岫岩5.4和5.1级地震前波谱异常特征研究  

Characteristics of wave spectrum anomaly before M_S5.4 and 5.1 of Xiuyan earthquakes

作　　者：张萍[1] 王安东[1] 

机构地区：[1]辽宁省地震局,辽宁沈阳110031

出　　处：《地震》2006年第1期57-65,共9页Earthquake

基　　金：辽宁省地震局科研项目(2005-K-14)

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。By using more than 360 digital wave data of 52 earthquakes recorded by Liaoning Digital Seismological Network between November 11th 1999 and January 10th 2000, we use the PISA software to study the corner frequency ratio of 27 foreshocks before the Ms5, 4 and 25 aftershocks before the MsS. 1 （the largest aftershocks after the main one）. The result shows that before the MsS. 4 and MsS. 1 of Xiuyan earthquakes, the corner frequency ratio fcp/fcs 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.

关 键 词：地震波谱 拐角频率比 前震 数字台网 

分 类 号：P315.7[天文地球—地震学]