气候变化领域集成服务门户(CCPortal): Subduction megathrust heterogeneity characterized from 3D seismic data

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DOI	10.1038/s41561-020-0562-9
	Subduction megathrust heterogeneity characterized from 3D seismic data
	Kirkpatrick J.D.; Edwards J.H.; Verdecchia A.; Kluesner J.W.; Harrington R.M.; Silver E.A.
发表日期	2020
ISSN	17520894
起始页码	369
结束页码	374
卷号	13 期号:5
英文摘要	Megathrust roughness and structural complexity are thought to be controls on earthquake slip at subduction zones because they result in heterogeneity in shear strength and resolved stress. However, because active megathrust faults are difficult to observe, the causes and scales of complexity are largely unknown. Here we measured the in situ properties of the megathrust of the Middle America subduction zone in a three-dimensional seismic reflection volume to determine how fault properties vary. We quantify spatial variability in the megathrust roughness, overburden and rock physical properties. Heterogeneity in the megathrust roughness exists at length scales of a few kilometres because the megathrust is dissected by active lower-plate normal faults, which offset the megathrust and renewed fault roughness. Spatial variations in the rock physical properties at the plate interface are characterized by correlation length scales of hundreds of metres. Frontal prism taper, historical seismicity and the variation in earthquake stress drop values local to the megathrust are all affected by the heterogeneity at these length scales. Both geometric and rheological complexities may therefore control the mechanical behaviour of the subduction plate interface, which includes earthquake rupture characteristics. © 2020, The Author(s), under exclusive licence to Springer Nature Limited.
英文关键词	earthquake rupture; overburden; physical property; seismic data; seismic reflection; shear strength; spatial variation; subduction; subduction zone
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206799
作者单位	Department of Earth and Planetary Sciences, McGill University, Montreal, QC, Canada; Earth and Planetary Sciences, University of California Santa Cruz, Santa Cruz, CA, United States; Institute of Geology, Mineralogy and Geophysics, Ruhr University Bochum, Bochum, Germany; Pacific Coastal and Marine Science Center, US Geological Survey, Santa Cruz, CA, United States
推荐引用方式 GB/T 7714	Kirkpatrick J.D.,Edwards J.H.,Verdecchia A.,et al. Subduction megathrust heterogeneity characterized from 3D seismic data[J],2020,13(5).
APA	Kirkpatrick J.D.,Edwards J.H.,Verdecchia A.,Kluesner J.W.,Harrington R.M.,&Silver E.A..(2020).Subduction megathrust heterogeneity characterized from 3D seismic data.Nature Geoscience,13(5).
MLA	Kirkpatrick J.D.,et al."Subduction megathrust heterogeneity characterized from 3D seismic data".Nature Geoscience 13.5(2020).