DOI: 10.1016/j.epsl.2021.116757
论文题名: Do intraplate and plate boundary fault systems evolve in a similar way with repeated slip events?
作者: McKay L. ; Lunn R.J. ; Shipton Z.K. ; Pytharouli S. ; Roberts J.J.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 559 语种: 英语
中文关键词: earthquake energy balance
; fault core
; fault thickness
; intraplate faults
; plate boundary fault internal structure
; plate boundary faults
英文关键词: Earthquakes
; Plates (structural components)
; Rocks
; Earthquake magnitudes
; Internal structure
; Plate boundaries
; Rock fracturing
; Scaling relations
; Surface ruptures
; Surrounding rock
; Tectonic plates
; Fault slips
; displacement
; earthquake magnitude
; earthquake mechanism
; energy dissipation
; fault geometry
; fault slip
; fault zone
; friction
; intraplate process
; plate boundary
; rupture
; seismic moment
; slip rate
; structural geology
; tectonic plate
英文摘要: As repeated slip events occur on a fault, energy is partly dissipated through rock fracturing and frictional processes in the fault zone and partly radiated to the surface as seismic energy. Numerous field studies have shown that the core of intraplate faults is wider on average with increasing total displacement (and hence slip events). In this study we compile data on the fault core thickness, total displacement and internal structure (e.g., fault core composition, host rock juxtaposition, slip direction, fault type, and/or the number of fault core strands) of plate boundary faults to compare to intraplate faults (within the interior of tectonic plates). Fault core thickness data show that plate boundary faults are anomalously narrow by comparison to intraplate faults and that they remain narrow regardless of how much total displacement they have experienced or the local structure of the fault. By examining the scaling relations between seismic moment, average displacement and surface rupture length for plate boundary and intraplate fault ruptures, we find that for a given value of displacement in an individual earthquake, plate boundary fault earthquakes typically have a greater seismic moment (and hence earthquake magnitude) than intraplate events. We infer that narrow plate boundary faults do not process intact rock as much during seismic events as intraplate faults. Thus, plate boundary faults dissipate less energy than intraplate faults during earthquakes meaning that for a given value of average displacement, more energy is radiated to the surface manifested as higher magnitude earthquakes. By contrast, intraplate faults dissipate more energy and get wider as fault slip increases, generating complex zones of damage in the surrounding rock and propagating through linkage with neighbouring structures. The more complex the fault geometry, the more energy has to be consumed at depth during an earthquake and the less energy reaches the surface. © 2021 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165598
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Department of Civil and Environmental Engineering, University of Strathclyde, 75 Montrose Street, Glasgow, G1 1XJ, United Kingdom
Recommended Citation:
McKay L.,Lunn R.J.,Shipton Z.K.,et al. Do intraplate and plate boundary fault systems evolve in a similar way with repeated slip events?[J]. Earth and Planetary Science Letters,2021-01-01,559