Reduction of randomness in seismic noise as a short-term precursor to a volcanic eruption
Ambient seismic noise is characterized by randomness incurred by the random position and strength of the noise sources as well as the heterogeneous properties of the medium through which it propagates. Here we use ambient noise data recorded prior to the 1996 Gjálp eruption in Iceland in order to sh...
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ftpubmed:oai:pubmedcentral.nih.gov:5121890 2023-05-15T16:50:19+02:00 Reduction of randomness in seismic noise as a short-term precursor to a volcanic eruption Glynn, C. C. Konstantinou, K. I. 2016-11-24 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5121890/ http://www.ncbi.nlm.nih.gov/pubmed/27883050 https://doi.org/10.1038/srep37733 en eng Nature Publishing Group http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5121890/ http://www.ncbi.nlm.nih.gov/pubmed/27883050 http://dx.doi.org/10.1038/srep37733 Copyright © 2016, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ CC-BY Article Text 2016 ftpubmed https://doi.org/10.1038/srep37733 2016-12-04T01:30:45Z Ambient seismic noise is characterized by randomness incurred by the random position and strength of the noise sources as well as the heterogeneous properties of the medium through which it propagates. Here we use ambient noise data recorded prior to the 1996 Gjálp eruption in Iceland in order to show that a reduction of noise randomness can be a clear short-term precursor to volcanic activity. The eruption was preceded on 29 September 1996 by a Mw ~5.6 earthquake that occurred in the caldera rim of the Bárdarbunga volcano. A significant reduction of randomness started occurring 8 days before the earthquake and 10 days before the onset of the eruption. This reduction was observed even at stations more than 100 km away from the eruption site. Randomness increased to its previous levels 160 minutes after the Bárdarbunga earthquake, during which time aftershocks migrated from the Bárdarbunga caldera to a site near the Gjálp eruption fissure. We attribute this precursory reduction of randomness to the lack of higher frequencies (>1 Hz) in the noise wavefield caused by high absorption losses as hot magma ascended in the upper crust. Text Iceland PubMed Central (PMC) Scientific Reports 6 1 |
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Article Glynn, C. C. Konstantinou, K. I. Reduction of randomness in seismic noise as a short-term precursor to a volcanic eruption |
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Article |
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Ambient seismic noise is characterized by randomness incurred by the random position and strength of the noise sources as well as the heterogeneous properties of the medium through which it propagates. Here we use ambient noise data recorded prior to the 1996 Gjálp eruption in Iceland in order to show that a reduction of noise randomness can be a clear short-term precursor to volcanic activity. The eruption was preceded on 29 September 1996 by a Mw ~5.6 earthquake that occurred in the caldera rim of the Bárdarbunga volcano. A significant reduction of randomness started occurring 8 days before the earthquake and 10 days before the onset of the eruption. This reduction was observed even at stations more than 100 km away from the eruption site. Randomness increased to its previous levels 160 minutes after the Bárdarbunga earthquake, during which time aftershocks migrated from the Bárdarbunga caldera to a site near the Gjálp eruption fissure. We attribute this precursory reduction of randomness to the lack of higher frequencies (>1 Hz) in the noise wavefield caused by high absorption losses as hot magma ascended in the upper crust. |
format |
Text |
author |
Glynn, C. C. Konstantinou, K. I. |
author_facet |
Glynn, C. C. Konstantinou, K. I. |
author_sort |
Glynn, C. C. |
title |
Reduction of randomness in seismic noise as a short-term precursor to a volcanic eruption |
title_short |
Reduction of randomness in seismic noise as a short-term precursor to a volcanic eruption |
title_full |
Reduction of randomness in seismic noise as a short-term precursor to a volcanic eruption |
title_fullStr |
Reduction of randomness in seismic noise as a short-term precursor to a volcanic eruption |
title_full_unstemmed |
Reduction of randomness in seismic noise as a short-term precursor to a volcanic eruption |
title_sort |
reduction of randomness in seismic noise as a short-term precursor to a volcanic eruption |
publisher |
Nature Publishing Group |
publishDate |
2016 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5121890/ http://www.ncbi.nlm.nih.gov/pubmed/27883050 https://doi.org/10.1038/srep37733 |
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Iceland |
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Iceland |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5121890/ http://www.ncbi.nlm.nih.gov/pubmed/27883050 http://dx.doi.org/10.1038/srep37733 |
op_rights |
Copyright © 2016, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
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CC-BY |
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https://doi.org/10.1038/srep37733 |
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Scientific Reports |
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