The downhole microseismic network in 2004 and 2005 consisted of three accelerometers (4-component sensors) built by the CSMA and three Calidus type high temperature 3-component geophone receivers. The three accelerometers were located in boreholes 4550, 4601 and EPS1.

The three geophones were located in boreholes OPS4, GPK1 and 4616. The geophone in 4616 was a passive Calidus type 3 component sensor. It was deployed at the end of June 2004. This sensor had no downhole gain and was used to monitor larger events that saturate the rest of the network at around 2.3 ML during the monitoring. The majority of the events were too small to be detected by this tool so it brought little benefit to the location. It was also quite close to 4550 and so has not been used for the microseismic event locations (Dyer, B.C., 2005.Soultz GPK4 stimulation September 2004 to April 2005. Seismic monitoring report).

The X,Y,Z coordinates in the file refer to the local coordinate system with the GPK1 wellhead as origin:

X: Easting in meters from GPK1 wellhead (toward magnetic East)

Y: Northing in meters from GPK1 wellhead (toward magnetic North)

Z: Depth in meters from GPK1 wellhead

The local coordinate system is based on the UTM32 system.

The coordinates of the stations in the local coordinate system have been obtained from the Semore Seismic report for Socomine by B.C. Dyer, 2005 (Soultz GPK4 stimulation September 2004 to April 2005. Seismic monitoring report).

The latitude, longitude and elevation in the WGS84 coordinate system have been derived from the local coordinate system.

Last update of data: 25/02/2022