DOI: 10.1002/grl.50284
论文题名: Aspect ratios and magma overpressures of non-feeder dikes observed in the Miyake-jima volcano (Japan), and fracture toughness of its upper part
作者: Kusumoto S. ; Geshi N. ; Gudmundsson A.
刊名: Geophysical Research Letters
ISSN: 0094-9222
EISSN: 1944-8953
出版年: 2013
卷: 40, 期: 6 起始页码: 1065
结束页码: 1068
语种: 英语
英文关键词: aspect ratios of dikes
; fracture toughness
; magma overpressure
; non-feeder dikes
Scopus关键词: Host rocks
; Keypoints
; Maximum thickness
; Over-pressures
; Overpressure
; Aspect ratio
; Estimation
; Feeding
; Fracture toughness
; Volcanoes
; Levees
; dike
; fracture toughness
; magma
; magmatic differentiation
; observational method
; pressure effect
; Chubu
; Honshu
; Izu Islands
; Japan
; Miyakejima
; Shizuoka [Chubu]
英文摘要: We present a new method for estimating the length and maximum thickness (aperture) of a dike from the observed opening at one dike tip. We apply the method to 15 arrested non-feeder dikes (where the upper tip is known, the lower tip unknown) in the caldera walls of Miyake-jima, Japan, to estimate the length-thickness ratio, as well as the magma overpressure and fracture toughness. The calculated length-thickness ratio ranges from 61 to 246, with an average of 136. The ratios are low because the dikes are emplaced close to the surface in comparatively compliant (soft) rocks. Using these ratios and the appropriate elastic constants, the calculated magmatic overpressures of the dikes are between 2.3 and 8.9 MPa, and the stress intensity factors between 38 and 117 MPa m1/2. All these values are within the range of typical in situ estimates, supporting the validity of this new method. Key Points Magma overpressures of non-feeder dikes in Miyake-jima are less than 9 MPa Aspect ratios of dike reflect intrusion environment and host rock propertie Successful evaluation of the fracture toughness of the Miyake-jima volcano. ©2013 American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84876894380&doi=10.1002%2fgrl.50284&partnerID=40&md5=28e321ce6927c80e00d2c92543a7a84f
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6486
Appears in Collections: 气候减缓与适应
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作者单位: Graduate School of Science and Engineering for Research, University of Toyama, 3190 Gofuku, Toyama Toyama-shi 930-8555, Japan
Recommended Citation:
Kusumoto S.,Geshi N.,Gudmundsson A.. Aspect ratios and magma overpressures of non-feeder dikes observed in the Miyake-jima volcano (Japan), and fracture toughness of its upper part[J]. Geophysical Research Letters,2013-01-01,40(6).