5.9 magnitude Damghan earthquake, 27 August 2010.
On 27 August 2010, at 19:23:48 (UTC), an earthquake of magnitude 5.9 (IRSC) shaked the southern part of Damghan and around (Semnan province, Iran). About 5 hours later, the main shock was fallowed by an aftershock of magnitude 5 near its focal at: 35.457°N, 54.550°E and depth: 7 km. As can be seen in the figure, maximum intensity of main shock, assessed to be VII based on MSK scale. Main shock destroyed the old and weak buildings over the epicenter area, partially collapsed and cracked weak buildings in near towns and its shake was felt through 250 km far away.
The largest-ever happened earthquake in this area is Qumes earthquake which happed in 22 December, 856 A.D. in magnitude of 7/9 and killed about 200000 people in Damghan, Semnan, Shahrud and Bastam cities.
The main active fault near the recent earthquake is Torud fault which with NE-SW strike and approximately 130 km long, lays about 100 km away in south of Damghan and cuts the quaternary alluvial fans in hillside of Darestan Mountain.
Isoseismal map of 5.9 Magnitude earthquake happened on 27 August, 2010, in southern area of Damghan, Semnan province. Curves show intensity, closed circle shows epicenter location, open circles and pentagrams represent instrumental and historical earthquakes greater than 5.