Internal structure and permeability of Wenchuan earthquake fault

被引：30

作者：

Chen Jian-Ye ^{[1
]}

Yang Xiao-Song ^{[1
]}

Dang Jia-Xiang ^{[1
]}

He Chang-Rong ^{[1
]}

Zhou Yong-Sheng ^{[1
]}

Ma Sheng-Li ^{[1
]}

机构：

[1] China Earthquake Adm, State Key Lab Earthquake Dynam, Inst Geol, Beijing 100029, Peoples R China

来源：

CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION | 2011年 / 54卷 / 07期

关键词：

Wenchuan earthquake; Earthquake fault; Permeability; High-pressure fluid; Thermal pressurization; FLUID-PRESSURE; LABORATORY CHARACTERIZATION; THERMAL PRESSURIZATION; SOUTHWEST JAPAN; ROCKS; GOUGE; SLIP; TEMPERATURE; STRENGTH; INSIGHTS;

D O I：

10.3969/j.issn.0001-5733.2011.07.014

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Cross-fault permeability measurement was conducted on the Wenchuan earthquake fault. The results showed that this earthquake fault consists of fault core with low permeability (2. 4 X 10(-19) - 3. 8 X 10(-16) m(2)), highly permeable damaged zone (3. 7 X 10(-16) - 3. 0X 10(-15) m(2)) and the fractured protolith (6. 0x 10(-18) - 4. 3 X 10(-13) m(2)) (40 MPa effective pressure), among which fresh gouges on the main slip surface are the most impermeable. Impeded by the impermeable protolith and fault gouge, cross-fault fluid flow was inhibited and fluid activity was confined within the damaged zone. This recognition is consistent with microstructure and grain size distribution of fault rocks. Condition of co-seismic thermal pressurization was calculated and the results showed that at depth greater than 2 km, the main slip zone of Wenchuan earthquake has the characteristics of low permeability for thermal pressurization to occur.

引用

页码：1805 / 1816

页数：12

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