气候变化领域集成服务门户(CCPortal): Rapid localized flank inflation and implications for potential slope instability at Tungurahua volcano, Ecuador

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DOI	10.1016/j.epsl.2020.116104
	Rapid localized flank inflation and implications for potential slope instability at Tungurahua volcano, Ecuador
	Hickey J.; Lloyd R.; Biggs J.; Arnold D.; Mothes P.; Muller C.
发表日期	2020
ISSN	0012821X
卷号	534
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)
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
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202646
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
推荐引用方式 GB/T 7714	Hickey J.,Lloyd R.,Biggs J.,et al. Rapid localized flank inflation and implications for potential slope instability at Tungurahua volcano, Ecuador[J],2020,534.
APA	Hickey J.,Lloyd R.,Biggs J.,Arnold D.,Mothes P.,&Muller C..(2020).Rapid localized flank inflation and implications for potential slope instability at Tungurahua volcano, Ecuador.Earth and Planetary Science Letters,534.
MLA	Hickey J.,et al."Rapid localized flank inflation and implications for potential slope instability at Tungurahua volcano, Ecuador".Earth and Planetary Science Letters 534(2020).