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.
1911 Sarez earthquake
The 1911 Sarez earthquake occurred at 18:41 UTC on 18 February (23:31 local time) in the central Pamir Mountains in the Rushon District of eastern Tajikistan (then part of the Russian Empire). It had an estimated magnitude of 7.4 on the surface wave magnitude scale and a maximum felt intensity of about IX ("Violent") on the Mercalli intensity scale. It triggered a massive landslide, blocking the Murghab River and forming the Usoi Dam, the tallest dam in the world, creating Sarez Lake. The earthquake and related landslides destroyed many buildings and killed about 100 people.