DOI: 10.1016/j.epsl.2017.11.022
Scopus记录号: 2-s2.0-85035102013
论文题名: Interactions between strike-slip earthquakes and the subduction interface near the Mendocino Triple Junction
作者: Gong J. ; McGuire J.J.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 482 起始页码: 414
结束页码: 422
语种: 英语
英文关键词: afterslip
; locking
; second moments
Scopus关键词: Deformation
; Friction
; Geodetic satellites
; Geophysics
; Interface states
; Locks (fasteners)
; Magnetic devices
; Tectonics
; Transform faults
; afterslip
; Intraplate earthquakes
; Intraplate seismicity
; locking
; Mendocino triple junctions
; Second moments
; Seismically active region
; Strike-slip earthquakes
; Earthquakes
; earthquake magnitude
; earthquake rupture
; inverse problem
; North American plate
; Pacific plate
; plate boundary
; seismicity
; strike-slip fault
; subduction
; Mendocino Triple Junction
; Pacific Ocean
英文摘要: The interactions between the North American, Pacific, and Gorda plates at the Mendocino Triple Junction (MTJ) create one of the most seismically active regions in North America. The earthquakes rupture all three plate boundaries but also include considerable intraplate seismicity reflecting the strong internal deformation of the Gorda plate. Understanding the stress levels that drive these ruptures and estimating the locking state of the subduction interface are especially important topics for regional earthquake hazard assessment. However owing to the lack of offshore seismic and geodetic instruments, the rupture process of only a few large earthquakes near the MTJ have been studied in detail and the locking state of the subduction interface is not well constrained. In this paper, first, we use the second moments inversion method to study the rupture process of the January 28, 2015 Mw 5.7 earthquake on the Mendocino transform fault that was unusually well recorded by both onshore and offshore strong motion instruments. We estimate the rupture dimension to be approximately 6 km by 3 km corresponding to a stress drop of ∼4 MPa for a crack model. Next we investigate the frictional state of the subduction interface by simulating the afterslip that would be expected there as a result of the stress changes from the 2015 earthquake and a 2010 Mw 6.5 intraplate earthquake within the subducted Gorda plate. We simulate afterslip scenarios for a range of depths of the downdip end of the locked zone defined as the transition to velocity strengthening friction and calculate the corresponding surface deformation expected at onshore GPS monuments. We can rule out a very shallow downdip limit owing to the lack of a detectable signal at onshore GPS stations following the 2010 earthquake. Our simulations indicate that the locking depth on the slab surface is at least 14 km, which suggests that the next M8 earthquake rupture will likely reach the coastline and strong shaking should be expected there. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110124
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Massachusetts Institute of Technology, Woods Hole Oceanographic Institution, Joint Program in Oceanography/Applied Ocean Science and Engineering, Woods Hole, MA 02543, United States; Dept. of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States
Recommended Citation:
Gong J.,McGuire J.J.. Interactions between strike-slip earthquakes and the subduction interface near the Mendocino Triple Junction[J]. Earth and Planetary Science Letters,2018-01-01,482