Model of the 2011 Great East Japan earthquake (M = 9.0)

被引:0
作者
V. P. Trubitsyn
机构
[1] Russian Academy of Sciences,Institute of Physics of the Earth
[2] Russian Academy of Sciences,International Institute of Earthquake Prediction Theory and Mathematical Geophysics
来源
Izvestiya, Atmospheric and Oceanic Physics | 2012年 / 48卷
关键词
islands arcs; subduction; elastic rebound; plate asperities;
D O I
暂无
中图分类号
学科分类号
摘要
Intraplate earthquakes are described by a model of a thrust fault in continuous or cracked media. Such a model can also be used to describe interplate earthquakes, in particular, strong earthquakes in subduction zones. However, new seismic, tectonic, and GPS data for this strong Japanese earthquake demand a more detailed model. One possible model can be a model of the elastic island plate coupled with a dipping oceanic plate with submarine mountings. These mountings, sitting on the dipping oceanic plate, hinder its motion due to coupling with asperities on the bottom of the island plate. When coupling ends, the bottom of the plate can be cut as if by a plough and an earthquake can take place. The decoupling of a mountain leads to a weaker interpolate earthquake, a forshock, and an aftershock. The main earthquake is a result of the effect of a basaltic plateau or a large mountain, which leads to the avalanching decoupling of all mountains on a large area of coupled plates. In the first approximation we can consider that, despite its deformation, an oceanic plate is constantly moving with a nearly constant velocity all times both during earthquakes and in between them. An island plate behaves similarly to an elastic plate, which permanently bends due to torque acting on its junction with a dipping oceanic plate. After the earthquake, the bending plate becomes straight. This leads to it thrusting on the oceanic plate with displacement toward the ocean, an uplift of its oceanic part, and the sinking of its island part by the following tsunami.
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页码:673 / 682
页数:9
相关论文
共 7 条
[1]  
Rogozhin E.A.(2011)The Structure of the 2011 March 11 Tohoku (Japan) Earthquake ( Vopr. Inzh. Seismol. 38 5-20
[2]  
Trubitsyn V.P.(2001) = 9.0), Its Makroseismic, Seismological, and Geodynamic Manifestations Vychisl. Seismol. 32 248-256
[3]  
Rykov V.V.(2007)A Numerical Model of the Formation of Marginal Seas under the Movement of Eurasia to the Subduction Zone, Split of Japan and Its Possible Future Unification with Eurasia Bull. Seismol. Soc. Amer. 97 1121-1132
[4]  
Zhao D.(undefined)Tomographic Imaging Outside a Seismic Network: Application to the Northeast Japan Arc undefined undefined undefined-undefined
[5]  
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[6]  
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