| DOI: | 10.1002/2013GL057864
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| 论文题名: | Magma fracture and hybrid earthquakes in the conduit of Augustine Volcano |
| 作者: | Buurman H.; West M.E.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-8337
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| EISSN: | 1944-8068
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| 出版年: | 2013
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| 卷: | 40, 期:23 | | 起始页码: | 6038
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| 结束页码: | 6042
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| 语种: | 英语
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| 英文关键词: | earthquake migration
; hybrid earthquakes
; magma fracture
; volcano seismology
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| Scopus关键词: | Earthquake migration
; Magmatic explosion
; Seismic evidence
; Seismic waveforms
; Source location
; Volcanic earthquakes
; Volcano seismology
; Waveform characteristics
; Fracture
; Seismic waves
; Volcanoes
; Earthquakes
; earthquake
; fracture zone
; GPS
; lava
; magma
; migration
; P-wave
; seismology
; volcano
; Alaska
; Augustine
; Augustine Island
; United States
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| 英文摘要: | We exploit subtle but systematic shifts in seismic waveforms to examine a 2 h cluster of repeating hybrid volcanic earthquakes preceding the first magmatic explosions at Augustine Volcano in January 2006. We extract differential P wave traveltimes of <0.01 s to determine that the source locations migrated downward by approximately 35 m. Waveform characteristics, GPS observations, and visual reports of lava effusion at the summit suggest that the earthquakes were sourced by fracturing magma in the upper conduit. As the lava cooled and degassed at the surface, the conditions in the upper conduit changed causing the zone in which magma fracture could occur to move downward through the magma column. These changes may also have been the first indicators that the conduit was becoming choked, causing a buildup in pressure that resulted in the large magmatic explosions that followed 36 h later. Key Points Waveform evolution shows hypocenter migration Magma fracture zone migrates downwards in the conduit Seismic evidence for plugging a conduit ©2013. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84888805933&doi=10.1002%2f2013GL057864&partnerID=40&md5=86a2f94e33026e0c3decc2b3fb0ad638
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/5601
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Geophysical Institute, University of Alaska Fairbanks, 903 Koyukuk Dr., Fairbanks, AK 99775-7320, United States
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| Recommended Citation: | |
Buurman H.,West M.E.. Magma fracture and hybrid earthquakes in the conduit of Augustine Volcano[J]. Geophysical Research Letters,2013-01-01,40(23).
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