The earthquake (m=5.2)occurred in Shenwo reservoir region in Liaoning Province on Dec.22, 1974. In this paper by analysing its status of the event in the regional seismicity before and after the Haicheng earthpuake (m=7.3), measuring amplitude ratio of P, S waves and half of the period of first p arrivals, it has shown that the action form of tectonic stress and its concentrative level in Shenwo region were unchanged before and after the largest earthpuakes among this seismic sequence and it was after the Haicheng earthquake that great change took place to them. The authors believe while monitoring the temporal spatial variation of seismicity in the extensive area, we should notice that a larger earthquake could occur in the vicinity if the seismological parameters such as amplitude ratio(the action form of tectonic stress)and half of the period of first p arrivals(seismic stress drop and concentrative level of tectonic stress) were unchanged before and after the largest earthquake in a moderate seismic sequence.
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赵振,蒋秀琴.参窝地震对海城大震的预报意义[J].地震工程学报,1985,7(2):8-13. Zhao Zhen, Jiang Xiuqin. PREDICTIVE IMPORTANCE OF THE SHENWO EARTHQUAKE TO THE HAICHENE GREAT EARTHQUAKE[J]. China Earthquake Engineering Journal,1985,7(2):8-13.