Ebrahim Haghshenas - International Institute of Earthquake Engineering and Seismology (IIEES) ۲۶ Arghavan St., N. Dibaji, Farmanieh, Tehran, I. R. Iran,
Mohammad Reza Mahdavifar - International Institute of Earthquake Engineering and Seismology (IIEES) ۲۶ Arghavan St., N. Dibaji, Farmanieh, Tehran, I. R. Iran,
Farzam Yamini-Fard - International Institute of Earthquake Engineering and Seismology (IIEES) ۲۶ Arghavan St., N. Dibaji, Farmanieh, Tehran, I. R. Iran,

Regional geotechnical aspect of the Qeshm earthquake of November 27, 2005 and their effect on earthquake damages are described putting emphasis on the rock-falls and the effects of the surface geology on ground motion. Many small to medium size rock-falls, occurred during this earthquake, were mapped based on field surveys. Further studies show that many slope of the region are susceptible to rock-falls due their special geological and geomorphological setting and can be vastly triggered in case of a stronger earthquake in future. The variation of ground motion, investigated based on a temporary seismological network, installed after earthquake, show that the most of the localities severely damages during Earthquake coincide with the local existence of loose sandy-silty soils specially in the Tomban and Gavarzin villages.