Deciphering the Whisper of Volcanoes: Monitoring Velocity Changes at Kamchatka's Klyuchevskoy Group With Fluctuating Noise Fields
Volcanic inflation and deflation often precede eruptions and can lead to seismic velocity changes (dv/v $dv/v$) in the subsurface. Recently, interferometry on the coda of ambient noise‐cross‐correlation functions yielded encouraging results in detecting these changes at active volcanoes. Here, we an...
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ftfuberlin:oai:refubium.fu-berlin.de:fub188/39028 2023-06-11T04:13:36+02:00 Deciphering the Whisper of Volcanoes: Monitoring Velocity Changes at Kamchatka's Klyuchevskoy Group With Fluctuating Noise Fields Makus, Peter Sens‐Schönfelder, Christoph Illien, Luc Walter, Thomas R. Yates, Alexander Tilmann, Frederik 2023 21 Seiten application/pdf https://refubium.fu-berlin.de/handle/fub188/39028 https://doi.org/10.17169/refubium-38744 https://doi.org/10.1029/2022JB025738 eng eng https://refubium.fu-berlin.de/handle/fub188/39028 http://dx.doi.org/10.17169/refubium-38744 doi:10.1029/2022JB025738 This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes. https://creativecommons.org/licenses/by-nc/4.0/ seismology volcano monitoring machine learning ambient noise seismic velocity change time varying earth structure ddc:550 doc-type:article 2023 ftfuberlin https://doi.org/10.17169/refubium-3874410.1029/2022JB025738 2023-04-23T22:24:18Z Volcanic inflation and deflation often precede eruptions and can lead to seismic velocity changes (dv/v $dv/v$) in the subsurface. Recently, interferometry on the coda of ambient noise‐cross‐correlation functions yielded encouraging results in detecting these changes at active volcanoes. Here, we analyze seismic data recorded at the Klyuchevskoy Volcanic Group in Kamchatka, Russia, between summer of 2015 and summer of 2016 to study signals related to volcanic activity. However, ubiquitous volcanic tremors introduce distortions in the noise wavefield that cause artifacts in the dv/v $dv/v$ estimates masking the impact of physical mechanisms. To avoid such instabilities, we propose a new technique called time‐segmented passive image interferometry. In this technique, we employ a hierarchical clustering algorithm to find periods in which the wavefield can be considered stationary. For these periods, we perform separate noise interferometry studies. To further increase the temporal resolution of our results, we use an AI‐driven approach to find stations with similar dv/v $dv/v$ responses and apply a spatial stack. The impacts of snow load and precipitation dominate the resulting dv/v $dv/v$ time series, as we demonstrate with the help of a simple model. In February 2016, we observe an abrupt velocity drop due to the M7.2 Zhupanov earthquake. Shortly after, we register a gradual velocity increase of about 0.3% at Bezymianny Volcano coinciding with surface deformation observed using remote sensing techniques. We suggest that the inflation of a shallow reservoir related to the beginning of Bezymianny's 2016/2017 eruptive cycle could have caused this local velocity increase and a decorrelation of the correlation function coda. Article in Journal/Newspaper Kamchatka Freie Universität Berlin: Refubium (FU Berlin) |
institution |
Open Polar |
collection |
Freie Universität Berlin: Refubium (FU Berlin) |
op_collection_id |
ftfuberlin |
language |
English |
topic |
seismology volcano monitoring machine learning ambient noise seismic velocity change time varying earth structure ddc:550 |
spellingShingle |
seismology volcano monitoring machine learning ambient noise seismic velocity change time varying earth structure ddc:550 Makus, Peter Sens‐Schönfelder, Christoph Illien, Luc Walter, Thomas R. Yates, Alexander Tilmann, Frederik Deciphering the Whisper of Volcanoes: Monitoring Velocity Changes at Kamchatka's Klyuchevskoy Group With Fluctuating Noise Fields |
topic_facet |
seismology volcano monitoring machine learning ambient noise seismic velocity change time varying earth structure ddc:550 |
description |
Volcanic inflation and deflation often precede eruptions and can lead to seismic velocity changes (dv/v $dv/v$) in the subsurface. Recently, interferometry on the coda of ambient noise‐cross‐correlation functions yielded encouraging results in detecting these changes at active volcanoes. Here, we analyze seismic data recorded at the Klyuchevskoy Volcanic Group in Kamchatka, Russia, between summer of 2015 and summer of 2016 to study signals related to volcanic activity. However, ubiquitous volcanic tremors introduce distortions in the noise wavefield that cause artifacts in the dv/v $dv/v$ estimates masking the impact of physical mechanisms. To avoid such instabilities, we propose a new technique called time‐segmented passive image interferometry. In this technique, we employ a hierarchical clustering algorithm to find periods in which the wavefield can be considered stationary. For these periods, we perform separate noise interferometry studies. To further increase the temporal resolution of our results, we use an AI‐driven approach to find stations with similar dv/v $dv/v$ responses and apply a spatial stack. The impacts of snow load and precipitation dominate the resulting dv/v $dv/v$ time series, as we demonstrate with the help of a simple model. In February 2016, we observe an abrupt velocity drop due to the M7.2 Zhupanov earthquake. Shortly after, we register a gradual velocity increase of about 0.3% at Bezymianny Volcano coinciding with surface deformation observed using remote sensing techniques. We suggest that the inflation of a shallow reservoir related to the beginning of Bezymianny's 2016/2017 eruptive cycle could have caused this local velocity increase and a decorrelation of the correlation function coda. |
format |
Article in Journal/Newspaper |
author |
Makus, Peter Sens‐Schönfelder, Christoph Illien, Luc Walter, Thomas R. Yates, Alexander Tilmann, Frederik |
author_facet |
Makus, Peter Sens‐Schönfelder, Christoph Illien, Luc Walter, Thomas R. Yates, Alexander Tilmann, Frederik |
author_sort |
Makus, Peter |
title |
Deciphering the Whisper of Volcanoes: Monitoring Velocity Changes at Kamchatka's Klyuchevskoy Group With Fluctuating Noise Fields |
title_short |
Deciphering the Whisper of Volcanoes: Monitoring Velocity Changes at Kamchatka's Klyuchevskoy Group With Fluctuating Noise Fields |
title_full |
Deciphering the Whisper of Volcanoes: Monitoring Velocity Changes at Kamchatka's Klyuchevskoy Group With Fluctuating Noise Fields |
title_fullStr |
Deciphering the Whisper of Volcanoes: Monitoring Velocity Changes at Kamchatka's Klyuchevskoy Group With Fluctuating Noise Fields |
title_full_unstemmed |
Deciphering the Whisper of Volcanoes: Monitoring Velocity Changes at Kamchatka's Klyuchevskoy Group With Fluctuating Noise Fields |
title_sort |
deciphering the whisper of volcanoes: monitoring velocity changes at kamchatka's klyuchevskoy group with fluctuating noise fields |
publishDate |
2023 |
url |
https://refubium.fu-berlin.de/handle/fub188/39028 https://doi.org/10.17169/refubium-38744 https://doi.org/10.1029/2022JB025738 |
genre |
Kamchatka |
genre_facet |
Kamchatka |
op_relation |
https://refubium.fu-berlin.de/handle/fub188/39028 http://dx.doi.org/10.17169/refubium-38744 doi:10.1029/2022JB025738 |
op_rights |
This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes. https://creativecommons.org/licenses/by-nc/4.0/ |
op_doi |
https://doi.org/10.17169/refubium-3874410.1029/2022JB025738 |
_version_ |
1768390778565951488 |