The 1 October 1995 Dinar earthquake, SW Turkey |
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| Authors: | Haluk Eyidoan Aykut Barka |
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| Institution: | ITÜ, Maden Fakültesi, Jeofizik Mühendisli i Bölümü, 80626, Ayazaa, Istanbul, Turkey;ITÜ, Maden Fakültcsi, Jeoloji Mühendislii Bölümü, 80626, Ayazaa, Istanbul, Turkey |
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| Abstract: | The Dinar earthquake (Ms= 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 mainshock was preceded by a series of foreshocks that started 6 days before the mainshock and included two Md = 4.5 events. The mainshock source mechanism derived from the inversion of broad-band P waves revealed 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 seismic moment found from the inversion of P waveforms is 2.0 times 10 18 Nm. The seismic moment of the second sub-event was about four times larger than the first one. Field observations, GPS measurements and slip vector obtained from the inversion of broad-band P waveforms suggest that the NW-SE trending Dinar Fault is due to the internal deformation of SW Anatolia moving south-westwards. |
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