dc.contributor.author | Hickey, J | |
dc.contributor.author | Gottsmann, J | |
dc.contributor.author | Mothes, P | |
dc.date.accessioned | 2016-09-19T10:04:39Z | |
dc.date.issued | 2015-03-12 | |
dc.description.abstract | Deformation at Cotopaxi was observed between 2001 and 2002 along with recorded seismicity
beneath the northeast (NE) flank, despite the fact that the last eruption occurred in 1942. We use electronic
distance meter deformation data along with the patterns of recorded seismicity to constrain the cause of
this unrest episode. To solve for the optimum deformation source parameters we employ inverse finite
element (FE) models that account for material heterogeneities and surface topography. For a range of source
shapes the models converge on a shallow reservoir beneath the southwest (SW) flank. The individual best fit
model is a small oblate-shaped source, approximately 4–5 km beneath the summit, with a volume increase
of roughly 20 × 106 m3. This SW source location contrasts with the NE seismicity locations. Subsequently,
further FE models that additionally account for temperature-dependent viscoelasticity are used to reconcile
the deformation and seismicity simultaneously. Comparisons of elastic and viscous timescales allude to
aseismic pressurization of a small magma reservoir in the SW. Seismicity in the NE is then explained through
a mechanism of fluid migration from the SW to the NE along fault systems. We extend our analyses to
further show that if future unrest crises are accompanied by measurable seismicity around the deformation
source, this could indicate a higher magma supply rate and increased likelihood of a forthcoming eruption. | en_GB |
dc.description.sponsorship | The data informing this paper is
available upon request to the lead
author. This work was supported by
the European Commission, Framework
Program 7 (grant 282759, VUELCO,
and grant 308665, MEDSUV), the
Natural Environmental Research
Council (NE/G01843X/1), and the
Royal Society (UF090006). We thank
reviewers A. Gudmundsson and
L. Crescentini, and Editor A. Revil,
for their comments which helped to
improve the paper. We also thank Mark
Jellinek for thoughtful discussions
during manuscript preparation. | en_GB |
dc.identifier.citation | Vol. 120; doi: 10.1002/2014JB011731 | en_GB |
dc.identifier.doi | 10.1002/2014JB011731 | |
dc.identifier.uri | http://hdl.handle.net/10871/23513 | |
dc.language.iso | en | en_GB |
dc.publisher | American Geophysical Union (AGU) | en_GB |
dc.rights | This is an open access article under
the terms of the Creative Commons
Attribution License, which permits use,
distribution and reproduction in any
medium, provided the original work is
properly cited. | en_GB |
dc.title | Estimating volcanic deformation source parameters with a Finite Element inversion: the 2001-2002 unrest at Cotopaxi volcano, Ecuador | en_GB |
dc.type | Article | en_GB |
dc.date.available | 2016-09-19T10:04:39Z | |
dc.identifier.issn | 2169-9313 | |
dc.description | This is the final version of the article. Available from the publisher via the DOI in this record. | en_GB |
dc.identifier.journal | Journal of Geophysical Research. Solid Earth | en_GB |