Document Type : Original Research Paper

Authors

1 Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran

2 Iranian National Institute for Oceanography and Atmospheric Science (INIOAS), Tehran, Iran

3 Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Iran

4 .Assistant Professor, Research Institute For Earth Sciences, Geological Survey of Iran,

5 CNRS, ThéMA, Université de Franche-Comté, UMR 6049, MSHE Ledoux, 32 Rue Mégevand, 25030, Besançon, Cedex, France

10.22071/gsj.2023.389392.2070

Abstract

Abstract
Although the second deadliest tsunami in the Indian oceans was triggered in the Makran zone, our knowledge in regard to the number of tsunami events through the Holocene is negligible. In this study the sedimentary environment palaeo-tsunami have reconstructed and identified by Gulf of Oman deep sea cores. Sedimentation trends and effective factors on seabed sediments transportation by tsunami events were identified based on sedimentological parameters, foraminifera shells identification, magnetite susceptibility changes and palaeo-ocean currents reconstruction. The results of this study demonstrated that evidence of sea bed sediments transportation due to the strong earthquake in the Gulf of Oman were different through time and location. The palaeoenvironmental studies and historical tsunami events suggested at least five considerable submarine landslides through last 2500 cal. yr BP. The number of the events have dramatically increased during last thousand years. Rendering to the results and historical data, almost seven strong earthquakes were happened in the studied area that their traces have illustrated in this study. According to the city expansion in the southeast coast of Iran and increases number of earthquake events in the Makran zone adoption management plans in order to decrease probably tsunami damages are required.

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