Self-sustained vibrations in volcanic areas extracted by Independent Component Analysis: a review and new results
We investigate the physical processes associated with volcanic tremor and explosions. A volcano is a complex system where a fluid source interacts with the solid edifice so generating seismic waves in a regime of low turbulence. Although the complex behavior escapes a simple universal description, t...
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ftcopernicus:oai:publications.copernicus.org:npg11691 2023-05-15T13:36:36+02:00 Self-sustained vibrations in volcanic areas extracted by Independent Component Analysis: a review and new results Lauro, E. Martino, S. Falanga, M. Palo, M. 2018-10-09 application/pdf https://doi.org/10.5194/npg-18-925-2011 https://npg.copernicus.org/articles/18/925/2011/ eng eng doi:10.5194/npg-18-925-2011 https://npg.copernicus.org/articles/18/925/2011/ eISSN: 1607-7946 Text 2018 ftcopernicus https://doi.org/10.5194/npg-18-925-2011 2020-07-20T16:25:57Z We investigate the physical processes associated with volcanic tremor and explosions. A volcano is a complex system where a fluid source interacts with the solid edifice so generating seismic waves in a regime of low turbulence. Although the complex behavior escapes a simple universal description, the phases of activity generate stable (self-sustained) oscillations that can be described as a non-linear dynamical system of low dimensionality. So, the system requires to be investigated with non-linear methods able to individuate, decompose, and extract the main characteristics of the phenomenon. Independent Component Analysis (ICA), an entropy-based technique is a good candidate for this purpose. Here, we review the results of ICA applied to seismic signals acquired in some volcanic areas. We emphasize analogies and differences among the self-oscillations individuated in three cases: Stromboli (Italy), Erebus (Antarctica) and Volcán de Colima (Mexico). The waveforms of the extracted independent components are specific for each volcano, whereas the similarity can be ascribed to a very general common source mechanism involving the interaction between gas/magma flow and solid structures (the volcanic edifice). Indeed, chocking phenomena or inhomogeneities in the volcanic cavity can play the same role in generating self-oscillations as the languid and the reed do in musical instruments. The understanding of these background oscillations is relevant not only for explaining the volcanic source process and to make a forecast into the future, but sheds light on the physics of complex systems developing low turbulence. Text Antarc* Antarctica Copernicus Publications: E-Journals Nonlinear Processes in Geophysics 18 6 925 940 |
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Copernicus Publications: E-Journals |
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English |
description |
We investigate the physical processes associated with volcanic tremor and explosions. A volcano is a complex system where a fluid source interacts with the solid edifice so generating seismic waves in a regime of low turbulence. Although the complex behavior escapes a simple universal description, the phases of activity generate stable (self-sustained) oscillations that can be described as a non-linear dynamical system of low dimensionality. So, the system requires to be investigated with non-linear methods able to individuate, decompose, and extract the main characteristics of the phenomenon. Independent Component Analysis (ICA), an entropy-based technique is a good candidate for this purpose. Here, we review the results of ICA applied to seismic signals acquired in some volcanic areas. We emphasize analogies and differences among the self-oscillations individuated in three cases: Stromboli (Italy), Erebus (Antarctica) and Volcán de Colima (Mexico). The waveforms of the extracted independent components are specific for each volcano, whereas the similarity can be ascribed to a very general common source mechanism involving the interaction between gas/magma flow and solid structures (the volcanic edifice). Indeed, chocking phenomena or inhomogeneities in the volcanic cavity can play the same role in generating self-oscillations as the languid and the reed do in musical instruments. The understanding of these background oscillations is relevant not only for explaining the volcanic source process and to make a forecast into the future, but sheds light on the physics of complex systems developing low turbulence. |
format |
Text |
author |
Lauro, E. Martino, S. Falanga, M. Palo, M. |
spellingShingle |
Lauro, E. Martino, S. Falanga, M. Palo, M. Self-sustained vibrations in volcanic areas extracted by Independent Component Analysis: a review and new results |
author_facet |
Lauro, E. Martino, S. Falanga, M. Palo, M. |
author_sort |
Lauro, E. |
title |
Self-sustained vibrations in volcanic areas extracted by Independent Component Analysis: a review and new results |
title_short |
Self-sustained vibrations in volcanic areas extracted by Independent Component Analysis: a review and new results |
title_full |
Self-sustained vibrations in volcanic areas extracted by Independent Component Analysis: a review and new results |
title_fullStr |
Self-sustained vibrations in volcanic areas extracted by Independent Component Analysis: a review and new results |
title_full_unstemmed |
Self-sustained vibrations in volcanic areas extracted by Independent Component Analysis: a review and new results |
title_sort |
self-sustained vibrations in volcanic areas extracted by independent component analysis: a review and new results |
publishDate |
2018 |
url |
https://doi.org/10.5194/npg-18-925-2011 https://npg.copernicus.org/articles/18/925/2011/ |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
eISSN: 1607-7946 |
op_relation |
doi:10.5194/npg-18-925-2011 https://npg.copernicus.org/articles/18/925/2011/ |
op_doi |
https://doi.org/10.5194/npg-18-925-2011 |
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Nonlinear Processes in Geophysics |
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18 |
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6 |
container_start_page |
925 |
op_container_end_page |
940 |
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1766081250831892480 |