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Evaluation of Slip Rate on astara fault system, North Iran

Journal of Earth Science 2016年第6期27卷 971-980页

作者： Amir Barzegari Rasoul Esmaeili Mohammad Ebrahimi Ali Faghih Manucher Ghorashi Hamid Nazari Depatment of Geology Faculty of SciencesIslamic Azad University North Tehran BranchTehran ***Iran State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China Department of Geology Faculty of SciencesUniversity of ZanjanZanjan ***Iran Department of Earth Sciences College of SciencesShiraz UniversityShiraz 71454Iran Geological Survey of Iran Tehran 131851494Iran Research Institute for Earth Sciences Geological Survey of lranTehran 131851494Iran

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.

关键词： astara fault system intermediate slip rate geodetic slip rate empirical slip rate Gutenberg-Richter method focal depth.

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Paleoseismological Analysis Along the astara fault system(Talesh Mountain, North Iran)

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Acta Geologica Sinica(English Edition) 2017年第5期91卷 1553-1572页

作者： Amir BARZEGARI Manouchehr GHORASHI Hamid NAZARI Michel FONTUGNE Mohammad A. SHOKRI Mohsen POURKERMANI Department of geology North Tehran Branch Islamic Azad University Tehran Iran Research institute for earth sciences geological survey of Iran PO Box 13185 1494 Tehran Iran Center des Faibles Radioactivites (CNRS-CEA) Avenue de la Terrasse.F.91198 Gif-sur-Ycette CedexFrance Geologicalsurvey of Iran PO Box 13185 1494 Tehran Iran

The astara fault system（AFS） is located in the northwest Alborz, east of Talesh Mountain（TM） and west of the South Caspian Basin（SCB）. The AFS is one of the basement rock faults in Iran that is heavily involved in seismotectonic activity of the Talesh region, and to which subsidence of the SCB is attributed. There is little information available concerning previous AFS seismic activities and its properties. In order to elucidate the seismic behavior and activities of the AFS, we conducted a research study on paleoseismology of the fault. Based on paleoseismic evidence, two scenarios could be taken into consideration, one of which has three and another has four seismic events with magnitudes Mw in the range of 6.7 to 7.2. Evidence of these seismic events is within sedimentary succession as they have occurred during the past 3 ka（this age is determined based on the deposition rate of the region）. Six carbon samples were taken for C^14 age determination tests, the results of which clearly demonstrated that the EvIV（scenario A） and EvⅢ（scenario B） had occurred before 27,444 cal BP, while other events occurred in the time period between 27,444 cal BP and 3 ka ago. If we consider the occurrence of three or four seismic events（based on the two scenarios） to be between 27,444 cal BP and 3 ka ago, the average recurrence interval is 7,119 ± 1,017, but evidence for these events has been removed. If we assume EvI to be the youngest event（in both scenarios）, the minimum elapsed time is therefore 3 ka.

关键词： Paleoseismology morphotectonic active fault astara fault system Iran

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