It has been found that the upper bound of the focal fault is the G interface obtained by seismic sounding data and is consistent with the high-dip angle deep fault beneath the interface, which proved that the deep fault underwent a shers disturbance during the earthquake. 发现震源断层的上界即为由地震测深资料得到的G界面,并与该界面之下的高倾角深断裂吻合,证明地震时深断裂发生了剪切错动。