2016年青海门源6.4级地震前后波速比变化研究  

Research on Variation of Wave Velocity Ratio before and after Qinghai Menyuan M_S6.4 Earthquake in 2016

作　　者：刘文邦[1] 万玉杰[1] 李玮杰[1] 

机构地区：[1]青海省地震局,青海西宁810001

出　　处：《地震研究》2016年第S1期49-54,133,共7页Journal of Seismological Research

基　　金：青海省地震科学基金课题(2015A04)资助

摘　　要：基于青海地震台网2009年1月至2016年4月产出的震相观测报告数据,利用多台和达法和单台法对2016年门源6.4级地震前后震源周边地区波速比变化特征进行了研究。结果显示:多台和达法计算得到震前一年波速比存在低值变化,但异常不显著;门源单台计算结果发现2014年初至2015年研究区波速比存在低值异常,之后返回平均值,其它台站异常不明显。分析认为:这可能和多台平均将异常减弱以及地震射线路径对震源区的覆盖有关。Based on the observation report of seismic phases recorded by Qinghai Seismic Network from Jan.,2009 to Apr.,2016,we study the variation characteristics of wave velocity ratio before and after the 2016 Menyuan M_S6.4 earthquake by using multi-station method and single station method.The results shows that the wave velocity ratio calculated by the multi station method shows a lowvalue change which was not significant in one year before the earthquake.The wave velocity ratio calculated by the single Menyuan station shows a lowvalue change from the beginning of 2014 to 2015,then returns to the average value,while the ratios of other stations dot's showabnormal change.The reason of the obtained result maybe have the relation with the multi- station average reduced the abnormity and the coverage of the source region by the seismic ray path.

关 键 词：门源6.4级地震 波速比 和达法 单台法 

分 类 号：P315.31[天文地球—地震学]