DOI: 10.1038/ngeo2146
论文题名: Volcanic drumbeat seismicity caused by stick-slip motion and magmatic frictional melting
作者: Kendrick J.E. ; Lavallée Y. ; Hirose T. ; Di Toro G. ; Hornby A.J. ; De Angelis S. ; Dingwell D.B.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期: 6 起始页码: 438
结束页码: 442
语种: 英语
Scopus关键词: dome
; friction
; magmatism
; melting
; seismicity
; solidification
; stick-slip
; volcanic eruption
; volcanism
; Cascade Range
; Leeward Islands [Lesser Antilles]
; Montserrat
; Mount Saint Helens
; Soufriere Hills Volcano
; United States
; Washington [United States]
英文摘要: During volcanic eruptions, domes of solidifying magma can form at the volcano summit. As magma ascends it often forms a plug bounded by discrete fault zones, a process accompanied by drumbeat seismicity. The repetitive nature of this seismicity has been attributed to stick-slip motion at fixed loci between the rising plug of magma and the conduit wall. However, the mechanisms for such periodic motion remain controversial. Here we simulate stick-slip motion in the laboratory using high-velocity rotary-shear experiments on magma-dome samples collected from Soufrière Hills Volcano, Montserrat, and Mount St Helens Volcano, USA. We frictionally slide the solid magma samples to generate slip analogous to movement between a magma plug and the conduit wall. We find that frictional melting is a common consequence of such slip. The melt acts as a viscous brake, so that the slip velocity wanes as melt forms. The melt then solidifies, followed by pressure build up, which allows fracture and slip to resume. Frictional melt therefore provides a feedback mechanism during the stick-slip process that can accentuate the cyclicity of such motion. We find that the viscosity of the frictional melt can help define the recurrence interval of stick-slip events. We conclude that magnitude, frequency and duration of drumbeat seismicity depend in part on the composition of the magma. © 2014 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106604
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Department of Earth, Ocean and Ecological Sciences, University of Liverpool, Liverpool L69 3GP, United Kingdom; Department of Earth and Environmental Sciences, Ludwig Maximilian University, Theresienstr. 41/III, 80333 Munich, Germany; Kochi Institute for Core Sample Research, JAMSTEC, Kochi 783-8502, Japan; Dipartimento di Geoscienze, Università degli Studi di Padova, Via Gradenigo 6, 35131 Padova, Italy; Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143 Rome, Italy
Recommended Citation:
Kendrick J.E.,Lavallée Y.,Hirose T.,et al. Volcanic drumbeat seismicity caused by stick-slip motion and magmatic frictional melting[J]. Nature Geoscience,2014-01-01,7(6)