| Moment tensor inversion and source rupture process of the September 27, 2003 M_S=7.9 earthquake occurred in the border area of China, Russia and Mongolia |
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| 引用本文： | 赵翠萍,陈章立,郑斯华,刘杰. Moment tensor inversion and source rupture process of the September 27, 2003 M_S=7.9 earthquake occurred in the border area of China, Russia and Mongolia[J]. 地震学报(英文版), 2005, 18(3) |
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| 作者姓名： | 赵翠萍 陈章立 郑斯华 刘杰 |
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| 作者单位： | Institute of Geophysics，China Earthquake Administration，Beijing 100081，China，Institute of Earthquake Science，China Earthquake Administration，Beijing 100036，China，Earthquake Administrationof Xinjiang Uygur Autonomous Region，ürümqi830011，China，Institute of Earthquake Science，China Earthquake Administration，Beijing 100036，China，Institute of Earthquake Science，China Earthquake Administration，Beijing 100036，China，Institute of Earthquake Science，China Earthquake Administration，Beijing 100036，China |
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| 基金项目： | The Specialized Funds for National Key Basic Study (G1998040704), the Dual Project of China Earthquake Admini-stration (9691309020301) and National Natural Science Foundation of China (46764010). |
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| 摘 要： | IntroductionOn September 27, 2003, an earthquake of MS=7.9 struck the border area of China, Russia and Mongolia. According to the field investigation from the Earthquake Administration of XinjiangAutonomous Region, the whole northern Tianshan region felt the hit. Buildings and structures within six counties and one city in Altay region, which is total about 0.11×106 km2 area, were damaged to different extent and caused certain economic losses. The epicenter determined by China National …
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Moment tensor inversion and source rupture process of the September 27, 2003 MS=7.9 earthquake occurred in the border area of China, Russia and Mongolia |
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| Zhao Cui-ping,CHEN ZHANG-Li,ZHENG Si-hua,LIU Jie. Moment tensor inversion and source rupture process of the September 27, 2003 MS=7.9 earthquake occurred in the border area of China, Russia and Mongolia[J]. Acta Seismologica Sinica(English Edition), 2005, 18(3) |
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| Authors: | Zhao Cui-ping CHEN ZHANG-Li ZHENG Si-hua LIU Jie |
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| Abstract: | We conducted moment tensor inversion and studied source rupture process for MS=7.9 earthquake occurred in the border area of China, Russia and Mongolia on September 27 2003, by using digital teleseismic P-wave seismograms recorded by long-period seismograph stations of the global seismic network. Considering the aftershock distribution and the tectonic settings around the epicentral area, we propose that the MS=7.9 earthquake occurred on a fault plane with the strike of 127°, the dip of 79° and the rake of 171°. The rupture process inversion result of MS=7.9 earthquake shows that the total rupture duration is about 37 s, the scalar moment tensor is M0=0.97°×1020 N°m. Rupture mainly occurred on the shallow area with 110 km long and 30 km wide, the location in which the rupture initiated is not where the main rupture took place, and the area with slip greater than 0.5 m basically lies within 35 km deep middle-crust under the earth surface. The maximum static slip is 3.6 m. There are two distinct areas with slip larger than 2.0 m. We noticed that when the rupture propagated towards northwest and closed to the area around the MS=7.3 hypocenter, the slip decreased rapidly, which may indicate that the rupture process was stopped by barriers. The consistence of spatial distribution of slip on the fault plane with the distribution of aftershocks also supports that the rupture is a heterogeneous process owing to the presence of barriers. |
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| Keywords: | earthquake occurred in the boundary area of China Russia and Mongolia moment tensor inversion source rupture process barrier |
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