engineering seismological aspects of the andeka earthquake of 25 september 2002, mw5.6 with special reference to the masjed-soleyman dam site

the andeka earthquake of 25/09/2002 (mw = 5.6) shocked the northeast region of the city of masjed-soleyman in zagros folded belt. the event caused no life loss but 4 people were reported to be injured. the quake occurred in the southern parts of the zagros belt in an oil-rich area. no damage could be observed in the masjed-soleyman dam site, which is the most important hydroelectric infrastructure in the region. the region is visited and the most important damages of the earthquakes in the macroseismic region is surveyed and presented in this paper. the records of the mainshock and the aftershocks in the dam station were processed based on the estimation of the signal to noise ratio and the and a pga of 360 cm/sec2 was found for the mainshock in the dam site, at about 10km distant to epicenter.