NNC RK observation network

“Borovoye” seismic array (AS057, BVAR)

An auxiliary seismic array of the International Monitoring System (IMS) “Borovoye” AS057 (BVAR) is located at Byurabay region of Akmola area of Republic of Kazakhstan near Vorobyevka settlement on the territory of "Burabai" National Park. The site is located within Borovoye granite massif. This massif relates to granite intrusions of silur- low Devonian age. The site is located in eastern peripheral part of the massif..

The seismic array configuration is the following: around center BVA0, BVA1 on circles of radius ~700m and ~1500 m there are two boreholes contours with seismic sensors. The central sensor (BVA0) is broadband, three-component CMG-3TB (Guralp), other 9 seismometers are one-component, vertical GS21 (Geotech Instruments).

Recording instruments are 24-bit ADC Europa (Nanometrics). Sample rate: 40 samples/sec/channel. Seismic data are digitized according to GPS. In December 2002 the station was certified by the IMS commission.

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

Table 1
Coordinates of the equipment boreholes and technical site of “Borovoye” (AS057, BVAR) array

Site №
Seismometer, type
Borehole
depth, m
Latitude
Longitude
Elevation above
sea level, m
Notes
BVA0
CMG-3TB
62
53.0249
70.3885
423
three-component
BVA1
GS 21
53
53.0249
70.3886
422
vertical
BVA2
GS 21
31
53.0189
70.3912
433
vertical
BVA3
GS 21
30
53.0268
70.3785
411
vertical
BVA4
GS 21
31
53.0290
70.3963
440
vertical
BVA5
GS 21
31
53.0247
70.3662
391
vertical
BVA6
GS 21
31
53.0361
70.3762
403
vertical
BVA7
GS 21
31
53.0379
70.3950
434
vertical
BVA8
GS 21
31
53.0216
70.4108
504
vertical
BVA9
GS 21
32
53.0123
70.3857
414
vertical

Communication system of “Borovoye” seismic array (AS057, BVAR)

Information from remote sites of the seismic array BVA0-BVA4 and BVB5-BVB9 is transferred via optic fiber communication channels to the Central Recording Facility. Further the information is forwarded via satellite channels to the International Data Center (Vienna) and to Data Center (Almaty) simultaneously. The system is operated remotely from the Central Recording Facility. In Almaty, in addition to operation with seismic data, it is also possible to control seismic array stations status.