【摘要】 使用辽宁数字地震台网1999年11月9日至2000年1月10日记录的52次地震共360余条数字化波形事件,采用PITSA软件,对发生在岫岩5.4级地震的27个前震和5.4级地震后的5.1级地震(最大余震)前25个余震的纵、横波拐角频率比值fcp/fcs进行了研究。结果表明:在岫岩5.4级和5.1级地震前的纵波和横波拐角频率比值fcp/fcs,在2次较大地震前均出现较明显的下降异常,此异常可作为今后地震预测可能的参考与临震判断的依据。更多还原

【Abstract】 By using more than 360 digital wave data of 52 earthquakes recorded by Liaoning Digital Seismological Network between November 11th 1999 and January 10^th 2000,we use the PISA software to study the corner frequency ratio of 27 foreshocks before the M_S5.4 and 25 aftershocks before the M_S5.1（the largest aftershocks after the main one）.The result shows that before the M_S5.4 and M_S5.1 of Xiuyan earthquakes,the corner frequency ratio f_cp/f_cs of longitudinal wave and transverse wave all have obvious dropping anomaly before the 2 fairly large earthquakes.This anomaly will be the reference of future earthquake forecast and the basis of foreshock judgment.更多还原