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利用CAP方法反演了2010年6月5日阳曲MS4.6地震震源机制解,得到震级MW为4.5,节面I走向213°、倾角47°、滑动角-161°,节面II走向109°,倾角76°,滑动角-44°,属于倾滑型;精确定位显示震中处于石岭关隆起区,CAP反演和精定位结果推断本次地震的震源深度为17～20km。震源机制解节面参数与震中附近的山根底断裂和系舟山西麓断裂产状存在差异,这两条断裂不是阳曲地震的发震断裂,由于现场野外地质考察未发现地表断裂,不排除本次地震为隐伏断层活动的结果。
Using the CAP method, the focal mechanism solution of the Yangqu MS4.6 earthquake on June 5, 2010 was retrieved and the magnitude MW was 4.5. The I face was 213 °, dip 47 °, slip angle -161 ° and section II 109 °, dip angle of 76 ° and slip angle of -44 °. The precise location shows that the epicenter is located in the Shilingguan uplift area. According to CAP inversion and precise positioning, the focal depth of this earthquake is estimated to be 17-20 km. There are differences between the focal mechanism solution section parameters and the mountain basement faults near the epicenter and the faults originating in the western foot of Zhoushan Mountains. These two faults are not the seismogenic faults of the Yangqu earthquake. Because the surface rupture was not found in the field geological survey, this time Earthquakes are the result of hidden faults.