山西代县及左云地区爆破、塌陷波形特征对比分析  

Comparative Analysis of the Wave Characteristics of Blasting and Collapse in Daixian and Zuoyun Areas of Shanxi Province

作　　者：梁永烨 张玲[1,2] LIANG Yong-ye;ZHANG Ling(Shanxi Earthquake Agency, Taiyuan, Shanxi 030021, China;National Continental Rift Valley Dynamics Observatory of Taiyuan, Taiyuan, Shanxi 030025, China)

机构地区：[1]山西省地震局,山西太原030021 [2]太原大陆裂谷动力学国家野外科学观测研究站,山西太原030025

出　　处：《山西地震》2020年第2期10-14,共5页Earthquake Research in Shanxi

基　　金：山西省地震局科研项目(SBK-1901)。

摘　　要：山西代县和左云地区为爆破和塌陷多发区,快速判定两地发生事件的类型,有利于提升台网地震速报及编目质量水平。选取2009年以来山西台网记录到的山西代县和左云地区ML≥2.5的爆破和塌陷地震事件目录,并对所选事件的体波和面波形态、P波初动方向、AS/AP振幅比、幅频特性等进行对比分析。结果表明,代县地区塌陷波的面波出现更早,周期更大,能量衰减更快;该地区爆破事件初动向上的近台所占比例大于50%,左云地区则小于50%。左云地区爆破的AS/AP值随震中距增大呈现缓慢增长趋势,代县地区则基本保持不变;两地爆破和塌陷的波形主频多集中在0~1.5 Hz频段,塌陷的高频衰减较爆破更快。Daixian and Zuoyun areas in Shanxi Province are prone to blasting and collapse.It is beneficial to improve the quality of seismic quick report and cataloguing by quickly determining the types of events in the two areas.The blasting and collapse earthquake event catalogue with ML≥2.5 in Daixian and Zuoyun areas of Shanxi recorded by Shanxi network since 2009 is selected,and the shape of body wave and surface wave,the initial motion direction of P wave,AS/AP amplitude ratio and amplitude frequency characteristics of the selected event are compared and analyzed.The results show that the surface wave of collapse wave in Daixian area appears earlier,its period is larger,and its energy attenuation is faster;the proportion of near stations in the initial trend of blasting events in this area is more than 50%,while that in Zuoyun area is less than 50%;the AS/AP value of blasting in Zuoyun area increases slowly with the increase of epicenter distance,while that in Daixian area is basically unchanged;the dominant frequency of blasting and collapse waves in the two places is mostly concentrated at 0~1.5 Hz band,but the high frequency attenuation of collapse is faster than that of blasting.

关 键 词：爆破 塌陷 P波初动 幅频特性 

分 类 号：P315.63[天文地球—地震学]