岫岩地震序列视应力变化及其预测意义

Change of apparent stress of Xiuyan earthquake sequence and its prediction significance

选取辽宁省地震局沈阳数字化地震台网中的岫岩、营口、本溪、北镇、新民5个台的波形记录, 计算了1999年11月29日岫岩MS5.4地震序列视应力值。5 个台资料的计算结果具有很好的一致性, 即岫岩序列的视应力变化特征具有显著的共性特征: 震前低视应力阶段、震时高视应力阶段和震后逐渐降低的调整至稳定阶段, MS5.4 主震和5.1 级最大强余震前视应力升高, 表明视应力可作为中强震及震后地震趋势预测的判定依据。

the authors use waveform records of 5 stations of Xiuyan, Yingkou, Benxi, Beizhen and Xinmin from digital seismic station network of Shenyang, Earthquake Administration of Liaoning Province, to calculate apparent stress of Xiuyan sequence of M_S5.4 earthquake occurred on Nov. 29, 1999. The calculated results from the five stations are well consistent, and change of apparent stress of Xiuyan sequence has notable common feature, i.e. low apparent stress phase before earthquake, high apparent stress phase while earthquake occurrence and adjusting and stable phase after earthquake, during this phase, the stress reduced gradually. That apparent stress increase before the M_S5.4 mainshock and maximum strong aftershocks of M_S5.1 show that apparent stress could be regarded as criterion of earthquake tendency before and after moderately strong earthquakes.