NNC RK observation network

“Karatayu” seismic array (KKAR)

Karatayu (KKAR) seismic array is located at Talas region of Zhambyl area near Karatayu town. The site is situated on granite massif of leucocratic granite of upper Ordovician age (ɣО3). Karatau seismic array consists of 10 observation points, located in two concentric circles with one central site. Radius of the inner circle is ~500 m, radius of the outer circle is ~2000 m. One-component vertical GS21 seismometers (Geotech Instruments) are installed at 9 sites. In addition, there is a broadband three-component station with KS54000 seismometer (Geotech Instruments). Recording instruments are 24-bit ADC AIM24S (Science Horizons). Sample rate: 40 samples/sec/channel. Seismic data are digitized according to GPS. Coordinates and parameters of the boreholes, where the seismometers are installed, are listed in Table 1.

Response and phase characteristics of the seismometers installed at the station are here.

Table 1
Coordinates and depth of “Karatayu” (KKAR) seismic array boreholes

Site №
Seismometer, type
Borehole
depth, m
Latitude
Longitude
Elevation above
sea level, m
Notes
KK31
KS 54000
60
N43.1034
E70.5115
521
three-component
KK01
GS 21
50
N43.1054
E70.5061
525
vertical
KK02
GS 21
50
N43.1034
E70.5115
521
vertical
KK03
GS 21
50
N43.1028
E70.5012
529
vertical
KK04
GS 21
50
N43.1098
E70.5060
523
vertical
KK05
GS 21
50
N43.1170
E70.5235
510
vertical
KK06
GS 21
50
N43.0944
E70.5255
534
vertical
KK07
GS 21
50
N43.0891
E70.5008
526
vertical
KK08
GS 21
50
N43.1048
E70.4871
543
vertical
KK09
GS 21
50
N43.1224
E70.4995
546
vertical

Communication system of “Karatayu” seismic array

Information from remote sites of Karatayu seismic array, KK01 – KK31 is transferred via radiotelemetric channels to the Central Recording Facility where three incoming data streams are merged into one outgoing which is forwarded to the Data Center in Almaty via satellite channels. The system is operated remotely from the Central Recording Facility and from the Data Center. From Almaty the data of Karatayu seismic array are transmitted to American National Data Center (USNDC) in Florida (USA).