“Aktyubinsk” infrasound station (IS31, I31KZ)

A primary infrasound station of the International Monitoring System (IMS) CTBTO “Aktyubinsk” IS31 (IS31KZ) is located at Tassay settlement of Chromtayu region, Aktyubinsk area. The station was constructed in 2001, the KNDC archive has the station’s data from December 2003.

The detailed information can be found at: https://www.kndc.kz/kndc/docs/publication/2002_3.pdf

Until the fall of 2019 the infrasound sensors – microbarometers МВ2000 together with Aubrac digitizers were installed in the bunkers. In total, there were eight such equipment vaults. Systems H and L differed by device construction for wind interference suppression. In the fall of 2019 there was thorough upgrade of the station. Another ninth element was added, the wind suppression systems were unified. The microbarometers were replaced with MB-3. The meteorological station was installed at the station. The sample rate is 20 samples/sec/channel. Time scale is GPS. Infrasound data are transferred to the Center Processing Facility via fiber optic lines , and then together with seismic data of AKTO station to the IDC via a satellite channel.

Below are some parameters of the Aktyubinsk station (IS31/I31KZ):

Site #

Seismometer, type

Borehole depth, m

Latitude

Longitude

Elevation above sea level, m

Notes

H1

MB3

0

50.40690°N

58.03485°E

367

 

H2

MB3

0

50.40861°N

58.03431°E

367

 

H3

MB3

0

50.40759°N

58.03838°E

367

 

H4

MB3

0

50.40496°N

58.03688°E

368

 

H5

MB3

0

50.40338°N

58.03428°E

373

 

H6

MB3

0

50.40601°N

58.03340°E

369

 

H7

MB3

0

50.41322°N

58.04816°E

365

 

H8

MB3

0

50.39694°N

58.03779°E

360

 

H9

MB3

0

50.41019°N

58.01769°E

372

 



Response and phase characteristics of the installed microbarometers are:

Response and phase characteristics of the installed microbarometers

 

Configuration of “Aktyubinsk” infrasound station (IS31, I31KZ):

Configuration of “Aktyubinsk” infrasound station (IS31, I31KZ)

 

 

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