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Tectonic Mechanism of the Suining（Ms5.0） Earthquake,Center of Sichuan Basin,China

ISSN号：1000-0550
期刊名称：《沉积学报》
时间：0
分类：P315.2[天文地球—地震学;天文地球—固体地球物理学;天文地球—地球物理学] P618.130.2[天文地球—矿床学;天文地球—地质学]
作者机构：[1]Earthquake Administration of Sichuan Province, Chengdu 610041, China, [2]National Key Laboratory of Oil and Gas Reservoir Geologyand Exploitation, Chengdu University of Technology, Chengdu 610059, China, [3]Royal Roads University, School of Peace and Confliict Management, Victoria, B.C., Canada, [4]China University ofGeoscience, Beijing 100083, China, [5]Earthquake Administration of Chongqing Municipality, Chongqing 401147, China
相关基金：the National Natural Science Foundation of China （Grant No. 40841010,40972083,41172162）;the National Science and Technology Support Program （Grant nNo. 2006BAC13B02-107,2006BAC13B01-604） for the funding

作者： ZHOU Rong-jun[1], LI Yong[2], Laurence SVIRCHEV[3], ZHANG Yong-jiu[1], HE Deng-fa[4], HE Yu-lin[1], ZHAO Pei-lin[5], WANG Zan-jun[5], LONG Feng[1], SU Jin-rong[1], WANG Shi-yuan[1], LIANG Ming-jian[1], LIU Yu-fa[1], KANG Chuan-chuan[1]

关键词：地震发生, 四川盆地, 构造机制, 遂宁市, 中国, 震源机制解, 历史地震活动, 大地构造环境, Suining（Ms5.0） earthquake Disaster Tectonic mechanism Horizontal crustal shortening Backthrust fault Shallow detachment Sichuan Basin

中文摘要：

在 1 月 31 日 2010， Suining 地震发生在 Suining 城市 whch 被定位四川的中心盆。强烈地震与稳定的大地构造的环境和低级历史的 seismicity 发生在四川盆的中心是不平常的。地震的宏震中在 Suining 城市的 Moxi 镇被定位，四川省，中国。震中区域的地震紧张是度 VII，和在 NE 取向的等震的线趋势的长轴。Suining 地震引起了 460 幢家庭房子的倒塌或破坏。近地的地震仪的车站的焦点的机制答案和记录显示出的地震地震在深度发生在反向的差错 34 km。基于波形和焦点的机制，我们认为 Suning 地震被反向的差错并且不由重力的倒塌触发或人造爆炸来源。基于地震折射侧面和地上凿穿，我们认为地震被在分队生根的 Moxi 背斜的 backthrust 差错在深度触发 34 km.Furthermore ，我们推断 Suining ( Ms5.0 )地震的那构造机制被驾驶由在 Wenchuan (女士 8.0 )以后的在一个浅分队上的水平外壳的弄短和压力调整地震。

英文摘要：

On Jan.31 of 2010,the Suining earthquake occurred at Suining City whch is located the center of Sichuan Basin.It is unusual for the strong earthquake to occur at the center of Sichuan Basin with a stable geotectonic environment and a low-level historical seismicity.The macro-epicenter of the earthquake is located at Moxi town of Suining city,Sichuan province,China.The earthquake intensity of the epicenter area is degree VII,and the long axis of the isoseismal line trends in NE orientation.The Suining earthquake caused the collapse or destruction of 460 family houses.The earthquake focal mechanism solution and records of the near-field seismographic stations showed the earthquake occurred at the reverse fault at a depth 34 km.Based on the waveform and focal mechanism,we consider the Suning earthquake is triggered by the reverse fault and not by the gravitational collapse or man-made explosive sources.Basing on seismic refraction profile and borehole,we consider that the earthquake is triggered by the backthrust fault of Moxi anticline rooted in detachments at a depth 3-4 km.Furthermore,we infer that tectonic mechanism of the Suining（Ms5.0） Earthquake is driven by the horizontal crustal shortening and stress adjustment on a shallow detachment after the Wenchuan（Ms 8.0） earthquake.

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