In 2017, a string of eight three-component geophones was deployed in one of the vertical boreholes (62.17954, 6.99089, elevation of 673 m). The geophone spacing is 5 m; the first geophone (1) is approximately at 15 m below ground level while the deepest geophone (8) is at 50 m, i.e., just above the sliding plane which depth is estimated between 52 and 55 m at this place. Data are recorded continuously with a 1000 Hz sampling rate.
The figures below show the vertical component records of each geophone for a chosen day. The yellow stars indicate the occurrence of events detected by the surface network.