Thread: Vertical Velocity add Acceleration evaluation

Dear list members

As I am a new user of SAC not familiar with seismograms, I have faced some
primiliary questions. I would appreciate if you guide me.

-I am looking for vertical components of velocity and acceleration from
seismograms. So I used the TRANSFER function of SAC applying on LHZ
seismogram. I used respond file and PZ files as follows and gained similar
results for vertical velocity. Regarding the acceleration the results are
zero!!!. How I can evaluate vertical acceleration? If I convert the
seismogram LHZ to velocity and acceleration, are these values the exact
corresponding values or I have to add other channels? In other words, do I
need to evaluate vertical components of others like LHN?? Because at each
station that I am using the data, there are 16 different seismograms.(HHE,
HHN,HHZ, HNE,HNN, HNZ,LDD, LHE,LHN,LHZ,LME,LMN,LMZ,LNE,LNN,LNZ) I expect I
just need to transfer $$Z channels. if my assumption is correct, I just
need to transfer LHZ? or other $$Z channel are better?

the command that I used in SAC is:


--
%%using RESP file

clear all

SETBB RESP "RESP.NV.NC27..LHZ"

r LHZ27.SAC

RTR

TAPER

TRANSFER FROM EVALRESP FNAME %resp TO ACC freq 0.004 0.007 10 20

%%using PZ file

clear all

SETBB pzfile "SAC_PZs_NV_NC27__LHZ"

r HZ27.SAC

RTR

TAPER

TRANS FROM POLEZERO S %pzfile TO ACC FREQ 0.004 0.007 10 20

MUL 1.0e9

Regards



------------------------------
Ali Abdolali
Coastal Engineer.
PhD. Candidate, Department of Civil Engineering, University of Roma
No,62, Via Vito Volterra, Rome, Italy
Tel: +39-3884781904, +39-0657333635 Fax: +39-06-57333441
website: http://www.uniroma3.it
E-mail: *ali.abdolali<at>uniroma3.it <aabdolali<at>uniroma3.it>*

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