2014年于田M_S7.3地震的疑似障碍体效应  

A Speculative Barrier Effect of Yutian M_S7.3 Earthquake in 2014

作　　者：刘双庆[1] 陈向军[2] 王熠熙[1] 王俊菲[3] 

机构地区：[1]天津市地震局,天津300201 [2]新疆维吾尔自治区地震局,新疆乌鲁木齐830011 [3]江苏省地震局,江苏南京210014

出　　处：《地震研究》2016年第2期295-302,共8页Journal of Seismological Research

基　　金：中国地震局科技星火计划项目(XH14002Y,XY14005Y,XH16006Y);震情跟踪专项(2015010307,20152017)联合资助

摘　　要：利用新疆和田台阵首波Pn段前4 s的高频波动形态,分析了2014年于田MS7.3主震破裂初期几个疑似破裂点的相对位置,给出两种可能的初始破裂点运动学扩展模型。并利用震中距约58 km的于田台站数据进一步对该模型进行阐述。分析结果推测:此次于田大地震,其起始破裂点开始于一个水平各向异性较强的点位,在之后的3 s内破裂过程向各向异性相对较弱的区域发展,且破裂矢量略向南扩展。Depending on the high frequency waveform in forepart 4 s of Pn,which was recorded by Xinjiang Hetian array,we analyzed the relative position of several speculative forepart rupture in the initial period of Yutian M_S7.3 main shock in 2014,and introduced two concessional rupture kinematics models to explain the observation phenomena. Aim to deeply study the feasibility and veracity of these two models,we also used seismic wave recorded by Yutian Station. The following conclusion was given that the first rupture of the Yutian earthquake would start at an intensively horizontal anisotropic position,and then transmitted into much less anisotropic area in the succedent 3 s. The direction of the short rupture process showed a slight southern trend.

关 键 词：和田台阵 PN段 破裂扩展 障碍体 

分 类 号：P315.72[天文地球—地震学]