globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2018.09.023
Scopus ID: 2-s2.0-85054096039
Necking and fracking may explain stationary seismicity and full degassing in volcanic silicic spine extrusion
Author: Jiao L.; Tapponnier P.; Costa F.; Donzé F.-V.; Scholtès L.; Taisne B.; Wei S.
Source Publication: Earth and Planetary Science Letters
ISSN: 0012821X
Publishing Year: 2018
Volume: 503
pages begin: 47
pages end: 57
Language: 英语
Keyword: conduit necking ; DEM modeling ; spine extrusion ; volcanic seismicity
Scopus Keyword: Bottles ; Degassing ; Ductile fracture ; Hydraulic fracturing ; Metal extrusion ; Metal working ; Strike-slip faults ; Tensile strength ; Volcanoes ; conduit necking ; DEM models ; Discrete element modeling ; Fault plane solutions ; High temperature ; Industrial metals ; Nucleation and growth ; volcanic seismicity ; Fault slips
English Abstract: Volcanic seismicity during silicic spine eruptions often involves recurrent excitation of similar sources at stationary depth just beneath the crater. The mechanics of volcanic spine extrusion may be compared to those of high-temperature, industrial metal working. We thus use slip-line field theory to assess stress, strain and faulting in ascending magma, which, although hot, behaves as a solid. Earthquake fault-plane solutions during the 09/2004–08/2005 eruptions of Mount St. Helens are generally consistent with shrinking of magma rising across a conduit “bottle-neck”. Among 215 fault plane solutions, thrust and vertical fault planes prevail, with fewer normal or strike-slip faults. Constriction across the neck and vertical shear along the conduit walls thus predominate. Dynamic Discrete Element Modeling reproduces repetitive nucleation and growth of thrust faults within such a neck. The pressure drop across the neck's core (secondary tension) boosts crack opening and hence gas extraction. Such natural “fracking” could promote full magma degassing, contributing to the typically low explosivity of silicic spine extrusion. © 2018 The Author(s)
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被引频次[WOS]:2   [查看WOS记录]     [查看WOS中相关记录]
Document Type: 期刊论文
Appears in Collections:影响、适应和脆弱性

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Affiliation: Earth Observatory of Singapore, Nanyang Technological University, Singapore; Université Grenoble Alpes, Institut des Sciences de la Terre, Grenoble, France; Université de Lorraine, Lab. GeoRessources, Nancy, France

Recommended Citation:
Jiao L.,Tapponnier P.,Costa F.,et al. Necking and fracking may explain stationary seismicity and full degassing in volcanic silicic spine extrusion[J]. Earth and Planetary Science Letters,2018-01-01,503
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