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Imaging magma storage below Teide volcano (Tenerife) using scattered seismic wavefields
Date Issued
2012-11
Date Available
2014-06-18T14:31:44Z
Abstract
Tenerife (Canary Islands, Spain) is a volcanic island dominated by the Teide-Pico Viejo complex, with a summit height of 3718 m. After renewed signs of activity starting in 2004, an active seismic experiment was performed in 2007 to derive a tomographic model and identify seismic anomalies possibly associated with the magmatic system. To complement the tomography, a double beam-forming analysis is applied on two orthogonal 2-D profiles crossing the island to look for evidence of the existence of a magma chamber. Numerical tests allow us to investigate the best measure of coherency between traces, and show that the correlation and nth root semblance methods give better results than the classical semblance. They also demonstrate that the technique is reliable for locating scattering structures at depth, even when the velocity model is imperfect. Applying this technique to the Tenerife data set, two main anomalies can be identified: one at approximately 7–9 km b.s.l. depth in the northern part of the island, and one shallower (1–4 km b.s.l.) beneath the main summit. These structures could be linked to the magmatic system, in good agreement with previous studies. The shallowest one may be the phonolitic storage area feeding the Teide-Pico Viejo complex, while the deepest structure may be related to the basaltic system.
Sponsorship
Science Foundation Ireland
Other Sponsorship
Spanish Projects
SEIS-UK
National Environment Research Council
Department of Communications, Energy and Natural Resources
National Geosciences Programme 2007-2013
Type of Material
Journal Article
Publisher
Oxford University Press
Journal
Geophysical Journal International
Volume
191
Issue
2
Start Page
695
End Page
706
Copyright (Published Version)
2012 the authors, 2012 The Royal Astronomical Society
Language
English
Status of Item
Peer reviewed
This item is made available under a Creative Commons License
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