Seismic vulnerability hazard assessment of south coastal on the Caspian Sea

Subject Areas :

همایون KHoshravan ¹ (عضو هیئت علمی مرکز ملی مطالعات و تحقیقات دریای خزر)
جواد Malek ² (عضو هیئت علمی موسسه تحقیقات آب، وزارت نیرو)
حامد Barimani ³ (دانشجوی دکتری رشته عمران، خاک و پی، دانشگاه ایروان، ارمنستان)
احمد Hashemi ⁴ (کارشناس پژوهشی پژوهشگاه بین المللی زلزله شناسی و مهندسی زلزله)

Received: 2016-09-05 Accepted : 2016-09-05 Published : 2009-06-22

Keywords: Earthquake, GIS, Caspian Sea, Instability,

Abstract :

This research has directed to gain the seismic instability hazard assessment in the southern coastalprovinces of the Caspian Sea as main target. Main active faults have been recognized by correlationthe seismic source points with faults location map. Mazandaran great fault, Alborz, Lahijan, Badeleh,Lavij and Astara was known as the most active faults during the Quaternary period. High vulnerablearea has been distinguished by applying seismic occurrence probability with magnitude more than 5Richter. Then geotechnical hazard degree has been evaluated by overlapping the other informationlayers such as: topography, slope and its direction, sediments composition, precipitation amount, roadsand construction, land use and water table condition in the universal ranking model in the geographicalinformation system. Data results as GIS maps show that the seismic hazard risk is relatively highgrade at near the main faults (Mazandaran great fault, Astara and Lahijan faults). The occurrenceprobability of land slide is concentrated near the centre part of the southern coasts of the Caspian Sea(Noor- Neka) and along the Gorgan plain with lose sediment.Other geotechnical hazard events suchas: liquefaction and settlement are dominated along the east part and west part of the study area(Amirabad- Babolsar, Talesh, and Astara) with high concentration of sand sediment near the beachand rivers mouth.