Makanchi seismic station was opened in 1970 specially for nuclear monitoring. It is located in Eastern Kazakhstan 60 km from Kazakhstan Chinese border.

In 1994 the station was transferred to the Institute of Geophysical Research NNC RK. The same year a 3-component DAS Reftek station was installed at the station under the JSP program. An additional IRIS/GSN 3-component station began operation in autumn of 1996. The IRIS/GSN station is equipped with STS-1, STS-2 seismometers and FBA-23 accelerometer, installed in a tunnel 10 m below the Earth surface. The characteristics of the equipment are listed in the table 1. The Data from IRIS/GSN station are sent to the USGS Albuquerque Seismological Laboratory (USA).

In 1996 according to CTBTO protocol, Makanchi seismic array (MAK, PS23) was included in the primary IMS network. The array is located about 25 km away from Makanchi station. Construction of the seismic array and equipment installation was performed in joint effort of CTBTO, AFTAC (USA) and IGR NNC RK, and was finished in the year 2000. All the seismic equipment is installed in 10 inch wide boreholes. The depths of sensors installation and their coordinates are shown in table 2. Besides there are two 3-component stations MK31 and MK32 (one in a borehole, and the other one on the surface), that detect seismic signals using KS54000 (borehole) and GS-13 (surface) seismometers. Seismometers KS54000 and GS-13 register 3 components of seismic signals: vertical (Z) and two horizontal: North-South (NS) and East - West (EW). The GS-13 seismometers were additionally installed on MK 32 for high frequency signal registration.

On this page you can see amplitude-phase and frequency characteristics of the installed seismometers.

During the year 2001 Makanchi seismic array was tested. In January 2002 the array was certified as a Primary .

Table 1
Main Parameters of the Seismic Equipment Installed at Makanchi Station at Different Times.

Year	Station	Station Code	Latitude	Longitude	Seismometers	DAS Parameters	Time Service	Registration Channels
1994-1996	Makanchi	MAK	N46.8075	E81.9774	STS-2	24 bit, RT	OMEGA	Z, NS, EW
08/1996	Makanchi	MAKZ	N46.8075	E81.9774	STS-1, 20STS-2, 80, 40 GS-13, 40 FBA-23	24 bit, Quanterra,Q380	GPS	Z, NS, EW
08/28/2000	Makanchi array	MKAR			GS-23,KS-54000 GS-13	24 bit, PS-23	GPS	9 boreholes Z channels, 1 borehole Z, NS, EW channels

Table 2.
Coordinates and Depths of Boreholes at Makanchi Seismic Array.

Borehole #	Seismometer, type	Borehole depth, m	Latitude, N	Longitude, E	Absolute level of Estuary, m	Notes
MK31	KS 54000, long-period	61	46°47'37.,45"	82°17'25.227"	615,41	3-component
MK32	GS-13, short-period	0	46°47'37.46"	82°17'25.223"	615,41	3-component
MK01	GS 21, short-period	31	46°46'12.3"	82°18'01.4"	609,36	1-component
MK02	GS 21, short-period	30,5	46°46'10.01"	82°18'31.08"	638,99	1-component
MK03	GS 21, short-period	30,5	46°45'56.5"	82°18'05,4"	630,77	1-component
MK04	GS 21, short-period	31	46°46'17.4"	82°17'42.4"	589,91	1-component
MK05	GS 21, short-period	31	46°47'37.5"	82°17'28.88"	615,41	1-component
MK06	GS 21, short-period	31	46°46'30.,48"	82°18'48.21"	637,65	1-component
MK07	GS 21, short-period	31	46°45'13.,94"	82°18'56.4"	627,90	1-component
MK08	GS 21, short-period	31	46°45'19.2"	82°16'58.7"	607,62	1-component
MK09	GS 21, short-period	30	46°46'27.9"	82°16'37.15"	579,86	1-component

Communication structure of Makanchi seismic array

The data from the remote elements of Makanchi seismic array via telemetric channels is sent to the central data acquisition point, where three incoming data streams are merged into one outgoing which is forwarded to the Data Center in Almaty. The system is operated remotely from the central data acquisition point. From the AlmatyData Center the data are sent in real time to the International Data Center in Vienna and US National Data Center in Florida (USA).