DOI: 10.1016/j.epsl.2020.116104
论文题名: Rapid localized flank inflation and implications for potential slope instability at Tungurahua volcano, Ecuador
作者: Hickey J. ; Lloyd R. ; Biggs J. ; Arnold D. ; Mothes P. ; Muller C.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 534 语种: 英语
中文关键词: deformation
; Finite Element Analysis
; InSAR
; slope stability
; Tungurahua volcano
英文关键词: Deformation
; Finite element method
; Infiltration
; Shear stress
; Slope protection
; Volcanoes
; Collapse surfaces
; Deformation pattern
; General applications
; InSAR
; Maximum displacement
; Significant surfaces
; Surface deformation
; Tungurahua Volcano
; Slope stability
; asymmetry
; deformation
; finite element method
; numerical model
; slope failure
; slope stability
; synthetic aperture radar
; volcano
; Ecuador
; Tungurahua
; Tungurahua Volcano
英文摘要: High rates of volcano surface deformation can be indicative of a forthcoming eruption, but can also relate to slope instability and possible flank collapse. Tungurahua volcano, Ecuador, has been persistently active since 1999 and has previously experienced catastrophic flank failures. During the ongoing eruptive activity, significant surface deformation has been observed, with the highest rates contained within the amphitheatre-shaped scar from the 3000-year-old failure on the west flank. However, the cause of this asymmetric deformation and how it might relate to slope stability has not been assessed. Here, for the first time, we present a range of models to test physical processes that might produce asymmetric deformation, which are then applied to slope stability. Our models are informed by InSAR measurements of a deformation episode in November 2015, which show a maximum displacement of ∼3.5 cm over a period of ∼3 weeks, during which time the volcano also experienced multiple explosions and heightened seismicity. Asymmetric flank material properties, from the rebuilding of the cone, cannot explain the full magnitude and spatial footprint of the observed west flank deformation. The inflation is inferred to be primarily caused by shallow, short-term, pre-eruptive magma storage that preferentially exploits the 3 ka flank collapse surface. Shallow and rapid pressurization from this inclined deformation source can generate shear stress along the collapse surface, which increases with greater volumes of magma. This may contribute to slope instability during future unrest episodes and promote flank failure, with general application to other volcanoes worldwide displaying asymmetric deformation patterns. © 2020 The Author(s) Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165024
Appears in Collections: 气候变化与战略
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作者单位: Camborne School of Mines, University of Exeter, Penryn Campus, Cornwall TR10 9FE, United Kingdom; COMET, School of Earth Sciences, University of Bristol, Queens Road, Bristol, BS8 1RJ, United Kingdom; Instituto Geofísico, Escuela Politécnica Nacional, Quito, Ecuador; Observatorio Vulcanologico y Sismológico de Costa Rica, Universidad Nacional, Costa Rica
Recommended Citation:
Hickey J.,Lloyd R.,Biggs J.,et al. Rapid localized flank inflation and implications for potential slope instability at Tungurahua volcano, Ecuador[J]. Earth and Planetary Science Letters,2020-01-01,534