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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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Earthquake Source, Path and Site Effects

Earthquake Source, Path and Site Effects

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第四届世界华人地质科学研讨会

作者： Shengzao Chen Geomatrix Consultants Inc. 2101 Webster St 12th FL Oakland CA94612 USA

＜正＞Source radiation, path anelastic scattering, and she responses constitute a major component of ground motion seismology. Observed spectra generally reflect the combined effects of the source nucleation, along with whole-path and local attenuation and amplification. To separate source spectra from path and site responses, both of these effects must be removed from Fourier spectra computed from strong motion records. For this purpose, effects of geometrical spreading, anelastic scattering （whole-path） attenuation （1/Q）, and site effects have been extensively studied over different tectonic regions around the world. Attenuation effects include geometric spreading, anelastic attenuation, and near-surface attenuation. There are also crustal amplification effects, which can be significant where mere exists a strong velocity contrast or gradient Among the tectonic regions studied, it is found that source spectra are approximately independent of region, distance, and depth.when path and site effects are properly removed Kappa values vary regionally. The lowest kappa value corresponds to the hard rock sites in a stable intraplate environment （for example, eastern North America）, while generally higher kappa values correspond to the site conditions in active tectonic environments such as Japan, Mexico, British Columbia （western Canada）, California, and Turkey.

关键词： strong ground motion earthquake source seismic-wave propagation attenuation crustal structure focal depth.

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