P/S震相幅值比判据对低震级地震事件的适用性检验  

APPLICABILITY OF P/S AMPLITUDE RATIOS FOR THE DISCRIMINATION OF LOW MAGNITUDE SEISMIC EVENTS

作　　者：潘常周[1] 靳平[1] 王红春[1] 

机构地区：[1]西北核技术研究所,中国西安710613

出　　处：《地震学报》2007年第5期521-528,共8页Acta Seismologica Sinica

基　　金：军控核查技术项目(513310101)资助.

摘　　要：基于中国新疆及中亚地区大量天然地震和地下爆炸,检验了较大震级情况下得到的区域P/S震相幅值比识别判据对低震级地震事件的适用性.分析结果表明,对较大震级地震事件具有较好识别效果的P/S震相幅值比判据对低震级事件同样适用,而且对低震级事件也具有与较大震级事件大致相当的识别效果.据WMQ、BLK、MUL和MAK台的25个识别效果较好的P/S震相幅值比判据统计,大于ML3.5和ML3.5以下地震事件的误识率之差约为2个百分点.Applicability of regional P/S amplitude ratios for the discrimination of low-magnitude seismic events was tested and proved using earthquakes and explosions in Central Asia. Results obtained show that regional P/S amplitude ratios which may discriminate medium or large magnitude events well are also applicable to low magnitude events. Their performances for low magnitude events are almost as good as that for medium or large events. Statistical comparisons based on 25 P/S discriminants from the four seismic stations WMQ, BLK, MUL and MAK showed that the average misclassification rate for lowmagnitude seismic events averagely was only 2 percent higher than that for medium and large magnitude seismic events.

关 键 词：地下爆炸 低震级 识别判据 P/S震相幅值比 

分 类 号：P315.11[天文地球—地震学]