全球定位系统测定的2011年日本宫城M_W9.0级地震远场同震位移
摘要
据覆盖日本全境的GEONET网络GPS观测资料显示,2011年3月11日的日本宫城MW9.0级地震造成日本半岛向东移动,最大达到了5.3m.利用国家重大科技基础设施项目"中国大陆构造环境监测网络"的GPS观测资料,分析此次地震对中国大陆构造形变场的同震影响,结果显示,地震造成我国东北和华北地区产生毫米至厘米级的同震水平位移,最大值为35mm.通过应变分析发现,地震导致东北和华北地区一系列北北东走向的断裂产生了不同程度的张性应变.虽然在东北地区张性应变相对比较明显,最大处约为40nano-strain,但对断裂带的静态库仑应力加载有限,不会对区域地震活动产生大的影响.
引文
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2Herring T A,King R W,McClusky S C.GAMIT Reference Manual:GPS Analysis at MIT.Release10.4.Cambridge MA:Department of Earth,Atmospheric,and Planetary Sciences,Massachusset Institute of Technology,2010
3Okada Y.Surface deformation due to shear and tensile faults in a half-space.Bull Seism Soc Am,1985,75:1135–1154
4孙文斌,和跃时,李英波.日本海区板块俯冲与华北地震.地震学报,1985,7:33–44
5孟宪森,郑辉,姜锦华.西太平洋板块俯冲与我国东北和华北块体地震活动.东北地震研究,2003,19:13–18
6李文英,王秀英.华北地区与日本海沟地震的相关性分析.地震,1996,16:219–224
7Shen Z-K,Jackson D D,Ge B X.Crustal deformation across and beyond the Los Angeles basin for geodetic measurements.J Geophys Res,1996,101:27957–27980
8闵伟,焦德成,周本刚,等.依兰-伊通断裂全新世活动的新发现及其意义.地震地质,2011,33:141–150
9Walter T R,Amelung F.Volcanic eruptions following M≥9megathrust earthquakes:Implications for the Sumatra-Andaman volcanoes.Geology,2007,35:539–542
10王凡,沈正康,王阎昭,等.2011年3月11日日本宫城MW9.0级地震对其周边地区火山活动的影响.科学通报,2011,56:1080–1083
11王敏,张培震,沈正康,等.全球定位系统(GPS)测定的印尼苏门答腊巨震的远场同震地表位移.科学通报,2006,51:365–368
12Heki K,Miyazaki S,Tsuji H.Silent fault slip following an interplate thrust earthquake at the Japan Trench.Nature,1997,386:595–598
13Nishimura T,Miura S,Tachibana K,et al.Distribution of seismic coupling on the subducting plate boundary in northeastern Japan in-ferred from GPS observations.Tectonophysics,2000,323:217–238
14Ozawa S,Kaidzu M,Murakami M,et al.Coseismic and postseismic crustal deformation after the MW8Tokachi-oki earthquake in Japan.Earth Planets Space,2004,56:675–680
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