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2011年1月19日安庆M_L4.8地震的震源机制解和深度研究
引用本文:谢祖军,郑勇,倪四道,熊熊,王行舟,张炳.2011年1月19日安庆M_L4.8地震的震源机制解和深度研究[J].地球物理学报,2012,55(5):1624-1634.
作者姓名:谢祖军  郑勇  倪四道  熊熊  王行舟  张炳
作者单位:1. 大地测量与地球动力学国家重点实验室,中国科学院测量与地球物理研究所,武汉430077;中国科学院研究生院,北京100049
2. 大地测量与地球动力学国家重点实验室,中国科学院测量与地球物理研究所,武汉430077
3. 安徽省地震局,合肥,230031
基金项目:地震行业科研专项重大项目,中国科学院知识创新工程重要方向项目,国家自然科学基金
摘    要:2011年1月19日在安徽省安庆市辖区与怀宁县交界处发生了ML4.8级地震,引起安庆市及周边地区强烈的震感.为了更好地认识这次地震的发震构造,我们利用安徽省及临近几个省份区域台网的近震波形资料,首先通过hypo2000绝对定位得到震中位置;然后采用CAP方法反演了该地震的震源机制解和震源深度,并在此基础上结合P、sP、pP和sPmP等深度震相对震源深度进行了精确确定;最后,将反演得到的结果作为已知输入,利用F-K方法计算理论地震图,并与观测记录进行对比,以验证结果的可靠性.反演结果显示,这次安庆地震是一个带少量走滑分量的逆冲型地震,地震矩震级为MW=4.3,最佳双力偶解为节面Ⅰ走向131°,倾角30°,滑动角29°;节面Ⅱ走向15°,倾角75°,滑动角116°,最佳震源深度为4~5km,属于浅源地震.从震中和震源机制解来看,安庆地震极有可能发生在宿松-枞阳断裂上.

关 键 词:安庆地震  震源机制解  震源深度  CAP方法  深度震相

Focal mechanism and focal depth of the 19 January 2011 Anqing earthquake
XIE Zu-Jun , ZHENG Yong , NI Si-Dao , XIONG Xiong , WANG Xing-Zhou , ZHANG Bing.Focal mechanism and focal depth of the 19 January 2011 Anqing earthquake[J].Chinese Journal of Geophysics,2012,55(5):1624-1634.
Authors:XIE Zu-Jun  ZHENG Yong  NI Si-Dao  XIONG Xiong  WANG Xing-Zhou  ZHANG Bing
Institution:1 State Key Laboratory of Geodesy and Earth’s Dynamics,Institute of Geodesy and Geophysics,Chinese Academy of Sciences, Wuhan 430077,China 2 Graduate University of Chinese Academy of Sciences,Beijing 100049,China 3 Anhui Seismic Bureau,Hefei 230031,China
Abstract:On January 19,2011,a magnitude ML4.8 earthquake occurred in the region between Anqing and Huaining in Anhui province,which is a relatively strong earthquake and can be felt in Anqing and surrounding areas.To better understand the seismotectonics of this event,we try to relocate it and further study its focal mechanism based on the local broadband waveform data of available stations in Anhui and adjacent province regional seismic networks.In this work,the earthquake was relocated with absolute relocating method Hypo2000 at first,and then the focal mechanism and focal depth were determined by the "Cut and Paste"(CAP) method.In order to better constrain the focal depth,we further refined it with depth phases such as P,sP,pP and sPmP.Finally,the results of focal mechanism and focal depth were confirmed by comparing the observed records and the synthetic waveforms which were computed by F-K method.The results indicate that the Anqing earthquake is a thrust event with a small part of strike-slip component.The best double couple solution is 131°,30° and 29° for strike,dip and slip angles respectively for one nodal plane,and 15°,75° and 116° for another.The moment magnitude is 4.3,and the estimated focal depth is 4~5 km,which suggests that this event is a shallow earthquake and capable of heavy hazard to the surrounding areas.According to the epicenter and the focal mechanism,Anqing earthquake likely occurred on the Susong-Zongyang Fault.
Keywords:Anqing earthquake  Focal mechanism  Focal depth  CAP method  Depth phase
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