THE 1 OCTOBER 1995 DINAR EARTHQUAKE, SW TURKEY

The Dinar earthquake (M(s) = 6.1, USGS-PDE) of 1 October 1995 occurred on the NWSE-trending Dinar Fault. The earthquake is associated with a 10-km-long surface rupture with predominantly normal faulting. The ma inshock was preceded by a series of foreshocks that started 6 days bef ore the mainshock and included two M(d) = 4.5 events. The mainshock so urce mechanism derived from the inversion of broad-band P waves reveal ed that two sub-events occurred on a NW-SE trending normal fault with a small strike-slip component. According to the source model estimated in this study, the first rupture started at a depth of about 8 km and reached to a depth of about 12 km propagating north-west. The total s eismic moment found from the inversion of P waveforms is 2.0 x 10(18) Nm. The seismic moment of the second subevent was about four times lar ger than the first one. Field observations, GPS measurements and slip vector obtained from the inversion of broad-band P waveforms suggest t hat the NW-SE trending Dinar Fault is due to the internal deformation of SW Anatolia moving southwestwards.