【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。更多还原

【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.更多还原