Origin and Periodic Behavior of Short Duration Signals Recorded by Seismometers at Vestnesa Ridge, an Active Seepage Site on the West-Svalbard Continental Margin
Short duration events (SDEs) are reported worldwide from ocean-bottom seismometers (OBSs). Due to their high frequency (4–30 Hz) and short duration, they are commonly attributed to aseismic sources, such as fluid migration related processes from cold seeps, biological signals, or noise. We present t...
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ftdoajarticles:oai:doaj.org/article:5d27289fe4c64d419f81af0e0db9c1f1 2023-05-15T18:29:41+02:00 Origin and Periodic Behavior of Short Duration Signals Recorded by Seismometers at Vestnesa Ridge, an Active Seepage Site on the West-Svalbard Continental Margin P. Domel S. Singhroha A. Plaza-Faverola V. Schlindwein H. Ramachandran S. Bünz 2022-03-01T00:00:00Z https://doi.org/10.3389/feart.2022.831526 https://doaj.org/article/5d27289fe4c64d419f81af0e0db9c1f1 EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/feart.2022.831526/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2022.831526 https://doaj.org/article/5d27289fe4c64d419f81af0e0db9c1f1 Frontiers in Earth Science, Vol 10 (2022) ocean-bottom seismometer micro-seismicity short duration events methane seepage gas hydrates tidal cycle Science Q article 2022 ftdoajarticles https://doi.org/10.3389/feart.2022.831526 2022-12-31T15:34:49Z Short duration events (SDEs) are reported worldwide from ocean-bottom seismometers (OBSs). Due to their high frequency (4–30 Hz) and short duration, they are commonly attributed to aseismic sources, such as fluid migration related processes from cold seeps, biological signals, or noise. We present the results of a passive seismic experiment that deployed an OBS network for 10-month (October 2015–July 2016) at an active seepage site on Vestnesa Ridge, West Svalbard continental margin. We characterize SDEs and their temporal occurrence using the conventional short-time-average over long-time-average approach. Signal periodograms show that SDEs have periodic patterns related to solar and lunar cycles. A monthly correlation between SDE occurrences and modelled tides for the area indicates that tides have a partial control on SDEs recorded over 10 months. The numbers of SDEs increase close to the tidal minima and maxima, although a correlation with tidal highs appears more robust. Large bursts of SDEs are separated by interim quiet cycles. In contrast, the periodicity analysis of tremors shows a different pattern, likely caused by the effect of tidally controlled underwater currents on the instrumentation. We suggest that SDEs at Vestnesa Ridge may be related to the dynamics of the methane seepage system which is characterized by a complex interaction between migration of deep sourced fluids, gas hydrate formation and seafloor gas advection through cracks. Our observation from this investigated area offshore west-Svalbard, is in line with the documentation of SDEs from other continental margins, where micro-seismicity and gas release into the water column are seemingly connected. Article in Journal/Newspaper Svalbard Directory of Open Access Journals: DOAJ Articles Svalbard Frontiers in Earth Science 10 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
ocean-bottom seismometer micro-seismicity short duration events methane seepage gas hydrates tidal cycle Science Q |
spellingShingle |
ocean-bottom seismometer micro-seismicity short duration events methane seepage gas hydrates tidal cycle Science Q P. Domel S. Singhroha A. Plaza-Faverola V. Schlindwein H. Ramachandran S. Bünz Origin and Periodic Behavior of Short Duration Signals Recorded by Seismometers at Vestnesa Ridge, an Active Seepage Site on the West-Svalbard Continental Margin |
topic_facet |
ocean-bottom seismometer micro-seismicity short duration events methane seepage gas hydrates tidal cycle Science Q |
description |
Short duration events (SDEs) are reported worldwide from ocean-bottom seismometers (OBSs). Due to their high frequency (4–30 Hz) and short duration, they are commonly attributed to aseismic sources, such as fluid migration related processes from cold seeps, biological signals, or noise. We present the results of a passive seismic experiment that deployed an OBS network for 10-month (October 2015–July 2016) at an active seepage site on Vestnesa Ridge, West Svalbard continental margin. We characterize SDEs and their temporal occurrence using the conventional short-time-average over long-time-average approach. Signal periodograms show that SDEs have periodic patterns related to solar and lunar cycles. A monthly correlation between SDE occurrences and modelled tides for the area indicates that tides have a partial control on SDEs recorded over 10 months. The numbers of SDEs increase close to the tidal minima and maxima, although a correlation with tidal highs appears more robust. Large bursts of SDEs are separated by interim quiet cycles. In contrast, the periodicity analysis of tremors shows a different pattern, likely caused by the effect of tidally controlled underwater currents on the instrumentation. We suggest that SDEs at Vestnesa Ridge may be related to the dynamics of the methane seepage system which is characterized by a complex interaction between migration of deep sourced fluids, gas hydrate formation and seafloor gas advection through cracks. Our observation from this investigated area offshore west-Svalbard, is in line with the documentation of SDEs from other continental margins, where micro-seismicity and gas release into the water column are seemingly connected. |
format |
Article in Journal/Newspaper |
author |
P. Domel S. Singhroha A. Plaza-Faverola V. Schlindwein H. Ramachandran S. Bünz |
author_facet |
P. Domel S. Singhroha A. Plaza-Faverola V. Schlindwein H. Ramachandran S. Bünz |
author_sort |
P. Domel |
title |
Origin and Periodic Behavior of Short Duration Signals Recorded by Seismometers at Vestnesa Ridge, an Active Seepage Site on the West-Svalbard Continental Margin |
title_short |
Origin and Periodic Behavior of Short Duration Signals Recorded by Seismometers at Vestnesa Ridge, an Active Seepage Site on the West-Svalbard Continental Margin |
title_full |
Origin and Periodic Behavior of Short Duration Signals Recorded by Seismometers at Vestnesa Ridge, an Active Seepage Site on the West-Svalbard Continental Margin |
title_fullStr |
Origin and Periodic Behavior of Short Duration Signals Recorded by Seismometers at Vestnesa Ridge, an Active Seepage Site on the West-Svalbard Continental Margin |
title_full_unstemmed |
Origin and Periodic Behavior of Short Duration Signals Recorded by Seismometers at Vestnesa Ridge, an Active Seepage Site on the West-Svalbard Continental Margin |
title_sort |
origin and periodic behavior of short duration signals recorded by seismometers at vestnesa ridge, an active seepage site on the west-svalbard continental margin |
publisher |
Frontiers Media S.A. |
publishDate |
2022 |
url |
https://doi.org/10.3389/feart.2022.831526 https://doaj.org/article/5d27289fe4c64d419f81af0e0db9c1f1 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
Svalbard |
genre_facet |
Svalbard |
op_source |
Frontiers in Earth Science, Vol 10 (2022) |
op_relation |
https://www.frontiersin.org/articles/10.3389/feart.2022.831526/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2022.831526 https://doaj.org/article/5d27289fe4c64d419f81af0e0db9c1f1 |
op_doi |
https://doi.org/10.3389/feart.2022.831526 |
container_title |
Frontiers in Earth Science |
container_volume |
10 |
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1766212974579548160 |