Seismic activity and deformation process of the overriding plate in the northeastern Japan subduction zone
Seismic activity and deformation process of the overriding plate in the northeastern Japan subduction zone
复制标题
日本东北俯冲带上覆板块的地震活动与变形过程
DOI：
10.1016/s0040-1951(99)00296-6
复制
发表时间：
2000
期刊：
影响因子：
2.9
通讯作者：
Hiroki Sato
中科院分区：
文献类型：
--
作者：
A. Hasegawa;A. Yamamoto;N. Umino;S. Miura;S. Horiuchi;Dapeng Zhao;Hiroki Sato
我们估计的温度分布在日本东北部弧从P波速度扰动旅行时间层析成像获得的地壳。通过将估计的温度分布与浅源、精确定位的微地震的震源深度分布进行比较，我们发现，脆性到韧性或粘滑到稳定滑动的转变发生在400°C等温线处，并且转变深度具有相当大的横向变化。脆性孕震带，即地壳上部，在P波低速区局部变薄，估计那里的温度相对较高。在低速区还观察到浅源微震的集中、高地形和地壳较大的收缩变形。活动断层不分布在低速区，而是沿着低速区边缘或低速区外。所有这些观测结果表明，地壳内地震的发生和变形在很大程度上受火山弧热状况的控制，其特点是温度水平分布不均匀。
We estimated the temperature distribution within the crust of the northeastern Japan arc from P wave velocity perturbations obtained by travel time tomography. By comparing the estimated temperature distribution with the focal depth distribution of shallow, precisely relocated microearthquakes, we found that the brittle to ductile or stick-slip to stable-sliding transition occurs at the ∼400°C isotherm and that the transition depth has considerable lateral variations. The brittle seismogenic zone, the upper portion of the crust, becomes locally thin in the P wave low-velocity areas, where the temperature is estimated to be relatively high. Concentration of shallow microearthquakes, high topography and relatively large contractile deformation of the crust are also observed in these low-velocity areas. Active faults are not distributed in the low-velocity areas but lie just along the edge of those areas or outside them. All these observations suggest that earthquake occurrence and deformation within the crust is governed, to a considerable degree, by the thermal regime of this volcanic arc, which is characterized by a horizontally inhomogeneous distribution of temperature.
日本地下三维纵波和横波速度结构
DOI：
--
发表时间：
2008
期刊：
Phys. Earth Planet. Inter. 168
影响因子：
--
作者：
Chow;et al.;Nakamura M.
通讯作者：
Nakamura M.
影响因子：
2.9
作者：
HASEGAWA, A;YAMAMOTO, A
通讯作者：
YAMAMOTO, A