Tomographic image of melt storage beneath Askja Volcano, Iceland using local microseismicity
Tomographic image of melt storage beneath Askja Volcano, Iceland using local microseismicity
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/Vs 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.
earthquake tomography, volcano seismology, Iceland, Askja
5040-5046
Mitchell, Michael A.
dfeefa2c-a466-4012-ad68-a1d25e846810
White, Robert S.
80949343-6d64-42e3-acb2-812307f1b274
Roecker, Steve
c571eb6e-5731-48ad-b5b6-05e1cd432ee9
Greenfield, Timothy
be593d17-54a8-4c18-ac57-9ce1bfe3920f
16 October 2013
Mitchell, Michael A.
dfeefa2c-a466-4012-ad68-a1d25e846810
White, Robert S.
80949343-6d64-42e3-acb2-812307f1b274
Roecker, Steve
c571eb6e-5731-48ad-b5b6-05e1cd432ee9
Greenfield, Timothy
be593d17-54a8-4c18-ac57-9ce1bfe3920f
Mitchell, Michael A., White, Robert S., Roecker, Steve and Greenfield, Timothy
(2013)
Tomographic image of melt storage beneath Askja Volcano, Iceland using local microseismicity.
Geophysical Research Letters, 40 (19), .
(doi:10.1002/grl.50899).
Abstract
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/Vs 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.
Text
Mitchell et al. - 2013 - Tomographic image of melt storage beneath Askja Volcano, Iceland using local microseismicity.pdf
- Version of Record
More information
Published date: 16 October 2013
Keywords:
earthquake tomography, volcano seismology, Iceland, Askja
Organisations:
Geology & Geophysics
Identifiers
Local EPrints ID: 401272
URI: http://eprints.soton.ac.uk/id/eprint/401272
ISSN: 0094-8276
PURE UUID: e8759b3c-a317-4ef4-8185-9f2d10a757cf
Catalogue record
Date deposited: 07 Oct 2016 09:37
Last modified: 15 Mar 2024 02:43
Export record
Altmetrics
Contributors
Author:
Michael A. Mitchell
Author:
Robert S. White
Author:
Steve Roecker
Author:
Timothy Greenfield
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics