DOI: 10.1038/s41561-020-0628-8
论文题名: Localized fault-zone dilatancy and surface inelasticity of the 2019 Ridgecrest earthquakes
作者: Barnhart W.D. ; Gold R.D. ; Hollingsworth J.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2020
卷: 13, 期: 10 起始页码: 699
结束页码: 704
语种: 英语
英文关键词: coseismic process
; deformation mechanism
; earthquake damage
; earthquake event
; earthquake rupture
; failure mechanism
; fault zone
; geological record
; satellite imagery
; California
; United States
英文摘要: Earthquakes produce a spectrum of elastic and inelastic deformation processes that are reflected across various length and time scales. While elasticity has long dominated research assumptions in active tectonics, increasing interest has focused on the inelastic characteristics of earthquakes, particularly those of the surface fault rupture zone itself, and how they relate to ground rupture hazard and the mechanics of damage zones. Here we present detailed co-seismic surface-strain analysis of the 2019 Ridgecrest, California, earthquakes. We derive three-dimensional high-resolution surface displacements from satellite optical imagery, which we then invert for the co-seismic surface-strain tensors. We show that fault-zone dilation is pervasive throughout these earthquakes and that inelastic failure is present but relatively localized (median width of 31 m). The width of the inelastic failure zone is not correlated to off-fault deformation, surface geology or displacement magnitude. Instead, the extent and kinematics of inelastic failure reflect active, mylonitic deformation of the fault damage zone that is influenced by rupture velocity and fault maturity. These results highlight how a single earthquake contributes to the long-term, permanent geologic record of faulting. © 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/169552
Appears in Collections: 气候变化与战略
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作者单位: Department of Earth and Environmental Sciences, University of Iowa, Iowa City, IA, United States; Geologic Hazards Center, US Geological Survey, Golden, CO, United States; Université Grenoble Alpes, ISTerre, Grenoble, France
Recommended Citation:
Barnhart W.D.,Gold R.D.,Hollingsworth J.. Localized fault-zone dilatancy and surface inelasticity of the 2019 Ridgecrest earthquakes[J]. Nature Geoscience,2020-01-01,13(10)