Origin of the concentrated deformation zone in the Japanese Islands and stress accumulation process of intraplate earthquakes
Origin of the concentrated deformation zone in the Japanese Islands and stress accumulation process of intraplate earthquakes
复制标题
日本列岛集中变形带成因及板内地震应力积累过程
DOI：
10.1186/bf03353090
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
Y. Kobayashi
中科院分区：
文献类型：
--
作者：
Y. Iio;T. Sagiya;Y. Kobayashi
通过对各种观测资料的分析，阐明了日本海沿岸集中变形带（新泻-神户构造带）的性质和成因。对青藏高原及其周边地区的应力状态和变形样式进行了定性建模。在这个模式中，在北高岭带下地壳中存在一个低黏度的弱带。然而，在周边地区，下地壳的黏度非常高，在板内地震的重复周期内可以看作是弹性的。变形集中的主要原因是弱区黏度较低。更详细地说，集中变形被认为是由地震间期弱带对先前的大板内地震的震后变形（脆性-韧性相互作用模型）和/或NKTZ上下地壳在有限恒力作用下的非弹性变形（非弹性变形模型）产生的。
The nature and origin of the concentrated deformation zone along the Japan Sea coast (NKTZ: Niigata-Kobe Tectonic Zone) were clarified by analyzing various observations. We made a qualitative modeling for the stress state and deformation style in and around the NKTZ. In this model a weak zone with low viscosity exists in the lower crust beneath the NKTZ. In the surrounding region, however, the viscosity in the lower crust is very high and can be regarded as elastic for the periods of a recurrence interval of intraplate earthquakes. The concentrated deformation is basically attributed to the low viscosity in the weak zone. In more details, the concentrated deformation is thought to be generated by a postseismic deformation of the weak zone to the previous large intraplate earthquake in the interseismic period (the brittle-ductile interaction model) and/or anelastic deformation in both the upper and lower crusts in the NKTZ, under a finite constant force (the anelastic deformation model).