青海大柴旦地方震波形特征分析  

Analysis on waveform characteristics of local earthquakes of Dachaidan in Qinghai Province

作　　者：李启雷[1] 李玉丽[1] 罗自浩 马丽 Li Qilei1;LI Yuli;LUO Zhihao;MA Li(Qinghai Earthquake Agency,Xining 810001,China;HuangyuanSismic Station, Qinghai Province 812100, China)

机构地区：[1]青海省地震局,中国西宁810001 [2]湟源地震台,中国青海812100

出　　处：《地震地磁观测与研究》2018年第1期36-40,共5页Seismological and Geomagnetic Observation and Research

基　　金：青海省地震科学基金(课题编号:2017A07)

摘　　要：利用双差定位法对2009—2015年大柴旦M 0.5以上地震重新进行精确定位,并绘制区域地震震源深度频数直方图。根据地震精定位结果,选取地震波形记录较好的事件进行特征分析。结果发现,重新定位后,大柴旦地区约65%的地震震源深度分布在6—10 km,震源深度较浅,地震波列衰减快,经过滤波,在直达波后观测到新的震相,初步推测为康拉德界面反射波。The earthquakes over M0.5in Dachaidan region of Qinghai Province between2009and2015were relocated by double-difference location method,and the focal depth distribution of regional earthquakes was showed by frequency histogram.Then,according to the double-difference relocation results,the well-record seismic events over M3.0of focal depth with high probability in the area are selected as typical examples to analyze the waveform characteristics of local earthquakes.The result shows that,after relocation,the focal depths of about65%earthquakes in Dachaidan area are distributed in the range of6-10km.The focal depths are shallow and the attenuation of wave trains is fast.The new seismic phase arriving after the direct wave can be preliminarily deduced as reflection wave from the Conrad surface.

关 键 词：大柴旦 双差定位法 地方震 震源深度 

分 类 号：P315.31[天文地球—地震学]