DOI: 10.1038/s41561-021-00728-x
论文题名: Subslab heterogeneity and giant megathrust earthquakes
作者: Fan J. ; Zhao D.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2021
卷: 14, 期: 5 起始页码: 349
结束页码: 353
语种: 英语
英文关键词: earthquake
; heterogeneity
; mantle upwelling
; nucleation
; seismic velocity
; slab
; subduction zone
英文摘要: The nucleation and rupture processes of giant megathrust earthquakes (M ≥ 9.0) in subduction zones are still controversial. Most previous studies have focused on the subducting plate interface, and the structure beneath the subducting slab and its influence on earthquake generation remain unclear. Here, we present high-resolution seismic velocity tomography beneath six regions where giant earthquakes have occurred. Subslab low-velocity (slow) anomalies are revealed, which may reflect hot mantle upwelling. The giant earthquake hypocentres are generally located above the edges of the slow anomalies or above the gaps between them. Large coseismic slips of the giant earthquakes mainly occurred above gaps between the slow anomalies. We suggest that differential buoyancy force between the slow anomalies and their gaps may be an important factor for earthquake nucleation, and the rupture extent of a giant earthquake may be constrained by the slow anomalies. Hence, it is necessary to conduct seismic tomography to investigate the detailed subslab structure, which may help to pinpoint the potential location and damage zone of a future giant earthquake. © 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/169744
Appears in Collections: 气候变化与战略
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作者单位: CAS Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Center of Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, China; Department of Geophysics, Graduate School of Science, Tohoku University, Sendai, Japan
Recommended Citation:
Fan J.,Zhao D.. Subslab heterogeneity and giant megathrust earthquakes[J]. Nature Geoscience,2021-01-01,14(5)