摘要
发生在2004年12月26日的印尼苏门答腊8.7级地震,是全球有地震台网以来100多年中记录到的少数几次特大地震之一。初步汇集了在中国陆区观测到的地震活动、地壳形变、地下流体等多学科震时和震后效应的异常变化,包括地震活动性(特别是云南地区)的显著增强;地壳形变观测,尤其是钻孔应变观测记录到地壳应力-应变的震时和震后显著变化,以及地下水温度、化学成分、特别是水位的突出变化。同时,还从库仑破裂应力触发、动态应力触发以及下地壳和上地幔流动变形机制等方面,对这些大震效应作了一些成因机理讨论。
The Sumatra earthquake with magnitude 8.7, occurred near Sumatra Island, on December 26, 2004, has been one of the largest earthquakes since the foundation of global seismic net for almost 100 years. This paper elementarily collects the anomalies of coseismic and post-seismic effect such as seismic activity, crustal deformation and underground liquid and so on observed in China＇s mainland, which include the evident seismic activity （especially in Yunnan） increase, obvious crustal deformation, such as the abnormal variation of crustal stress and strain in bore volumetric deformeter and the remarkable change of underground temperature, the chemical component, especially the underground water level. Finally, some possible physical mechanisms, for example the Coulomb stress-triggering mechanism, the dynamic stress-triggering mechanism and the lower crust and upper mantle flow deformation mechanism, which may generate these coseismic and post-seismic anomalies, are discussed.
出处
《地震》
CSCD
北大核心
2005年第4期15-25,共11页
Earthquake
基金
科技部社会公益项目(2004DIA3J010)
关键词
苏门答腊8.7级地震
震时和震后效应
应力触发
流动变形
Sumatra earthquake with magnitude 8.7
Coseismic and post-seismic effect
Stress triggering
Flow deformation
