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DOI | 10.1029/2019GL086230 |
Logarithmic Growth of Dikes Froma Depressurizing Magma Chamber | |
Grossman-Ponemon, Benjamin E.1; Heimisson, Elias R.2,3; Lew, Adrian J.1,4; Segall, Paul2 | |
2020-02-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2020 |
卷号 | 47期号:4 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Dike propagation is an intrinsically multiphase problem, where deformation and fluid flow are intricately coupled in a fracture process. Here we perform the first fully coupled simulations of dike propagation in two dimensions, accounting for depressurization of a circular magma chamber, dynamic fluid flow, fracture formation, and elastic deformation. Despite the complexity of the governing equations, we observe that the lengthening is well explained by a simple model a(t) = c(1) log(1 + t/c(2)), where a is the dike length, t is time, and c(1) and c(2) are constants. We compare the model to seismic data from eight dikes in Iceland and Ethiopia, and, in spite of the assumption of plane strain, we find good agreement between the data and the model. In addition, we derive an approximate model for the depressurization of the chamber with the dike length. These models may help forecast the growth of lateral dikes and magma chamber depressurization. Plain Language Summary Volcanic dike intrusions, propagating magma-filled fractures, precede most eruptions. Dike propagation has been studied for decades through simplified analytical and numerical models. To date, no study has fully addressed how the fluid magma, host rock, and the magma chamber all interact at the same time and drive the dike forward. We present such simulations for a two-dimensional configuration and deduce that a simple formula can explain how the dike lengthens with time. We suggest that this simple formula may be used to forecast dike growth. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000529120100064 |
WOS关键词 | INDUCED EARTHQUAKES ; HYDRAULIC FRACTURE ; MECHANICAL MODELS ; PLANE-STRAIN ; PROPAGATION ; DEFLATION ; INTRUSION ; BOREHOLE ; CENTERS ; VOLCANO |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/279672 |
专题 | 气候变化 |
作者单位 | 1.Stanford Univ, Dept Mech Engn, Stanford, CA 94305 USA; 2.Stanford Univ, Dept Geophys, Stanford, CA 94305 USA; 3.CALTECH, Seismol Lab, Pasadena, CA 91125 USA; 4.Stanford Univ, Inst Computat & Math Engn, Stanford, CA 94305 USA |
推荐引用方式 GB/T 7714 | Grossman-Ponemon, Benjamin E.,Heimisson, Elias R.,Lew, Adrian J.,et al. Logarithmic Growth of Dikes Froma Depressurizing Magma Chamber[J]. GEOPHYSICAL RESEARCH LETTERS,2020,47(4). |
APA | Grossman-Ponemon, Benjamin E.,Heimisson, Elias R.,Lew, Adrian J.,&Segall, Paul.(2020).Logarithmic Growth of Dikes Froma Depressurizing Magma Chamber.GEOPHYSICAL RESEARCH LETTERS,47(4). |
MLA | Grossman-Ponemon, Benjamin E.,et al."Logarithmic Growth of Dikes Froma Depressurizing Magma Chamber".GEOPHYSICAL RESEARCH LETTERS 47.4(2020). |
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