气候变化领域集成服务门户(CCPortal): Mapping Stress and Fluids on Faults by Nonshear Earthquakes

CCPortal

DOI	10.1029/2020JB021287
	Mapping Stress and Fluids on Faults by Nonshear Earthquakes
	Vavryčuk V.; Adamová P.; Doubravová J.; Ren Y.
发表日期	2021
ISSN	21699313
卷号	126 期号:2
英文摘要	Fluids on faults facilitate triggering of earthquakes and affect seismic energy release. Their detection in the focal zone is, however, difficult. Here, we present mapping of stress changes and fluid flow based on determining seismic moment tensors (MTs), which describe focal mechanisms and shear/tensile/compressive fracturing modes of earthquake sources. We calculate highly accurate MTs of 4,500 microearthquakes that occurred in the West Bohemia swarm region in the period of 2008–2018. The extent and quality of the moment tensor data are unique and allow us to study detailed behavior of the nondouble-couple (nonDC) components of MTs along the fault. The nonDC components were mostly zero or negative and indicated shear/compressive fracturing. However, also a patch with positive nonDC components, indicating tensile fracturing, was revealed. The inversion for stress and modeling of the Coulomb stress change confirmed that this patch is under anomalous stress conditions. Tensile fractures in the patch were opened due to interaction of tensile fault steps and filled by overpressurized fluids. Hence, evaluating nonDC components of earthquakes might help for tracing stress variations and fault interactions, identifying pathways of fluids and locating areas with overpressure prone to being activated. © 2021. The Authors.
英文关键词	fluids; focal mechanism; seismic moment tensors; stress inversion
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/187368
作者单位	Institute of Geophysics, The Czech Academy of Sciences, Praha, Czech Republic; University of Science and Technology Beijing, Beijing, China
推荐引用方式 GB/T 7714	Vavryčuk V.,Adamová P.,Doubravová J.,et al. Mapping Stress and Fluids on Faults by Nonshear Earthquakes[J],2021,126(2).
APA	Vavryčuk V.,Adamová P.,Doubravová J.,&Ren Y..(2021).Mapping Stress and Fluids on Faults by Nonshear Earthquakes.Journal of Geophysical Research: Solid Earth,126(2).
MLA	Vavryčuk V.,et al."Mapping Stress and Fluids on Faults by Nonshear Earthquakes".Journal of Geophysical Research: Solid Earth 126.2(2021).