SEISMICITY IN MEDITERRANEAN SEA AND EVALUATION OF THE STRONG MOTION FOR THE AD 365 CRETE EARTHQUAKE BY THE STOCHASTIC GREEN'S FUNCTION

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  • 統計的グリーン関数を用いたAD 365年クレタ沖地震動の推定

Abstract

 West Asian region is a very active area of a crustal deformation, many historically huge earthquakes have occurred, crustal movement has continued up to today. To investigate the most suitable solution for the crustal movement will contribute greatly to this region's earthquake and tsunami disaster mitigation. Pitazzoli (1986) suggests that traces of upheaval caused by the AD 365 earthquake on the Greek coast in the Holocene shows the event which occured in the period called the Early Byzantine tectonic paroxysm (EBTP) turbulent period from the mid-4th to the mid-6th centuries. Evidence of a 9 m upheaval by the AD 365 earthquake movement was found in a detailed survey and by radiocarbon dates by Pirazzoli et al. (1996), the date of the casualties' were estimated from coins found in a collapsed house by Stiros (2010), and by the ruins of an old harbor that existed, give the proof of the position of the sea surface at that time by the location of the quay wall. The AD365 earthquake occurred near Crete (e.g., Fischer (2007), Shaw et al. (2008), Stiros (2010), Papadimitriou and Karakostas (2008)). This study selected the most reliable parameters, which each researcher defined, and non-uniform distribution in the fault plane, which is based on Papadimitriou et al. (2008). The calculation of the AD365 earthquake's waveform gave an indication of th maximum acceleration by using the stochastic Green's function method with the selected parameters. Thus, an estimation of the damage to masonry structures could be made. The ancient Crete city of Aptra amd Chania were both hit by the AD365 earthquake. Aptera built on out-cropping rock will be 80 % destroyed whereas Chania built on thick sedimentary layers will be completely destroyed. Chania in the north-west of Crete is expected to be high seismic intensity area. Thus, it is necessary to pay attention to the seismic risk at the high densely populated area with thick sedimentary layers.

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