News: Complete Instrument Responses of the KAZNET

Instrument Response: Kazakstan Broadband Seismographic Network

Updated instrument responses consisting of poles and zeros for seismometer response, as well as digital FIR filter coefficients for each channels since July 1994 are available in Dataless SEED and CSS3.0 relational database formats. You can download them from this site or from the IRIS-DMC in Seattle, WA (ftp, pub/dropoffs).
Note that each station of the eight-station Kazakstan BB seismographic network has three-component, broadband sensor (STS-2 or CMG-3ESP) and a RefTek DAS unit (see Table 4 below). Seismic signals are recorded continuously with a nominal sampling rate of 40 samples/sec (see Table 3 below).

For users who retrieved seismogram data in SEED volumes from the IRIS DMC (Data Management Center) in the past, some of those SEED volumes might not have correct instrument responses (mainly gain). In this case, you can still use the SEED volume and data by reading the SEED volume using the external, "alternative response" file by setting environment variable as:

setenv  ALT_RESPONSE_FILE    KZ.DATALESS_SEED.2000.001.bin

before you retrieve the waveform data using "rdseed" (Read SEED) program.

Figure 2:Amplitude responses of seismographs on 08/22/1998.

Download KZ Instrument Response in dataless SEED
Download KZ Instrument Response in CSS3.0 database
Download KZ Instrument Response plot in PostScript file

Instrument Response

Several types of seismometers were used to record the seismic signals since the summer of 1994. For example, during a 100-ton chemical calibration explosion in 22 August 1998, sensors and dataloggers used are listed in Table 4. The short-period seismometer (L4C, T0 = 1 sec) was used at KKL for the 100-ton explosion. The 21-element Kurchatov cross-array has borehole short-period, vertical-component seismometers (K-213, T0 = 2 sec) manufactured during the Soviet era. The K-213 seismometers were installed in the early 1970's in the boreholes at various depths with average emplacement depth of about 25 m. The array was refurbished in the late 1980's and again in January 1995. The K-213 seismometer has flat amplitude response between 0.5 and 5 Hz to input ground velocity, however, each element was not individually calibrated.


Table 3: Characteristics of Seismographs in 1998
Station codeStation name Sensor modelSample rate A/D (bits)
AKT Aktyubinsk CMG-3 40 16
BAY Bayanaul CMG-3 100 24
BRVK Borovoye CMG-3 40 24
CHK Chkalovo STS-2 100 24
KKL Karkalarinsk L4C 100 24
KUR Kurchatov STS-2 200 24
MAK Makanchi STS-2 100 24
TLG Talgar CMG-3 40 16
VOS Vostochnoye STS-2 100 24
ZRN Zerenda STS-2 100 24
KUR21 Cross-array K-213 40 16


Sensor Sensor Natural period Sensitivity passband
model type (sec) (V/[M/s]) (Hz)
L4C short-period 1 166.75 1.0-50
K-213 short-period 2 75000.00 0.5-10
CMG-40T broad-band 30 800.00 0.03-50
CMG-3 broad-band 30 2000.00 0.03-50
STS-2 broad-band 120 1500.00 0.008-45
Table 4: Characteristics of the Seismometers Used

Last Edited: Feb 28, 2000