Stochastic Finite Fault Modeling and Simulation of Strong Ground Motion of Mosha Fault in Iran

IF 0.8 Q4 ENGINEERING, CIVIL

Electronic Journal of Structural Engineering Pub Date : 2020-06-01 DOI:10.56748/ejse.20247

H. Saffari, A. Roohafzayan, A. Mahdavian, M. Yari

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Abstract

This study aims at predicting large earthquakes caused by Mosha fault in Tehran, the capital of Iran with population of more than 13 million people which located alongside active faults. This study uses the EXSIM program to do the finite fault modeling of simulation. Using Geopsy software and programming in MATLAB we evaluated the site effect of 13 station. Using other required parameters of Mosha fault in EXSIM, we gained the artificial strong motions of the stations. Finally, using SeismoSignal and MATLAB software, we depicted the Acceleration -time graph and the semi-logarithm frequency spectrum with “Fourier transform” of each station. we compared the results of the finite fault simulation with Ambraseys attenuation relationship, semi-logarithm frequency spectrum with Fourier transform and spectrum-response graphs of 2009 earthquake in Shahr-e Rey measuring Mw = 4.2. In both cases of comparing meaningful results were found. Finally, in order to generalize the results to the city of Tehran, we evaluated the seismicity using Arc GIS software. The results show that if Mosha fault is activated, east of Tehran is influenced the most. Consequently, it is of high importance to study different ways to reduce the risk of the possible earthquake caused by Mosha fault.

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伊朗Mosha断层强震随机有限断层建模与模拟

这项研究旨在预测伊朗首都德黑兰莫沙断层引起的大地震。德黑兰人口超过1300万，位于活动断层旁。本研究使用EXSIM程序进行有限元故障建模仿真。利用Geopsy软件和MATLAB编程，对13站的场地效应进行了评价。利用EXSIM中Mosha断层所需的其他参数，得到了台站的人工强运动。最后，利用SeismSignal和MATLAB软件，绘制了各台站的加速度-时间图和用“傅立叶变换”得到的半对数频谱。我们将有限断层模拟的结果与Ambraseys衰减关系、傅立叶变换的半对数频谱以及2009年Shahr-e Rey地震Mw=4.2的频谱响应图进行了比较。在两种比较情况下都发现了有意义的结果。最后，为了将结果推广到德黑兰市，我们使用Arc GIS软件对地震活动性进行了评估。结果表明，如果Mosha断层被激活，德黑兰东部受影响最大。因此，研究不同的方法来降低莫沙断层可能引发地震的风险具有重要意义。

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来源期刊

Electronic Journal of Structural Engineering Engineering-Civil and Structural Engineering

CiteScore

1.10

自引率

16.70%

发文量

期刊介绍： The Electronic Journal of Structural Engineering (EJSE) is an international forum for the dissemination and discussion of leading edge research and practical applications in Structural Engineering. It comprises peer-reviewed technical papers, discussions and comments, and also news about conferences, workshops etc. in Structural Engineering. Original papers are invited from individuals involved in the field of structural engineering and construction. The areas of special interests include the following, but are not limited to: Analytical and design methods Bridges and High-rise Buildings Case studies and failure investigation Innovations in design and new technology New Construction Materials Performance of Structures Prefabrication Technology Repairs, Strengthening, and Maintenance Stability and Scaffolding Engineering Soil-structure interaction Standards and Codes of Practice Structural and solid mechanics Structural Safety and Reliability Testing Technologies Vibration, impact and structural dynamics Wind and earthquake engineering. EJSE is seeking original papers (research or state-of the art reviews) of the highest quality for consideration for publication. The papers will be published within 3 to 6 months. The papers are expected to make a significant contribution to the research and development activities of the academic and professional engineering community.