DOI: 10.1002/grl.50833
论文题名: Using numerical modeling to explore the origin of intrusion patterns on Fernandina volcano, Galapagos Islands, Ecuador
作者: Chestler S.R. ; Grosfils E.B.
刊名: Geophysical Research Letters
ISSN: 0094-8620
EISSN: 1944-8351
出版年: 2013
卷: 40, 期: 17 起始页码: 4565
结束页码: 4569
语种: 英语
英文关键词: dikes
; edifice
; finite element models
; Galapagos Islands
; radial intrusions
; reservoir
Scopus关键词: edifice
; Field observations
; Galapagos Islands
; Intrusion patterns
; Point of rupture
; Propagation axis
; radial intrusions
; Surface displacement
; Aspect ratio
; Buildings
; Finite element method
; Geodetic satellites
; Geometry
; Levees
; Reservoirs (water)
; Volcanoes
; data acquisition
; dike
; emplacement
; finite element method
; igneous intrusion
; magma chamber
; numerical model
; reservoir
; rupture
; stress field
; surface
; volcano
; Ecuador
; Fernandina
; Galapagos Islands
英文摘要: Using parameterized finite element models, we investigate the emplacement of both radial and circumferential intrusions in the configuration observed at Fernandina volcano in the Galapagos Islands. When situated within the edifice at depths consistent with petrological and surface displacement data, inflation of a mildly oblate magma reservoir to the point of rupture can initiate either radial or circumferential intrusions in response to minor, volcanologically plausible variations in reservoir geometry (i.e., aspect ratio). In addition, more oblate reservoirs inject lateral sills into an inflation-derived stress field consistent with rotation about their propagation axis to form gently dipping radial dikes, a mode of behavior recently inferred from InSAR data at Fernandina. All three styles of intrusion occur in near-surface configurations consistent with field observations. Key Points Reservoir depth and geometry affect edifice stress state and intrusion geometry Radially oriented dikes can initiate directly from a shallow oblate reservoir We can match intrusion geometries observed on Galapagos Island volcanoes ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84883446757&doi=10.1002%2fgrl.50833&partnerID=40&md5=786c9f81dac0f8b06b68de3db30ce8ea
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5884
Appears in Collections: 气候减缓与适应
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作者单位: Geology Department, Pomona College, Claremont, CA, United States
Recommended Citation:
Chestler S.R.,Grosfils E.B.. Using numerical modeling to explore the origin of intrusion patterns on Fernandina volcano, Galapagos Islands, Ecuador[J]. Geophysical Research Letters,2013-01-01,40(17).