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利用兰州遥测地震台网数字化记录资料对１９９５年７月２２日永登ＭＳ５．８地震的１０次较强余震进行了精确定位，并由余震震源的空间分布图象讨论了该次地震的震源过程。余震震源明显分布在深度不同的呈立体交叉的两个断层面上，而且发震的时间段也具有明显的分组特征。主震震中位于断层立交部位。提出了在北东方向的区域应力场作用下，上地壳内不同层位的介质中可能有相互立体交叉的断层发育，而其立体相交部位附近的异层介质间快速滑动可能是中国西部地区中强地震成因的新观点
The 10 strong aftershocks of the Yongding MS5.8 earthquake on July 22, 1995 were precisely located using the digitized records of Lanzhou Telemetric Seismic Network. The focal distribution of the aftershocks was discussed in terms of the spatial distribution of aftershocks . The aftershocks are obviously distributed on two fault planes with different depths and intersected with each other, and the period of earthquake occurrence also has obvious grouping characteristics. The epicenter of the main shock is located at the fault interchange area. It is proposed that under the action of regional stress field in the northeast direction, there may be faults of different layers in the upper crust which may cross each other and the rapid sliding between different layers in the vicinity of the three-dimensional intersection may be caused by A new view of the causes of strong earthquakes