Evaluation of Slip Rate on Astara Fault System, North Iran

作     者：Amir Barzegari Rasoul Esmaeili Mohammad Ebrahimi Ali Faghih Manucher Ghorashi Hamid Nazari Amir Barzegari;Rasoul Esmaeili;Mohammad Ebrahimi;Ali Faghih;Manucher Ghorashi;Hamid Nazari;Depatment of Geology,Faculty of Sciences,Islamic Azad University North Tehran Branch;State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences;University of Chinese Academy of Sciences;Department of Geology,Faculty of Sciences,University of Zanjan;Department of Earth Sciences,College of Sciences,Shiraz University;Geological Survey of Iran;Research Institute for Earth Sciences,Geological Survey of Iran

作者机构：Depatment of GeologyFaculty of SciencesIslamic Azad University North Tehran BranchTehran ***Iran State Key Laboratory of Lithospheric EvolutionInstitute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of SciencesBeijing 100049China Department of GeologyFaculty of SciencesUniversity of ZanjanZanjan ***Iran Department of Earth SciencesCollege of SciencesShiraz UniversityShiraz 71454Iran Geological Survey of IranTehran 131851494Iran Research Institute for Earth SciencesGeological Survey of lranTehran 131851494Iran 

出 版 物：《Journal of Earth Science》 (地球科学学刊（英文版）)

年 卷 期：2016年第27卷第6期

页      面：971-980页

核心收录：

学科分类：070801[理学-固体地球物理学] 07[理学] 08[工学] 0708[理学-地球物理学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

主　　题：Astara fault system intermediate slip rate geodetic slip rate empirical slip rate Gutenberg-Richter method focal depth. 

摘      要：Due to its strategic location, the Astara fault system （AFS）, which is located in Iran, has given rise to a number of earthquakes. In spite of its frequent seismic events, limited information is available for AFS. Slip rate is one of the important variables for future scrutiny of seismic risk of this fault system. The main objective of this research is to study slip rates at intermediate and short terms for this fault system using geological, geodetic observations and empirical method. Using the geological data, the intermediate-term horizontal and vertical slip rates for AFS have been determined to be 2.8±0.2 and 0.27±0.03 mm/year, respectively. In addition, the short-term slip rates of the fault, based on the geodetic method （using displacement values of two GPS stations： HASH and DAMO） and assuming attenuation of 60% （to fold the sediment of South Caspian Basin and shortening of Talesh Mountain range）, determined to be 1.23±0.03 and 2.05±0.05 mm/year for the horizontal and vertical slips, respectively. Finally, evaluation of the slip rate using empirical relationship yields 10 mm/year for the entire fault system, which seems rather implausible.