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用CAP方法研究安庆4.8级地震震源机制
洪德全,王行舟,韩立波,戚浩,张炳
1.安徽省地震局;2.蒙城国家野外观测研究站;3.中国地震局地球物理研究所
摘要:
利用CAP方法反演了2011年1月19日安庆MS 4.8地震震源机制解。反演得到震级MW=4.1,节面I走向角16°、倾角74°、滑移角120°; 节面II走向131°,倾角33°,滑移角30°; 震源深度为3km。两个节面的走向与震中附近的宿松-枞阳断裂的走向相差较大,加之前人的地质考察结果显示,该断裂晚第四纪以来地震活动性较弱,故认为宿松-枞阳断裂是安庆MS 4.8地震发震构造的可能性较小,本次地震很可能是北北东向的隐伏断层活动的结果。
关键词:  安庆地震  CAP方法  震源机制解
DOI:
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基金项目:中国地震局地震预报司震情跟踪工作任务(2011020104)资助
Source mechanism of the 2011 MS4. 8 Anqing earthquake determined from CAP method
Hong Dequan1,2)1, Wang Xingzhou1,2)2, Han Libo3)3, Qi Hao1)4, Zhang Bing1)5
1) Earthquake Administration of Anhui Province,Hefei,230031,China / 2) National Geophysical Observatory at Mengcheng,Hefei 230026,China;2.1) Earthquake Administration of Anhui Province,Hefei,230031,China / 2) National Geophysical Observatory at Mengcheng,Hefei 230027,China;3) Institute of Geophyiscs,China Earthquake Administration,Bejing 100081,China;4.1) Earthquake Administration of Anhui Province,Hefei,230031,China;5.1) Earthquake Administration of Anhui Province,Hefei,230032,China
Abstract:
In this article,we have inverted local broadband waveform data to determine the foca1 mechanism of 2011 Anqing MS4. 8 earthquake. Our result shows that the best double couple solution of the MS4. 8 event is 16°,74° and 120° for strike,dip and rake angles respectively. The other nodal plane is 131°,33°,30°;the estimated focal depth is about 3km. The both strikes of the two nodal plane are significantly different with the strike of the Susong-Zongyang fault,which has a low level of seismic activity since Late Quaternary. This implies that this earthquake may not occur on the Susong-Zongyang fault,and we infer that a buried fault with strike of NNE may be the seismogenic structure of this event.
Key words:  Anqing earthquake Cut and paste method Source mechanism