山西大同、朔州地区非天然地震特征与识别  

Characteristics and Identification of Non-natural Earthquakes in Datong and Shuozhou,Shanxi

作　　者：郑亚迪 宋美卿[1,2] ZHENG Ya-di;SONG Mei-qing(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》2022年第1期7-11,共5页Earthquake Research in Shanxi

基　　金：山西省地震局科研项目(SBK-2101)。

摘　　要：通过震相特征、P波初动方向、As/Ap振幅比、频谱等,对山西北部非天然地震的特征及其识别进行研究。结果表明,爆破、塌陷具有相对独特的震相特征,塌陷震相频率单一、面波明显且出现早,爆破震相的P波发育且初动强而尖锐,波列衰减较快,持续时间短;在P波垂直初动方面,震中距100 km范围内,塌陷超过85%的台站初动向下,爆破超过78%的台站初动向上;爆破的S波与P波最大振幅比(As/Ap)小于塌陷;在频率特征方面,爆破的优势频率集中在0~5 Hz,宽于塌陷,主频为1 Hz。塌陷的优势频率集中在0~2 Hz,主频为1 Hz,低频率成分相对简单。This paper studies the characteristics and identification of the non-natural earthquakes in northern Shanxi through the seismic phase characteristics,the initial movement direction of P wave,As/Ap amplitude ratio and frequency spectrum.The results show that blasting and collapse have relatively unique seismic phase characteristics.The frequency of collapse seismic phase is single,the surface wave is obvious and appears early,the P wave of blasting seismic phase is developed,the initial motion is strong and sharp,the wave train attenuation is fast and the duration is short.In terms of vertical initial motion of P wave,within 100 km from the epicenter,the initial motion of stations with more than 85%collapse is downward,and in the initial motion of stations with more than 78%blasting,the maximum amplitude ratio of S wave to P wave As/Ap of blasting is less than that of collapse.In terms of frequency characteristics,the dominant frequency of blasting is concentrated in 0~5 Hz,wider than collapse,and the dominant frequency is 1 Hz.The dominant frequency of collapse is concentrated in 0~2 Hz,and the dominant frequency is 1 Hz.The low-frequency component is relatively simple.

关 键 词：频谱 非天然地震 震相特征 山西北部 

分 类 号：P315.63[天文地球—地震学]