Alireza Alinaghi - Assistant Professor, Dept. of Seismology, International Institute of Earthquake Engineering and Seismology, Tehran, Iran

Regional moment tensor inversion of two series of earthquakes in and around Qeshm Island in the Persian Gulf has been carried out using high quality broadband data from Iran national seismic network (INSN). The events which have been recorded at regional distances by stations of INSN have started to jolt the Island and the mainland Iran in two sequences starting in November 2005 with a Mw=5.9 event and continuing with another series of events in March 2006. We present the results of our analysis of the main shock and three aftershocks from the two above mentioned earthquake series. From the focal mechanism solutions it appears that a mainly south-north trending compressional axis prevails. Apart from a major aftershock in the first earthquake series which shows mainly strike-slip mechanism with normal component of slip, the main shock and the the other two aftershocks show large component of reverse faulting along causative faults trending NEE-SWW to SE-NW. The horizontal components of main compressional axes deduced from our solutions suggest mainly south-north directions which are in accordance with the expected axes of shortening in the region.