QE498 : Structural and seismic events analysis of the Gourieh region and their relationship with sub-surface structures
Thesis > Central Library of Shahrood University > Geosciences > MSc > 2020
Authors:
Rasool mombeini Salehi [Author], Ramazan Ramazani Oomali[Supervisor], A.Charchi [Advisor]
Abstarct: Goriyeh region is a city in Shoaibiyeh district of Shushtar city in Khuzestan province. The study area is part of the Zagros fold-thrust belt and in the northern part of the Dezful embayment zone and in the Zagros seismotectonic zone. The anticlines of the study area include the anticlines of Shushtar, Goleh Sorkheh, Sardarabad and Shahour. Examination of fractures in the walls of houses during the period of Goryeh seismic regression and their residual analysis shows the predominant seismic trend of northeast-southwest and next time the seismic trend of northwest-southeast. The faults of the region include Shushtar, Sardarabad and Shahour faults. The magnetic lineaments of the region include MGL-1, MGL-2 and MGL-3 with NE-SW trend, and the baxsement fault include UGC-Fault with NW-SE trend and BSF 2 with NE-SW trend. The maximum focal depth is for earthquakes in the east and southeast of the region, and it can be said that seismic laxyers in this part, such as UGC-Fault, have more depth. The seismic parameters of a and b value are 4.55 and -0.76, respectively. MCE10% and DBE64% coefficients were calculated for structures with a shelf -life of 50 years, 6.1 and 4.8 Richter, respectively. The results of estimating the the maximum earthquake magnitudes (Mmax) for faults in the region by a deterministic method, showed that the Mmax due to subsurface fault activity (MGL-2) with a magnitude of 7.3 and secondarily MGL-2 and UGC- FAULT is 7.2 and 7.1 Richter, respectively. baxsed on the results, the Peak ground acceleration (PGA) on the city of Goriyeh by the subsurface fault (UGC F.) is estimated at 0.4 g, and in the second degree, the MGL-3 line and Sardarabad fault at 0.3 g. In fact, it can be said that the stress regime prevailing in the region and the performance of surface faults and subsurface lineaments such as MGL-3 and UGC-FAULT besement fault have an effect on the seismicity of the Gorye region.
Keywords:
#Goriyeh #Sardarabad anticline #Shushtar #seismicity #baxsement fault #Magnetic lineament #Peak ground acceleration (PGA). Keeping place: Central Library of Shahrood University
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