Quantifying strong seismic propagation effects in the upper volcanic edifice using sensitivity kernels

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Title: Quantifying strong seismic propagation effects in the upper volcanic edifice using sensitivity kernels
Authors: Martínez Montesinos, BeatrizBean, Christopher J.Lokmer, Ivan
Permanent link: http://hdl.handle.net/10197/12470
Date: 15-Jan-2021
Online since: 2021-09-14T10:58:08Z
Abstract: In volcanic environments, the correct interpretation of the signals recorded by a seismic station is critical for a determination of the internal state of the volcano. Those signals contain information about both the seismic source and the properties of the path travelled by the seismic wave. Therefore, understanding the path effect is necessary for both source inversions and geophysical investigation of the volcanoes' properties at depth. We present an application of the seismic adjoint methodology and sensitivity kernel analysis to investigate seismic wave propagation effects in the upper volcanic edifice. We do this by performing systematic numerical simulations to calculate synthetic seismograms in two-dimensional models of Mount Etna, Italy, considering different wave velocity properties. We investigate the relationship between different portions of a seismogram and different parts of the structural volcano model. In particular, we examine the influence of known near-surface low-velocity volcanic structure on the recorded seismic signals. Results improve our ability to understand path effects highlighting the importance of the shallowest velocity structure in shaping the recorded seismograms and support recent studies that show that, although long-period seismic events are commonly associated with magma movements in resonant conduits, these events can be reproduced without the presence of fluids. We conclude that edifice heterogeneities impart key signatures on volcano seismic traces that must be considered when investigating volcano seismic sources.
Funding Details: European Commission - Seventh Framework Programme (FP7)
Type of material: Journal Article
Publisher: Elsevier
Journal: Earth and Planetary Science Letters
Volume: 554
Copyright (published version): 2020 the Authors
Keywords: Volcanic edificeNear surface volcano structureNumerical seismic simulationsVolcano seismic sourcesSensitivity kernels
DOI: 10.1016/j.epsl.2020.116683
Language: en
Status of Item: Peer reviewed
ISSN: 0012-821X
This item is made available under a Creative Commons License: https://creativecommons.org/licenses/by/3.0/ie/
Appears in Collections:Earth Sciences Research Collection

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