands in 'bashcr':     export SACHOME=/usr/local/sac     source ${SACHOME}/bin/sacinit.sh     alias sac='${SACHOME}/macros/init.m' However, when I want to run SAC from terminal, it says:     bash: /usr/local/sac/sacinit.sh : permission denied I also check the content of macro directory but unfortunatly there is no 'init.m' Would you please help me to solve this problem
Replies
masoumeh
Reading CSS format in SAC
2014-04-29 00:00:20
Hello, I am amateur in SAC. In order to understand how to use READCSS I read the manual in http://seismolab.gso.uri.edu/~savage/sac/commands/readcss.html, however I cannot figure out much about it. There is a folder for some recorded events in CSS format. This folder consist of different files that really make me confused. Would you please help me to make this problem more tangible. I find the command as follows: sac2000             ### starts sac2000 readcss file.wfdisc ### read the wfdisc an… [more]
No replies
Hamdi Alkan via LinkedIn
Sac Help, please add me to your LinkedIn network
2014-04-25 13:15:29
LinkedIn ------------ Hamdi Alkan requested to add you as a connection on LinkedIn: ------------------------------------------ I'd like to add you to my professional network on LinkedIn. Accept invitation from Hamdi Alkan http://www.linkedin.com/e/-9ou29g-huf353k2-g/ubIx8rFs5oSdYQa2oQHQ-lofPc2q7sw6cHvfFlhxuru/blk/I581322841_125/3wOtCVFbmdxnSVFbm8JrnpKqlZJrmZzbmNJpjRQnOpBtn9QfmhBt71BoSd1p65Lr6lOfPkOclYNd3wOczcNe3l9bS5kl4VmtShfbP8VdPkMdPgQdzkUc38QcPkSe3kLrCBxbOYWrSlI/eml-comm_invm-b… [more]
No replies
Mike Padgett
Question about the date format in SAC Pole Zero files: 1996.033.24.60.60.99999
2014-04-18 22:21:08 - 2014-04-23 01:18:42
In decoding the date format in SAC Pole Zero files produced by rdseed, a time of Hour = 24, Minute=60, Seconds = 60.99999 is encountered. Should an hour of 24 add 1 day to the date? Should 60 minutes add 1 hour to the number of hours? For instance, in the case of "1996.033.24.60.60.99999", should it be decoded to: Year = 1996 Month = 2 Day = 3 Hour =1 Minutes = 1 Seconds = .99999 Alternatively, how is "1996-02-02T24:60:60" as shown in the file below, to be decoded? Is… [more]
Replies
Mike Padgett
REsend version 5.3.1: Question about the date format in SAC Pole Zero files: 1996.033.24.60.60.99999
2014-04-22 21:13:41
Rdseed was version 5.3.1 installed in a Linux: Fedora 20. Mike Padgett v3 From: Milton Plasencia [mailto:mpplasencia@gmail.com] Sent: Tuesday, April 22, 2014 11:19 AM To: Robert Casey Cc: SAC-help Listserv; Mike Padgett Subject: Re: [SAC-HELP] Question about the date format in SAC Pole Zero files: 1996.033.24.60.60.99999 Hi Rob, Is very good to know the web services return the correct end time. So, the ball pass to Mike, about the rdseed version used. Cheers, Mi… [more]
Replies
Mike Padgett
Re: Thank you: Question about the date format in SAC Pole Zero files: 1996.033.24.60.60.99999
2014-04-22 16:14:11
Dr. PLASENCIA LINARES, Again, thank you for your reply. I will use the start time, sample rate and number of samples from the SAC file to determine the applicable Pole-Zero duration. This end date numbering only becomes a problem if a later Pole-Zero file shows a start date before the end of the Pole-Zero file with Hours=24. I am slowly verifying details, Mike Padgett From: Milton Plasencia [mailto:mpplasencia@gmail.com] Sent: Tuesday, April 22, 2014 2:35 AM To: Mike Padgett Cc:… [more]
No replies
manhlb
send request file to sac-help@iris.washington.edu
2014-04-22 03:01:51
Hi everyone, Before I usually got the earthquake data from website by sending the request files to sac-help@iris.washington.edu: #!/bin/csh cd ~/Desktop/data/req. foreach reqfile ( `ls 20*.req` ) echo $reqfile mail BREQ_FAST@iris.washington.edu < $reqfile end and the request file format: .NAME ManhLe .INST The University of Texas at Austin .MAIL 1 University Station C1100 Austin TX 78712 .EMAIL manhigp@gmail.com .PHONE 512 471-2836 .FAX 512 471-9425 .LABEL evt.2012.07.02.23.31 .MEDIA ELE… [more]
No replies
Nicholas Cline
Installation on Mac running 10.6.8
2014-04-15 22:48:17 - 2014-04-17 17:03:17
Hello all, I am hoping that someone can walk me through the installation process. I am running OS 10.6.8 and I've gone through the steps in the README file several times, but I haven't had any luck completing the installation. I always get the error: -bash: sac: command not found or or ERROR: Environmental variable SACAUX not defined. Many thanks, Nicholas Cline
Replies
Mike Padgett
Tying a Pole-Zero file to the SAC Seed Reference Manual, version 2.4, August, 2014
2014-04-16 22:43:16 - 2014-04-17 02:13:29
Below is a Pole-Z file for network=CI, Station=PAS, channel=VHZ. It was output from rdseed. Questions: 1. Is the appropriate equation from "Pole-Zero Representation for Analog Stages," page 159, equation 6? 2. Is the CONSTANT in the file In (+1.702831e+13) = Sd*A0? 3. How do INSTGAIN and A0, in the file relate to Sd, A0 and the CONSTANT value of +1.702831e+13? Thanks in advance, Mike Padgett * ********************************** * NETWORK (KNETWK): CI * ST… [more]
Replies
Mike Padgett
Time series from CI, IU and II with Quality=Best
2014-04-09 17:14:04 - 2014-04-11 02:41:26
For waveform data that downloads using Breq-Fast with Quality=Best, rdseed produces IDEP=Unknown and a type of "Time Series." For these networks, what are the time series units and have instrument responses been removed? Is raw data available that could be used to verify calculations? Mike Padgett
Replies
Mike Padgett
Units for Time series file and IDEP=UNKNOWN
2014-04-07 21:48:15 - 2014-04-09 16:06:13
The SAC manual lacks details when some of the seed files are a little ambiguous. For instance: For IU, QSPA, Location=20, VHZ seed file: SAC> read 2008.175.21.57.57.6228.IU.QSPA.20.VHZ.M.SAC SAC> LH lists: IFTYPE = TIME SERIES FILE IDEP = UNKNOWN DEPMIN = -1.089e+08 DEPMAX= 1.967e+08 What are these units? If these units are displacement in nano-Meters, then has an instrument response been applied or must one be applied with something like "transfer evalresp to none ..… [more]
Replies
lcazares
help sac
2014-04-02 03:09:54 - 2014-04-02 05:07:59
Hello, i'm not good with the english, but i need to know when I remove the instrument with the command trans from polezero subtype, how do i to put a wood instrument anderson in sac.... thanks
Replies
Samarth
H-K stacking
2014-04-01 11:40:47
Can anyone help me in generating a H-K stack plot(Zhu and Kanamori) to compute poisson ratio from teleseismic receiver functions? Is there any routine on SAC to do it? Sincerely, Samarth
Replies
Martha Savage
instrument response removal syntax.
2014-03-31 06:00:26 - 2014-04-01 02:58:42
Dear Sac users, Sorry for adding more questions on instrument response. We have been trying to do instrument response removal and have had the following concern: I was hoping you might be able to clarify an issue I'm having with the SAC TRANSFER function. In this example, I will use a polezero file, but I found the same problem with response files. My objective is to go from a velocity time series record to a velocity time series record with a removed instrument response. There are two synt… [more]
Replies
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