Spatial distribution of stress and frictional strength along the interplate boundary in northern Japan and its correlation to the locations of large earthquakes
Spatial distribution of stress and frictional strength along the interplate boundary in northern Japan and its correlation to the locations of large earthquakes
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日本北部板间边界应力和摩擦强度的空间分布及其与大地震地点的相关性
DOI：
10.1016/j.tecto.2011.08.004
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Y.Tanioka
中科院分区：
文献类型：
--
作者：
Ghimire;S.;Y.Tanioka
利用日本国立地球科学与灾害预防研究所（NIED）编制的震源机制解，研究了日本北方东北和北海道地区太平洋板块和鄂霍次克板块间边界应力沿着的空间分布。在这项工作中，板间边界被推断为定义双地震带（贝尼奥夫带）的上边界的表面。为了研究应力场的空间变化，我们将板间边界划分为20 km × 20 km的次级断裂，并估算了每个10 km厚的次级断裂的应力场。我们发现，在应力状态沿着在日本北方太平洋板块俯冲带明显的空间变化。虽然大部分研究区域的特征是海沟正常单轴压缩，在日高碰撞带，千岛群岛和日本弧之间的碰撞的签名是明显的径向压缩。最大主应力方向与断层法线夹角（θ）的分布表明，在θ = 30 ~ 45°之间的区域发生了俯冲型大地震。然而，在最近的M9.1，2011年东北冲地震的情况下，这种相关性没有观察到。进一步研究了沿板间边界沿着的摩擦强度。我们的研究结果表明：（1）断层倾角在30 ~ 45°之间的断层段为中强（摩擦系数在0.6 ~ 0.8之间），断层倾角在45 ~ 62°之间的断层段为中强（摩擦系数在0.4 ~ 0.6之间），断层倾角在62°以上的断层段为弱（摩擦系数在0.4以下）。
We investigate spatial distribution of stress along the interplate boundary between Pacific and Okhotsk plates in Tohoku and Hokkaido regions, northern Japan from earthquake focal mechanisms compiled from the National Institute for Earth Science and Disaster Prevention (NIED) of Japan. The interplate boundary in this work is inferred as the surface defining the upper boundary of the double seismic zone (Benioff Zone). To investigate spatial variation in stress field we divide the interplate boundary into 20km×20km subfaults and estimate stress field in each subfault of 10km thickness. We find clear spatial variation in stress state along the subduction zone of the Pacific plate in northern Japan. Though most of the study area is characterized by trench normal uniaxial compression, in the Hidaka Collision Zone, the signature of collision between the Kurile and Japan arcs is evident in terms of radial compression. Distribution of the angle (ψ) between the maximum principal stress direction and the fault normal shows that the large subduction earthquakes have occurred in the region where this angle ψ varies between 30 and 45°. However in the case of recent M9.1, 2011 Tohoku-Oki earthquake, this correlation is not observed. We further investigate the frictional strength along the interplate boundary. Our results suggest: (1) The fault segments with ψ between 30 and 45°are frictionally strong (with friction coefficients between 0.6 and 0.8), (2) The fault segments with ψ between 45 and 62°are intermediately strong (with friction coefficients between 0.4 and 0.6), and (3) The fault segments with ψ above 62°are weak (with friction coefficients below 0.4).
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DOI：
10.1029/2010eo220001
发表时间：
2010
期刊：
Eos, Transactions American Geophysical Union
影响因子：
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影响因子：
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DOI：
10.4294/jpe1952.34.supplement_s175
发表时间：
1986
期刊：
Journal of physics of the earth
影响因子：
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DOI：
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发表时间：
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期刊：
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