利用CAP方法反演了2010年4月4日大同-阳高4.6地震震源机制解。反演得到地震的震级、方位角、倾角和滑移角，结果表明：此次地震为正断兼有斜滑活动。结合序列精定位平面长轴展布方向、大同阳高6.1级地震老震区断裂展布，认为节面II的走向、倾向及其正断走滑特性与震中附近的六楞山山前断裂吻合，其为发震断裂的可能性较大。

Focal mechanism solution of the Apr.4, 2010 Datong –Yanggao earthquake of M 4.6 is inverted by the method of Cap. Mw=4.5,nodal plane is 89°, 39°and -56°for strike, dip and rake angles respectively; for strike, dip and rake angles respectively; The other nodal plane is 228°, 58°,-114°; The estimated focal depth is about 10km,for normal with oblique slippery activity. Combined long axis direction of plane of extract position for sequence and fault of the old earthquake zone of the Datong-yanggao earthquake of M6.1, it is considered that the Strike, dip and normal with strike-slip characteristic of the nodal plane II inosculate the Liulengshan fault near the epicenter, which is probably the fault generating earthquake.