Marsden, LH orcid.org/0000-0002-9746-544X, Neuberg, JW orcid.org/0000-0001-7866-0736 and Thomas, ME orcid.org/0000-0002-1300-177X (2019) Topography and Tilt at Volcanoes. Frontiers in Earth Science, 7. 317. ISSN 2296-6463
Abstract
For optimal monitoring of the deformation of a volcano, instrumentation should be deployed at the location most sensitive to changes at the suspected deformation source. The topographic effect on tilt depends strongly on the orientation of the deformation field relative to the surface on which the instrument is deployed. This fact has long been understood and corrected for in tilt measurements related to body tides and referred to as “cavity” or “topographic effects” (Harrison, 1976). Despite this, and whilst topography at volcanoes is often significant, until now the topographic effect on tilt at volcanoes has not been systematically explored. Here, we investigate the topographic effect on tilt produced by either the pressurization of a reservoir or conduit, or shear stress as magma ascends through a conduit, using 2D axisymmetric and 3D finite element deformation modeling. We show that topography alone can amplify or reduce the tilt by more than an order of magnitude, and control the orientation of the maximum tilt. Therefore, a decrease in tilt can even be caused by an increase in deformation at the source. Hence, inverting for the source stress using simple analytical models that neglect topography could potentially lead to a misinterpretation of how the volcanic system is evolving. Since topographic features can amplify the tilt signal, they can be exploited when deciding upon an installation site.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019 Marsden, Neuberg and Thomas. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0) (https://creativecommons.org/licenses/by/4.0/). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. |
Keywords: | topography; tilt; shear stress; pressure; numerical modeling; volcano |
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 NERC (Natural Environment Research Council) No External Reference |
Depositing User: | Symplectic Publications |
Date Deposited: | 07 Jan 2020 11:37 |
Last Modified: | 08 Feb 2021 15:21 |
Status: | Published |
Publisher: | Frontiers Media |
Identification Number: | 10.3389/feart.2019.00317 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:155278 |
Commentary/Response Threads
- Marsden, LH, Neuberg, JW and Thomas, ME Topography and Tilt at Volcanoes. (deposited 07 Jan 2020 11:37) [Currently Displayed]