Tsunami event Sedimentology evidence in Makran coasts, Balouchestan

Tsunami study as one of the most serious forms of coastal hazards, is favored by many engineers, planners and politicians. Depositional effects of the tsunami subdivided to sedimentary and geomorphic landforms. This article is about the sedimentation processes associated with tsunami inundation in the northern coast of Oman Sea (Makran). Tsunami inundation features of flooding are very diverse. At first, this paper presents a conceptual model of coastal tsunami sedimentation processes deduced from the case studies and outlines diagnostic features of tsunami deposits and then reviews the presence or absence of these features in a storm deposits. Random pits drilled in some of the water entries on the northern coast of Oman from Chabahar to Beris and the sedimentological sequence is investigated in them. Experiments such as granuluometry by wet and dry sieve, hydrometry, calcimetry, and X-ray Diffraction (to recognizing minerals) done. Some pits shows finning upward sequences, Rip Rap structure, shell fracture accumulation, and sudden change in sediment. According to the observed sedimentary structures, sorting, tilt, percentage of calcium carbonate and terrigenous debris, possible deposit of tsunami are detected. The aim of this study has also been to evaluate the ability of sedimentology in detecting evidence of tsunami sediment off the coast of Makran.