山西地区Pb震相记录特征研究  

Study on the Characteristics of Pb Seismic Phase Records in Shanxi Province

作　　者：张蕙[1,2] 梁向军[1,2] ZHANG Hui;LIANG Xiang-jun(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3期1-3,共3页Earthquake Research in Shanxi

基　　金：山西省地震局科研项目(SBK-2034)。

摘　　要：通过识别山西测震台网2016-2018年记录到的ML≥2.5地震事件波形Pb震相,获得山西地区不同震中距Pb震相的记录特征:山西地区Pb震相作为初至震相出现的最小震中距约80 km左右,记录形态类似于正弦波,波形特征和Pn波相似,振幅比Pg波小,周期比Pg波大;Pb震相作为后续震相出现,一般呈锯齿状,处于Pn与Pg震相之间,周期较Pn与Pg波小,振幅稍大于Pn波,小于Pg波。通过识别Pb震相,采用在不同震中距范围内实测数据进行线性拟合的方法,得到其传播速度为6.815 km/s。By identifying Pb phase of ML≥2.5 seismic event waveform recorded by Shanxi seismic network from 2016 to 2018,the recording characteristics of Pb phase with different epicentral distance in Shanxi area are obtained:the minimum epicenter distance of Pb phase as the first arrival phase is about 80km,the recording form is similar to sine wave,the waveform characteristics are similar to Pn wave,the amplitude is smaller than Pg wave,and the period is larger than Pg wave;Pb phase appears as a follow-up seismic phase,generally in zigzag shape,between Pn phase and Pg phase.The period of Pb phase is smaller than Pn and Pg wave,and the amplitude is slightly larger than Pn wave,but smaller than Pg wave.Based on the identification of Pb phase and linear fitting of measured data in different epicentral distances,the propagation velocity is 6.815km/s.

关 键 词：波速 山西地区 Pb震相 波形特征 

分 类 号：P315.73[天文地球—地震学]