Muller, C, Biggs, J, Ebmeier, SK orcid.org/0000-0002-5454-2652 et al. (5 more authors) (2018) Temporal Evolution of the Magmatic System at Tungurahua Volcano, Ecuador, detected by geodetic observations. Journal of Volcanology and Geothermal Research, 368. pp. 63-72. ISSN 0377-0273
Abstract
Changes in the pathway and timescale of magma ascent can be responsible for variations in eruptive style during long-lived eruptions, but are only documented at a small number of well-instrumented systems. Here we integrate PS-InSAR from high resolution TerraSAR-X radar imagery with continuous GPS data from 4 sites at Tungurahua volcano, Ecuador. Our results show long-term uplift between 2011 and 2014 associated with a continuously inflating prolate spheroid reservoir at a depth of ∼ 10 km beneath the summit. Comparisons with eruptive flux, taking compressibility into account, suggest that during this time period slightly over half the magma supplied to the system was erupted. The observations span three distinct phases of eruption and in 2012–2013, an increase in eruptive activity was accompanied by uplift on the volcano's western flank. Similar episodes have previously been observed during large Vulcanian eruptions and we attribute them to intrusions into an area of mechanical weakness. A localised patch of subsidence mid-way up the Tungurahua's western flank is co-located with a swarm of shallow long-period seismicity and may represent a potential site for a development of a lateral vent. This study demonstrates that satellite geodetic techniques are capable of characterising the geodetic signature of transitions in eruptive style during long-lived andesitic eruptions even where deformation is low magnitude and measurements are challenging.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | (c) 2018, Elsevier Ltd. All rights reserved. This is an author produced version of a paper published in Journal of Volcanology and Geothermal Research. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Tungurahua; volcano; InSAR; GPS; Statistical integration |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Inst of Geophysics and Tectonics (IGT) (Leeds) |
Funding Information: | Funder Grant number Leverhulme Trust ECF-2015-232 European Space Agency 4000118534/16/I-SBo |
Depositing User: | Symplectic Publications |
Date Deposited: | 08 Nov 2018 10:17 |
Last Modified: | 13 Nov 2019 01:38 |
Status: | Published |
Publisher: | Elsevier BV |
Identification Number: | 10.1016/j.jvolgeores.2018.11.004 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:138283 |