Induced seismicity in Basel
The largest event prompted concern from local residents. The six borehole seismometers installed near the Basel injection well to monitor the natural background seismicity and the geothermal stimulation recorded more than 13,500 potential events connected with the geothermal project, from which 3,124 were of sufficient quality to permit [hypocenter] determinations in the period 2–12 December 2006, which spanned the main stimulation and the decline in the event rate. During the post-stimulation period from 13 December 2006 onward, a further 350 locatable events were detected up to 2 May 2007, by which time events were occurring sporadically at around one per day. In all, locations for more than 3,500 events were determined.
List of earthquakes in 2007
Earthquakes in 2007 resulted in about 712 fatalities. The 2007 Peru earthquake was the deadliest with 519 fatalities. The September 2007 Sumatra earthquake was the largest in 2007 with an 8.5 on the moment magnitude scale. The 2007 Solomon Islands earthquake caused a significant tsunami that killed 52 people. There were four 8.0 or higher earthquakes in 2007 which is the most ever recorded for a single year. Other significant earthquakes in 2007 struck Chile and Japan.