Compressive faults occurred after principalearthquake with slow variation in propagation and release of stress wave, this might lead to higher after shock intensity and longer duration.
挤压型逆冲断层地震在主震之后，应力传播和释放过程比较缓慢，可能导致余震强度较大，持续时间较长。
2
In this paper, using principal component method 115 strong-motion earthquake records are analysed.
本文运用主成份法对115个强地震运动资料进行了分析。
3
This paper describes the transducer of the resistance strain gauge, the formulas for its principal stress and the application of the earthquake prediction.