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.
1960 Agadir earthquake
The 1960 Agadir earthquake occurred 29 February at 23:40 Western European Time near the city of Agadir, located in western Morocco on the shore of the Atlantic Ocean. Despite the earthquake's moderate scale magnitude of 5.8, its relatively shallow depth (15.0 km) resulted in strong surface shaking, with a maximum perceived intensity of X ("Extreme") on the Mercalli intensity scale. Between 12,000 and 15,000 people (about a third of the city's population of the time) were killed and another 12,000 injured with at least 35,000 people left homeless, making it the most destructive and deadliest earthquake in Moroccan history. Particularly hard hit were Founti, the Kasbah, Yachech (iḥšaš) and the Talbordjt area. The earthquake's shallow focus, close proximity to the port city of Agadir, and unsatisfactory construction methods were all reasons declared by earthquake engineers and seismologists as to why it was so destructive.