Earthquakes in Switzerland and surrounding regions during 2007

This report of the Swiss Seismological Service summarizes the seismic activity in Switzerland and surrounding regions during 2007. During this period, 531 earthquakes and 92 quarry blasts were detected and located in the region under consideration. Of these earthquakes, 30 are aftershocks of the stimulation of a proposed geothermal reservoir beneath the city of Basel in December of 2006. With 20 events with M (L) a parts per thousand yen 2.5, four of which were artificially induced, the seismic activity in the year 2007 was far below the average over the previous 32 years.