Shallow crustal permeability enhancement in central Japan due to the 2011 Tohoku earthquake

被引：26
|
作者：
Kinoshita, Chihiro [1 ]
Kano, Yasuyuki [1 ]
Ito, Hisao [1 ]
机构：
[1] Kyoto Univ, Disaster Prevent Res Inst, Kyoto, Japan
来源：
GEOPHYSICAL RESEARCH LETTERS | 2015年 / 42卷 / 03期
关键词：
hydraulic diffusivity; Tohoku earthquake; permeability; static stress; dynamic stress; pore pressure; WENCHUAN EARTHQUAKE; KOBE EARTHQUAKE; SEISMIC-WAVES; MECHANISM; PRESSURE; WELLS;
D O I：
10.1002/2014GL062792
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
Pore pressure decreased at the Kamioka mine in central Japan after the Tohoku earthquake (M9.0) on 11 March 2011, which can be attributed to a permeability increase. We focus on the Earth's tidal response before and after the earthquake to evaluate rock permeability change through hydraulic diffusivity change. If we assume a constant elastic modulus, hydraulic diffusivity is found to increase from 3.3 to 6.7m(2)/s after the Tohoku earthquake. We also analyzed data before and after the 2007 Noto Hanto (M6.9) and 2008 Suruga Bay (M6.5) earthquakes, which yield no significant tidal response changes. We examined the amount of dynamic and static stress changes caused by these earthquakes and show that it is difficult to attribute the permeability enhancement solely to dynamic stress, and static stress change may also affect the permeability enhancement.
引用
收藏
页码：773 / 780
页数：8
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