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学科主题: Geosciences, Multidisciplinary
题名: Expulsion of geopressured hydrothermal system along active faults and its relation to the occurrence of earthquakes in the Shinanogawa seismic belt, Japan
作者: Xu, HL ; Oki, Y ; Sato, O
通讯作者: hlxu@scsio.ac.cn
关键词: Shinanogawa seismic belt ; 1995 Northern Niigata Earthquake ; geopressured hydrothermal system (GHS) ; buried active fault ; expulsion of GHS
刊名: SCIENCE IN CHINA SERIES D-EARTH SCIENCES
发表日期: 2005
卷: 48, 期:2, 页:273-281
收录类别: sci
部门归属: Chinese Acad Sci, S China Sea Inst Oceanol, Lab Marginal Sea Geol, Guangzhou 510301, Peoples R China; Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510301, Peoples R China; Niigata Univ, Res Inst Hazards Snowy Areas, Niigata 9502181, Japan
项目归属: 海洋地质
摘要: The 1995 Northern Niigata Earthquake (M 6.0) occurred at a shallow depth in the Niigata seismic gap. The anomaly areas in temperature, electrical conductivity and Cl- concentration of groundwater trend northeast as linear distribution in the epicentral area and are approximately coincident with the area of the seismic intensity 6 (JMA scale). The distributions of seismic intensity 6 and groundwater anomalies convincingly imaged the presence of a buried active fault beneath the epicentral area. The occurrence of this earthquake and the anomalies of groundwater were related to the expulsion of geopressured hydrothermal system (GHS). All epicenters of the destructive earthquakes along the Shinanogawa seismic belt are actually located in the buried active fault zones characterized by the areas of temperature and geochemical anomalies of groundwater. These earthquakes might have been triggered by the activity of GHS. The expulsion of GHS along an active fault in combination with the thermal softening of fault zone attributed to high rock temperature may reduce fracture strength of the rock, and trigger earthquake occurrence. The dimension of the anomaly area of groundwater temperature at the epicentral area reflected the scale of the earthquake fault. The linear anomaly areas of groundwater resulting from the expulsion of GHS and having no historical destructive earthquake are of the predicated areas of future destructive earthquakes. Monitoring of groundwater conditions in these areas may provide useful information regarding the future occurrence of earthquakes.
WOS记录号: WOS:000228190600015
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4872
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Recommended Citation:
Xu, HL; Oki, Y; Sato, O.Expulsion of geopressured hydrothermal system along active faults and its relation to the occurrence of earthquakes in the Shinanogawa seismic belt, Japan,SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2005,48(2):273-281
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文件名: Expulsion of geopressured hydrothermal system along active faults and its relation to the occurrence of earthquakes in the Shinanogawa seismic belt, Japan.pdf
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