Abstract: Gediz and its surroundings have been affected by complex block faulting. In addition to E-W trendingfaults, which characterize the general tectonic pattern of the Western Anatolia, WNW-ESE and NB-SW trendinghave also developed.A distinct earthquake belt is present within the region and WNW-ESE trending Gediz and Simav faults, as wellas E-W trending Emet fault are believed to contribute much to the seismicity of the region.