气候变化领域集成服务门户(CCPortal): The Role of Fluids in the 2008 Ms8.0 Wenchuan Earthquake, China

CCPortal

DOI	10.1029/2020JB019959
	The Role of Fluids in the 2008 Ms8.0 Wenchuan Earthquake, China
	Wang Z.; Wang J.; Yang X.
发表日期	2021
ISSN	21699313
卷号	126 期号:2
英文摘要	Fluid intrusions into seismic zones play a fundamental role in the initiation of earthquakes and rupture processes, yet the mechanisms that control these interactions are enigmatic and widely debated. Here, we present a series of signatures for new seismic velocities (Vp, Vs) and Vp/Vs ratio imaging and stress simulations that reveal the impact of fluids, including partial melting, on the seismogenesis of the 2008 Wenchuan earthquake that occurred on the eastern Tibetan Plateau. We found that a prominent low-V and high-Vp/Vs body under the western side of the 2008 Wenchuan hypocenter and two gaps characterized by low-V and high-Vp/Vs inserted into its rupture process were clearly imaged. One of these gaps terminated the southwestward coseismic slip while the other weakened the northeastern rupture process. We interpreted both of these bodies as the result of fluid penetration associated with partial melting of the ductile flow from the lower crust of Tibet. Such ductile materials were pushed against the rigid basement of the Yangtze craton and accumulated there, maintaining high pore pressure. We presume that a system such as this, with high pore pressure and fluids in the fluid-pressurized regime, might have reduced the threshold for fault failure, transformed this zone into a potential fault risk front, and thus increased the likelihood of failure of the mainshock fault. We speculate that fluids invading the seismogenic layer of the Longmen-Shan fault zone played a crucial role in the initiation of the 2008 Wenchuan earthquake and its rupture process. © 2020. The Authors.
英文关键词	fluid intrusion; fluid-pressurized regime; pore pressure accumulation; potential fault risk front; Wenchuan earthquake
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187330
作者单位	Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou, China; Southern Marine Science and Engineering Guangdong Laboratory, Guangzhou, China; School of Geoscience and Technology, Southwest Petroleum University, Chengdu, China
推荐引用方式 GB/T 7714	Wang Z.,Wang J.,Yang X.. The Role of Fluids in the 2008 Ms8.0 Wenchuan Earthquake, China[J],2021,126(2).
APA	Wang Z.,Wang J.,&Yang X..(2021).The Role of Fluids in the 2008 Ms8.0 Wenchuan Earthquake, China.Journal of Geophysical Research: Solid Earth,126(2).
MLA	Wang Z.,et al."The Role of Fluids in the 2008 Ms8.0 Wenchuan Earthquake, China".Journal of Geophysical Research: Solid Earth 126.2(2021).