Thread: Fwd: Dear Sir

Started: 2020-01-09 13:06:49
Last activity: 2020-01-09 13:06:49
Topics: SAC Help
Arthur Snoke
2020-01-09 13:06:49
Nasir,

I am forwarding your message to the sac-help listserv, as there are people on that listserv who are better able to answer your question than I.

Arthur


Begin forwarded message:

From: nasir mahmood <earthq5<at>yahoo.com>
Subject: Dear Sir
Date: January 9, 2020 at 12:54:23 PM EST
To: snoke<at>vt.edu
Reply-To: earthq5<at>yahoo.com

Dear Sir
hope you will be fine and with good health. Understand you are a busy researcher.

There is an earthquake of Mw 6.4. The station close to the epicenter QUET has recorded this event. I want to calculate PGA from above attached sac waveform file. I applied sac transfer command to obtain acceleration for the event as below:

SAC> r ./20081028_2230_QUEZ2.sac
SAC> p
SAC> rmean
SAC> rtrend
SAC> p1
SAC> transfer from polezero s ./SAC_PZs_PK_QUET_HHZ_00_2005.001.00.00.00.0000_99999.9999.24.60.60.99999 to acc
SAC> lh


FILE: ./20081028_2230_QUEZ2.sac - 1
-------------------------------

NPTS = 60000
B = 0.000000e+00
E = 5.999900e+02
IFTYPE = TIME SERIES FILE
LEVEN = TRUE
DELTA = 1.000000e-02
IDEP = ACCELERATION (NM/SEC/SEC)

I got output in ACC units (NM/Sec/Sec). Can you help me how to obtain acceleration in m/sec/sec units.
But in actual the PGA for this event is seems not so high as above figure plotted..
The PGA value for this event is ~0.3g. c
Regards

Nasir from Pakistan.




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