| DOI: | 10.1016/j.epsl.2017.10.050
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| Scopus记录号: | 2-s2.0-85034076911
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| 论文题名: | Understanding cyclic seismicity and ground deformation patterns at volcanoes: Intriguing lessons from Tungurahua volcano, Ecuador |
| 作者: | Neuberg J.W.; Collinson A.S.D.; Mothes P.A.; C. Ruiz M.; Aguaiza S.
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| 刊名: | Earth and Planetary Science Letters
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| ISSN: | 0012821X
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| 出版年: | 2018
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| 卷: | 482 | | 起始页码: | 193
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| 结束页码: | 200
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| 语种: | 英语
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| 英文关键词: | anti-correlation
; eruption forecasting
; pressure
; seismicity
; shear stress
; tilt
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| Scopus关键词: | Deformation
; Numerical models
; Pressure
; Shear flow
; Shear stress
; Ground deformations
; Joint interpretation
; Magmatic plumbing system
; seismicity
; Shear stress partitioning
; tilt
; Volcanic activities
; Vulcanian explosions
; Volcanoes
; deformation
; magma
; pressure effect
; seismicity
; shear stress
; tilt
; volcanic eruption
; volcano
; Ecuador
; Tungurahua
; Tungurahua Volcano
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| 英文摘要: | Cyclic seismicity and ground deformation patterns are observed on many volcanoes worldwide where seismic swarms and the tilt of the volcanic flanks provide sensitive tools to assess the state of volcanic activity. Ground deformation at active volcanoes is often interpreted as pressure changes in a magmatic reservoir, and tilt is simply translated accordingly into inflation and deflation of such a reservoir. Tilt data recorded by an instrument in the summit area of Tungurahua volcano in Ecuador, however, show an intriguing and unexpected behaviour on several occasions: prior to a Vulcanian explosion when a pressurisation of the system would be expected, the tilt signal declines significantly, hence indicating depressurisation. At the same time, seismicity increases drastically. Envisaging that such a pattern could carry the potential to forecast Vulcanian explosions on Tungurahua, we use numerical modelling and reproduce the observed tilt patterns in both space and time. We demonstrate that the tilt signal can be more easily explained as caused by shear stress due to viscous flow resistance, rather than by pressurisation of the magmatic plumbing system. In general, our numerical models prove that if magma shear viscosity and ascent rate are high enough, the resulting shear stress is sufficient to generate a tilt signal as observed on Tungurahua. Furthermore, we address the interdependence of tilt and seismicity through shear stress partitioning and suggest that a joint interpretation of tilt and seismicity can shed new light on the eruption potential of silicic volcanoes. © 2017 Elsevier B.V. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/110109
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| 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: | School of Earth & Environment, The University of Leeds, Leeds, United Kingdom; Instituto Geofisico, Escuela Politécnica Nacional, Quito, Ecuador
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| Recommended Citation: | |
Neuberg J.W.,Collinson A.S.D.,Mothes P.A.,et al. Understanding cyclic seismicity and ground deformation patterns at volcanoes: Intriguing lessons from Tungurahua volcano, Ecuador[J]. Earth and Planetary Science Letters,2018-01-01,482
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