DOI: 10.1038/s41561-021-00741-0
论文题名: Physical conditions and frictional properties in the source region of a slow-slip event
作者: Arnulf A.F. ; Biemiller J. ; Lavier L. ; Wallace L.M. ; Bassett D. ; Henrys S. ; Pecher I. ; Crutchley G. ; Plaza Faverola A.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2021
卷: 14, 期: 5 起始页码: 334
结束页码: 340
语种: 英语
英文关键词: fault slip
; fluid flow
; mechanical property
; seismic data
; subduction zone
; Hikurangi
; New Zealand
; North Island
; Northland
英文摘要: Recent geodetic studies have shown that slow-slip events can occur on subduction faults, including their shallow (<15 km depth) parts where tsunamis are also generated. Although observations of such events are now widespread, the physical conditions promoting shallow slow-slip events remain poorly understood. Here we use full waveform inversion of controlled-source seismic data from the central Hikurangi (New Zealand) subduction margin to constrain the physical conditions in a region hosting slow slip. We find that the subduction fault is characterized by compliant, overpressured and mechanically weak material. We identify sharp lateral variations in pore pressure, which reflect focused fluid flow along thrust faults and have a fundamental influence on the distribution of mechanical properties and frictional stability along the subduction fault. We then use high-resolution data-derived mechanical properties to underpin rate–state friction models of slow slip. These models show that shallow subduction fault rocks must be nearly velocity neutral to generate shallow frictional slow slip. Our results have implications for understanding fault-loading processes and slow transient fault slip along megathrust faults. © 2021, 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/169712
Appears in Collections: 气候变化与战略
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作者单位: Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, TX, United States; GNS Science, Lower Hutt, New Zealand; University of Auckland, Auckland, New Zealand; GEOMAR Helmholtz Centre for Ocean Research, Kiel, Germany; CAGE – Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geosciences, UiT The Arctic University of Norway, Tromsø, Norway
Recommended Citation:
Arnulf A.F.,Biemiller J.,Lavier L.,et al. Physical conditions and frictional properties in the source region of a slow-slip event[J]. Nature Geoscience,2021-01-01,14(5)