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Modeling transient and long-term postseis-mic deformation: A case study of 1995 Mw9.5 chile earthquake

earthquake Science 2008年第4期21卷 406-416+442页

作者：邵志刚傅容珊薛廷虓查显杰 Key Laboratory of Crust-Mantle Materials and Environments Chinese Academy of Sciences College of Earth and Space Sciences University of Science and Technology of China

In this paper, we firstly use finite element method (FEM) with Burgers model to simulate the postseismic viscoe-lastic relaxation taking 1960 chile earthquake as an example. The postseismic deformation modeled with Burgers model includes co-seismic deformation, transient postseismic deformation and long-term postseismic deformation. So if we apply Burgers model to calculate postseismic deformation of 1960 chile earthquake, there is no discrep-ancy phenomenon due to different durations of postseismic deformations that happens in Maxwell model.

关键词： chile earthquake postseismic deformation Burgers model viscoelastic medium FEM

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Characteristics of seismic activity before chile M_W8.8 earthquake in 2010

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earthquake Science 2010年第4期23卷 333-341页

作者： Yan Xue Jie Liu Gang Li Institute of Geophysics China Earthquake Administration Beijing 100081 China China earthquake Networks Center Beijing 100045 China

The tempo-spatial variation of seismic activity before great chile Mw8.8 earthquake on February 27, 2010 is studied. Some results are as follows： ①Two types of seismic gaps appeared before the chile MwS.8 shock. One is background gap of Mw≥8.0 earthquakes with 360 km length since 1900, the other is seismogenic gap formed by M≥5.5 earth- quakes with 780km length five years before the chile earthquake; ②There was only one Mw7.1 earthquake in the middle and southern part of chile from 1986 to 2010. The obvious quiescence of Mw≥7.0 earthquake is the long-term background anomaly for the chile earthquake; ③ The quiescence of M≥6.5 earthquakes appeared in South American block and its vicinity during the period from 2007 to 2009, and the quietude state has been disappeared three months before the chile Mw8.8 earthquake; ④ The deep and intermediate-depth earthquake activity has been noticeablely strengthened in the subduction zone of South American block since 1993; ⑤The great chile earthquake shows that global seismicity is still in the active period of Mw≥8.5 earthquakes since 2004. Based on the characteristics of the former two active periods, several great earthquakes with Mw≥8.5 would take place in a few years. In addition, the circum-Pacific seismic belt would be the main region for Mw≥8.0 earthquakes.

关键词： chile earthquake two types of seismic gaps deep and intermediate-depth earthquake South Americanblock circum-Pacific seismic belt

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Comparison of two great chile tsunamis in 1960 and 2010 using numerical simulation

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earthquake Science 2011年第5期24卷 475-483页

作者： Ruizhi Wen Yefei Ren Xiaojun Li Rong Pan Institute of Engineering Mechanics China Earthquake Administration Harbin 150080 China Institute of Geophysics China Earthquake Administration Beijing 100081 China Nuclear and Radiation Safety Center Ministry of Environmental Protection Beijing 100082 China

Great differences in hazard and losses were shown from two tsunamis, both generated in chile, one in 1960 and the other in 2010. Numerical simulation was applied to the tsunami analysis. The fault dislocation of the seafioor was assumed to equal to the initial tsunami wave field, which can be calculated by the formula of fault dislocation in the elastic isotropic half-space. The linear long wave theory was used as the tsunami hydrodynamic model, and the finite difference method and leap-frog scheme were selected for solving the equations. The accuracy of the simulated results was verified by the observed data in five tide gauges. By means of two scenario tsunamis, the analytical results show that the earthquake magnitude, bathymetry in rupture zone and rapid release of warning information in 2010 tsunami are the main explanations of the aforementioned great difference.

关键词： chile earthquake tsunami numerical simulation

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