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Shallow structure beneath the Central Volcanic Complex of Tenerife from new gravity data: implications for its evolution and recent reactivation

Gottsmann, J.; Camacho, A. G.; Marti, J.; Wooller, L.; Fernandez, J.; Garcia, A. and Rymer, H. (2008). Shallow structure beneath the Central Volcanic Complex of Tenerife from new gravity data: implications for its evolution and recent reactivation. Physics of the Earth and Planetary Interiors, 168(3-4) pp. 212–230.

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DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1016/j.pepi.2008.06.020
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Abstract

We present a new local Bouguer anomaly map of the Central Volcanic Complex (CVC) of Tenerife, Spain, constructed from the amalgamation of 323 new high precision gravity measurements with existing gravity data from 361 observations. The new anomaly map images the high-density core of the CVC and the pronounced gravity low centred in the Las Cañadas caldera in greater detail than previously available. Mathematical construction of a sub-surface model from the local anomaly data, employing a 3D inversion based on 'growing' the sub-surface density distribution via the aggregation of cells, enables mapping of the shallow structure beneath the complex, giving unprecedented insights into the sub-surface architecture. We find the resultant density distribution in agreement with geological and other geophysical data. The modelled sub-surface structure supports a vertical collapse origin of the caldera, and maps the headwall of the ca. 180 ka Icod landslide, which appears to lie buried beneath the Pico Viejo–Pico Teide stratovolcanic complex. The results allow us to put into context the recorded ground deformation and gravity changes at the CVC during its reactivation in spring 2004 in relation to its dominant structural building blocks. For example, the areas undergoing the most significant changes at depth in recent years are underlain by low-density material and are aligned along long-standing structural entities, which have shaped this volcanic ocean island over the past few million years.

Item Type: Journal Article
Copyright Holders: 2008 Elsevier B.V.
ISSN: 0031-9201
Extra Information: NOTICE: this is the author’s version of a work that was accepted for publication in Physics of the Earth and Planetary Interiors Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Physics of the Earth and Planetary Interiors, 168(3-4), 2008 10.1016/j.pepi.2008.06.020
Keywords: Gravity; Structure; Caldera; Tenerife; Volcanic ocean island
Academic Unit/Department: Science
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 15479
Depositing User: Hazel Rymer
Date Deposited: 27 Mar 2009 09:54
Last Modified: 04 Nov 2013 22:44
URI: http://oro.open.ac.uk/id/eprint/15479
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