SAC Help

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

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Active Message Threads for February 2009

Guust Nolet
2009-02-26 20:32:28 - 2009-02-27 18:45:18
Can Brian or anyone else tell me what the plans are to provide the sacio.a library for 64 bit machines? This seems an urgent matter to me because most of us have tons of software that we cannot recompile with a 32 bit flag without getting into messy problems. best wishes, Guust Geosciences Azur 250, Rue Albert Einstein 06560 Sophia Antipolis France +
Omar Bin Afif
2009-02-24 15:21:49
Hi Sac, I set up a Facebook profile where I can post my pictures, videos and events and I want to add you as a friend so you can see it. First, you need to join Facebook! Once you join, you can also create your own profile. Thanks, Omar To sign up for Facebook, follow the link below: This e-mail may contain promotional materials. If you do not wish to receive future commercial mailings from Facebook, please click on the … [more]
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Melaku Ayenew
2009-02-23 19:33:58
hi all, I am new to sac i was wandering if somebody can tell me What comand(s) in sac allows to measure the period for ms and ml amplitude . And how do I get the amplitude for mL and ms estimates. melaku New Mexico State University
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I am a VERY new user for the SAC data files and working on a window system. Currently, I'm using a MATLAB function (rsac) to convert sac files to a usable data format (3 columns: time, dependent variable, header information). I've been able to figure out the time units used, but am having trouble deciphering the units, magnitude, and form of the dependent variable. How can I determine if the dependent variable is acceleration, displacement, velocity, etc? Also, is there a way that I can de… [more]
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Mohamed Kamaleldin Abdel Galeil Salah
2009-02-11 22:44:38 - 2009-02-17 00:32:46
Hi all, I have some BB SAC files for a sensor CMG-40TD (Guralp systems) and I want to remove the instrument response from the seismogram. I prepared a file ´pz´'as follows: ZEROS 4 0 0 0 159 POLES 3 -50.0 0.0 -0.02356 + j0.02356 -0.02356 - j0.02356 CONSTANT -0.314 I have two questions: 1. Is such data ok for the instrument type given above? 2. when I run the command: transfer from polezero subtype pz to none, from within SAC, I get the following message: Extracting poleze… [more]
2009-02-11 23:36:14
Hi everyone, When I remove the instrument response, by poles&zeros or response files, I come across the following messages/errors: * Calper is not available. Cannot tell if response is normalized, so transfer function will be used without scaling. * Calib is not available. Cannot tell if scale factor has been applied on input, so transfer function will be used without scaling. * WARNING: FIR normalized Would you know what one of more of these messages mean? Thanks a lot for helping me out, S… [more]
No replies
2009-02-10 10:25:12
Dear Sac user's,     My problem is I can't read my file after saving it to the disk. For example, the original file is the amplitude file in x,y file type. Then, performing the division operation by other file, and then FFT, will produce the spectral data file type. Which I have to save it on my disk as a file(in binary or ASCII). The problem is, when, I save it using the command "WRITE SAC" it successfully saves my file, as binary, spectral file. But, when, I use the command "WRITE SP", with n… [more]
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Stanton, Megan
2009-02-09 22:41:32 - 2009-02-10 03:01:56
If you are looking for the actual commands to make picks look in the command listing for plotpk for all the options. Just place your cursor on where you want to make the pick and then type in the desired attributes. Usually you have (e)mergent or (i)mpulsive, (u)p or (d)own, quality (0,1,2,3,4), (p)wave or (s)wave. The letters or numbers in parenthesis are what you would type. Once you are done it will show you your pick and label it. Re-pick by moving the cursor and typing it in again. http://… [more]
Melaku Ayenew
2009-02-09 18:55:45
hi all, I am just starting to learn sac ,and have some difficulties using the PLOTPK command, I know it produces a plot for picking of arrival time, by problem is how i pick those arrival times after i got the plot with a x-y cursor. Do i need to creat hypo file to store the picks, please be more explicit. thank you melaku Bogale New Mexico State University
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