DOI: 10.1038/s41561-020-0562-9
论文题名: Subduction megathrust heterogeneity characterized from 3D seismic data
作者: Kirkpatrick J.D. ; Edwards J.H. ; Verdecchia A. ; Kluesner J.W. ; Harrington R.M. ; Silver E.A.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2020
卷: 13, 期: 5 起始页码: 369
结束页码: 374
语种: 英语
英文关键词: earthquake rupture
; overburden
; physical property
; seismic data
; seismic reflection
; shear strength
; spatial variation
; subduction
; subduction zone
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169631
Appears in Collections: 气候变化与战略
There are no files associated with this item.
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
Recommended Citation:
Kirkpatrick J.D.,Edwards J.H.,Verdecchia A.,et al. Subduction megathrust heterogeneity characterized from 3D seismic data[J]. Nature Geoscience,2020-01-01,13(5)