The KMA network component naming delineates the sensor as follows, the Z-component is used as an example:
Sensor Channel Rate (Hz)
STS-2 HHZ 100
BHZ 20
LHZ 1
SS-1 SLZ 100
ELZ 20
Epi HGZ 100
BGZ 20
Positive numbers on the Z, N and E channels represent ground motion in the Z, N and E directions.
In the instrument responses given here, the FIR filter coefficients are not presented. The normalized pole-zero responses, calibration factor, and the system pole-zero responses are given. The system pole-zero responses consist of multiplying the constant in the normalized response by the calibration factor. The calibration factor in turn is constructed from the A/D sensitivity and the actual sensor gain.
Sensor | Normalized Response | Normalized Response Plot | Sensor output | Digitizer | Calib | Total Response | Total Response Plot |
STS-2 | sts2.rsp | sts2.png | 1500 V/m/sec | 419460 counts/V | 6.29190E+08 counts/m/s | asts2.rsp | asts2.png |
SS-1 | ssa.rsp | ssa.png | 150 V/m/sec | 419460 counts/V | 6.29190E+07 counts/m/s | ass1.rsp | ass1.png |
Episensor | epi.rsp | epi.png | 40 V/g | 419460 counts/V | 1.713E+06 counts/m/s/s | aepi.rsp | aepi.png |
Two SHELL scripts work with gsac to
plot the responses.
DONRESP plots the
normalized responses sts2.rsp,
ss1.rsp and
epi.rsp. The output figures are
sts2.png, ss1.png and eps.png respectively. DOARESP plots the total responses asts2.rsp,
ass1.rsp and
aepi.rsp with units of counts/m/sec,
counts/m/sec and counts/m/sec/sec, respectively.
The output files are
asts2.png, ass1.png and aeps.png respectively.
The response plots can be seen by clicking on the respective link in the table.
transfer from polezero subtype asts2.rsp to none freqlimits 0.005 0.01 10 20
To convert an SS-2 channel to ground velocity in m/sec using gsac or sac2000, the following command is used:
transfer from polezero subtype ass1.rsp to none freqlimits 0.05 0.1 10 20
To convert from the Episensor channel to ground acceleration in m/sec/sec, the following command is used:
transfer from polezero subtype aepi.rsp to none freqlimits 0.05 0.1 20 40
To convert the resulting acceleration to ground velocity, one next integrated using the SAC command
int
The freqlimits option to the transfer command can be
adjusted to achieve stability in
the deconvolution. The values given in the example are chosen on the
basis of the desired frequencies of interest for the 100 sps channel
and also the expectation
of bands in which there is good signal to noise.
The shell scripts developed for processing KMA data build upon these
commands