Aftershocks investigation of 2010 Dec. and 2011 Jan. Rigan earthquakes in the southern Kerman province, SE Iran .

摘要

A doublet of earthquakes with magnitudes of 6.5 and 6.2 in MW scale (Global CMT) on 2010December 20 and 2011 January 27 respectively struck the area that lies between the Nehbandan andJiroft fault systems, southeast of Iran. These earthquakes occurred in correspondence of thesouthwestern termination of the Kahourak right lateral strike slip fault. The focal mechanisms ofboth the mainshocks and the strongest aftershocks processed with first P motion method confirmthe geological observations. They indicate steep dipping coseismic faults for both events, anddominant right lateral and left lateral strike slip motions, if the NE-SW and NW-SE planes areassumed as the active planes for the 2010 and 2011 earthquakes, respectively. A seismogenic zonethickness of 19 km was computed using the relationships between earthquake parameters.