NNC RK observation network

"Akbulak" seismic array (ABKAR)

Akbulak seismic array is located in Aytikebi district of Aktyubinsk area near Taldyk settlement. The site is situated in the south part of Akbulaksayskiy granite massif of upper Paleozoic age (ɣ PZ3).

Akbulak seismic array consists of 10 observation points, located in two concentric circles with one central site. Radius of the inner circle is ~500 m, outer circle ~2000 m. Nine one-component vertical GS-21 (Geotech Instruments) seismometers 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 the Table 1.

Response and phase characteristics of the installed seismometers are here.

Table 1
Coordinates and depth of “Akbulak” (ABKAR) seismic array boreholes

Site №
Seismometer, type
Borehole
depth, m
Latitude
Longitude
Elevation above
sea level, m
Notes
AB31
KS 54000
80
N49.2556
E59.9431
233
three-component
AB01
GS 21
80
N49.2556
E59.9431
233
vertical
AB02
GS 21
40
N49.2591
E59.9466
230
vertical
AB03
GS 21
40
N49.2511
E59.9431
234
vertical
AB04
GS 21
40
N49.2578
E59.9371
236
vertical
AB05
GS 21
40
N49.2736
E59.9431
239
vertical
AB06
GS 21
40
N49.2611
E59.9693
231
vertical
AB07
GS 21
40
N49.2410
E59.9593
230
vertical
AB08
GS 21
40
N49.2387
E59.9280
234
vertical
AB09
GS 21
40
N49.2614
E59.9181
237
vertical

Communication system of “Akbulak” seismic array

Information from remote sites of “Akbulak” seismic array, AB01 – AB31 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 “Akbulak” seismic array are transmitted to American National Data Center (USNDC) in Florida (USA).