DOI: 10.1002/grl.50674
论文题名: Fluid ascent during the 2004-2005 unrest at Mt. Spurr inferred from seismic tomography
作者: Koulakov I. ; West M. ; Izbekov P.
刊名: Geophysical Research Letters
ISSN: 0094-8615
EISSN: 1944-8346
出版年: 2013
卷: 40, 期: 17 起始页码: 4579
结束页码: 4582
语种: 英语
英文关键词: magma source
; Mt. Spurr Volcano
; seismic tomography
; volatiles
Scopus关键词: Earthquake data
; Explosive eruption
; Magma sources
; Pressure build up
; Seismic networks
; Seismic tomography
; Tomographic inversion
; volatiles
; Seismographs
; Volcanoes
; Earthquakes
; crust
; earthquake
; magma
; seismic data
; seismic tomography
; volcanic eruption
; volcano
; Alaska
; United States
英文摘要: We present a seismic model of the crust beneath Mt. Spurr Volcano in Alaska based on tomographic inversion of local earthquake data recorded by temporary seismic network during the unrest of Mt. Spurr in 2004-2005. Beneath the northern vent of Mt. Spurr, where the most intensive fumarolic activity was observed during the last unrest, we observe a finger-shaped anomaly with a higher P and lower S velocity, which corresponds to high Vp/Vs ratio. Another anomaly is located to the south of Crater Peak approximately beneath the same location where an explosive eruption occurred in 1992. We propose that these two finger anomalies represent separated conduits of magma and volatiles. The NE conduit extends to the surface and enables free volatile flux. The SE conduit seems to be blocked at a ca. 20 km depth and in case of continuous pressure build up may become a source of an explosive eruption. Key Points Seismic model reveals the feeding paths of Mt. Spurr during the previous unrest Two separate finger-shaped anomalies delineate locations of volatile conduits The tops of the finger anomalies coincide with seismicity clusters ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84883454788&doi=10.1002%2fgrl.50674&partnerID=40&md5=afcb4ae5ac03483744b1087826e9532c
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5879
Appears in Collections: 气候减缓与适应
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作者单位: IPGG SB RAS, Prospekt Koptyuga 3, 630090 Novosibirsk, Russian Federation
Recommended Citation:
Koulakov I.,West M.,Izbekov P.. Fluid ascent during the 2004-2005 unrest at Mt. Spurr inferred from seismic tomography[J]. Geophysical Research Letters,2013-01-01,40(17).