DOI: 10.1002/grl.50899
论文题名: Tomographic image of melt storage beneath Askja Volcano, Iceland using local microseismicity
作者: Mitchell M.A. ; White R.S. ; Roecker S. ; Greenfield T.
刊名: Geophysical Research Letters
ISSN: 0094-8523
EISSN: 1944-8254
出版年: 2013
卷: 40, 期: 19 起始页码: 5040
结束页码: 5046
语种: 英语
英文关键词: Askja
; earthquake tomography
; Iceland
; volcano seismology
Scopus关键词: Askja
; Background value
; Close proximity
; Icelands
; Low-velocity anomaly
; Magma migration
; Tomographic images
; Volcano seismology
; Earthquakes
; Seismic waves
; Tomography
; Velocity
; Volcanoes
; caldera
; geodetic network
; gravity survey
; low velocity zone
; magma chamber
; P-wave
; S-wave
; seismicity
; seismology
; sill
; tomography
; Askja
; Iceland
英文摘要: We use P wave and S wave arrivals from microseismic earthquakes to construct 3-D tomographic Vp and Vs images of the magma storage region beneath Askja's central volcano in the Northern Volcanic Zone of Iceland. A distinctive ellipsoidal low-velocity anomaly, with both Vp and Vsvelocities 8-12% below the background, is imaged at 6-11 km depth beneath the caldera. The presence of a shallow magma chamber is corroborated by geodetic and gravity studies. The small Vp/V s anomaly suggests a lack of pervasive melt. We interpret this anomaly as a region of multiple sills, some frozen but hot, others containing partial melt. A second, smaller low-velocity anomaly beneath the main magma storage region may represent a magma migration pathway. This interpretation is supported by the close proximity to the anomaly of clusters of deep, magmatically induced earthquakes. However, the location and shape of this deep anomaly are poorly constrained by the current data set. Key Points We image a sub-caldera low velocity anomaly that extends from 6-11 km in depth Within the anomaly both Vp and Vs velocities are 8-12% below background values Anomaly due to hot, sub-solidus rock with melt distributed in many small sills ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84884856464&doi=10.1002%2fgrl.50899&partnerID=40&md5=19afed33be652bb4444123a036acef65
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5787
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth Sciences, Bullard Laboratories, University of Cambridge, Cambridge, United Kingdom
Recommended Citation:
Mitchell M.A.,White R.S.,Roecker S.,et al. Tomographic image of melt storage beneath Askja Volcano, Iceland using local microseismicity[J]. Geophysical Research Letters,2013-01-01,40(19).