DOI: 10.1002/2014GL061310
论文题名: Explosive dome eruptions modulated by periodic gas-driven inflation
作者: Johnson J.B. ; Lyons J.J. ; Andrews B.J. ; Lees J.M.
刊名: Geophysical Research Letters
ISSN: 0094-9768
EISSN: 1944-9499
出版年: 2014
卷: 41, 期: 19 起始页码: 6689
结束页码: 6697
语种: 英语
英文关键词: eruption dynamics
; volcano inflation
; volcano infrasound
; volcano seismology
Scopus关键词: Volcanoes
; Conduit systems
; Dome eruptions
; Gas fluxing
; Gas reservoir
; Inflation rates
; Infrasound
; Shallow reservoirs
; Volcano seismology
; Gases
; gas flow
; pressure field
; tilt
; venting
; volcanic eruption
; volcanology
; Gauteng
; South Africa
英文摘要: Volcan Santiaguito (Guatemala) "breathes" with extraordinary regularity as the edifice's conduit system accumulates free gas, which periodically vents to the atmosphere. Periodic pressurization controls explosion timing, which nearly always occurs at peak inflation, as detected with tiltmeters. Tilt cycles in January 2012 reveal regular 26 ± 6 min inflation/deflation cycles corresponding to at least ~101 kg/s of gas fluxing the system. Very long period (VLP) earthquakes presage explosions and occur during cycles when inflation rates are most rapid. VLPs locate ~300 m below the vent and indicate mobilization of volatiles, which ascend at ~50 m/s. Rapid gas ascent feeds pyroclast-laden eruptions lasting several minutes and rising to ~1 km. VLPs are not observed during less rapid inflation episodes; instead, gas vents passively through the conduit producing no infrasound and no explosion. These observations intimate that steady gas exsolution and accumulation in shallow reservoirs may drive inflation cycles at open-vent silicic volcanoes. Key Points Regular 26 min inflation/deflation cycles are observed at silicic volcanoInflation rates control whether volcano explodes or passively degassesLocation of gas reservoir and flux of gas through the volcano are quantified ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84911092513&doi=10.1002%2f2014GL061310&partnerID=40&md5=0cd272f38bac431190994dcf2430261e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7032
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geosciences, Boise State University, Boise, ID, United States
Recommended Citation:
Johnson J.B.,Lyons J.J.,Andrews B.J.,et al. Explosive dome eruptions modulated by periodic gas-driven inflation[J]. Geophysical Research Letters,2014-01-01,41(19).