汶川地震断裂带科学深钻附近上地壳S波分裂特征

详细信息    查看官网全文

• 论文作者：郑拓 ; 丁志峰 ; 常利军
• 年：2016
• 作者机构：中国地震局地球物理研究所;
• 会议召开时间：2016-10-15
• 会议录名称：2016中国地球科学联合学术年会论文集（二十七）——专题51：微地震监测与反演
• 语种：中文
• 分类号：P315
• 学会代码：ZGDW
• 会议名称：2016中国地球科学联合学术年会
• 会议地点：中国北京
• 主办单位：中国地球物理学会、中国地震学会、全国岩石学与地球动力学研讨会组委会、中国地质学会构造地质学与地球动力学专业委员会、中国地质学会区域地质与成矿专业委员会
• 学会名称：中国地球物理学会
• 页数：2
• 文件大小：133k
• 原文格式：O
• 会议级别：全国

摘要

<正>地壳介质中遍布大量定向排列的EDA(extensive-dilatancy anisotropy,张性扩容各向异性)微裂隙(Crampin,et al.,1985),在区域主压应力的作用下,地壳岩石中裂隙的定向排列形成了地震各向异性。S波在各向异性介质中传播时,对地壳介质应力场的变化十分敏感,会分裂成一对接近垂直且速度不同的快、慢波,通过S波快波的优势偏振方向可以获得区域内主压应力的方向,从而揭示地壳介质的各向异性特征(Silver,et al.,1991)。S波快波偏振的优势方向与台站下方的水平主压应力方向一

引文

Chang L J,Ding Z F,Wang C Y,2014.Variation of shear wave sphtting in the 2013 Lushan Ms 7.0 earthquake region.Science China:Earth Sciences,57:2045-2052.
    Chen T,Booth D C,Crampin S.1987.Shear-wave polarizations near the North Anatolian fault-Hi.Observations of temporal changes.Geophys J Royal Astron Soc,91:287-311.
    Crampin S,Atkinson B K.1985.Microcracks in the earth's crust.First Break,3(3):16-20.
    Crampin S,Peacock S.2005.A review of shear-wave sphtting in the comphant crack-critical anisotropic Earth.Wave Motion,41:59-77.
    Cochran E S,Vidale J E,Li Y G.2003.Near fault anisotropy following the Hector Mine earthquake.J.Geophys Res,108(B9):2436-2447.
    Gao Y,Wang P D,Zheng S H,et al.1998.Temporal changes in shear-wave sphtting at an isolated swarm of small earthquakes in 1992 nearDongfang,Hainan Island,southern China.Geophys J Int,135(1):102-112.
    Gao Y,Crampin S.2004.Observations of stress relaxation before earthquake.Geophys.J.Int.,157(2):578-582.
    Gao Y,Wu J,FukaoY,et al.2011.Shear-wave splitting in the crust in North China:Stress,faults and tectonic implications.Geophys J Int,187:642-654.
    Gao Y,Shi Y T,Wu J,et al.2012.Shear-wave sphtting in the crust:Regional compressive stress from polarizations of fast shear-waves.Earthquake Sci,25:35-45.
    Liu Y,Crampin S,Main I.1997.Shear-wave anisotropy:spatial and temporal variations in time delays at Parkfield,Central California.Geo-phys J Int,130:771-785.
    Peacock S,Crampin S,Booth D C,et al.1988.Shear-wave splitting in the Anza seismic gap,Southern California:temporal variations as possible precursors.J Geophys Res,93:3339-3356.
    Shih X R,Meyer R P,Schneider J F.An automated,analytical method to determine shear-wave anisotropy.Tectonophysics,1989,165:271-278
    Silver P G,Chan W W.1988.Implication for continental structure and evolution from seismic anisotropy.Nature,335:34-39.
    Silver P G,Chan W W.1991.Shear wave splitting and subcontinental deformation.J Geophys Res,96:16429-16454.
    Volti T,Crampin S.2003.A four-year study of shear-wave sphtting in Iceland:1.Background and preliminary analysis,in New insights into structural interpretation and modeling.Geol Soc Lond Spec Publ,212:117-133.
    常利军,王椿镛,丁志峰等.2008.青藏高原东北缘上地幔各向异性研究.地球物理学报,51(2):431-438.
    常利军,丁志峰,王椿镛.2010.2010年玉树7.1级地震震源区横波分裂的变化特征.地球物理学报,53(11):2613-2619.