Microseismicity linked to gas migration and leakage on the western Svalbard shelf
Source at: http://doi.org/10.1002/2017GC007107 The continental margin off Prins Karls Forland, western Svalbard, is characterized by widespread natural gas seepage into the water column at and upslope of the gas hydrate stability zone. We deployed an ocean bottom seismometer integrated into the MASO...
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American Geophysical Union (AGU)
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Online Access: | https://hdl.handle.net/10037/13175 https://doi.org/10.1002/2017GC007107 |
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ftunivtroemsoe:oai:munin.uit.no:10037/13175 2023-05-15T14:27:10+02:00 Microseismicity linked to gas migration and leakage on the western Svalbard shelf Franek, Peter Plaza-Faverola, Andreia Mienert, Jurgen Bünz, Stefan Ferré, Benedicte Hubbard, Alun Lloyd 2017-12-26 https://hdl.handle.net/10037/13175 https://doi.org/10.1002/2017GC007107 eng eng American Geophysical Union (AGU) Geochemistry Geophysics Geosystems info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/ Franek, P., Plaza-Faverola, A., Mienert, J., Bünz, S., Ferré, B. & Hubbard, A. L. (2017). Microseismicity linked to gas migration and leakage on the western Svalbard shelf. Geochemistry Geophysics Geosystems, 18(12), 4623-4645. http://doi.org/10.1002/2017GC007107 FRIDAID 1526016 doi:10.1002/2017GC007107 1525-2027 https://hdl.handle.net/10037/13175 openAccess VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Petroleumsgeologi og -geofysikk: 464 VDP::Mathematics and natural science: 400::Geosciences: 450::Petroleum geology and petroleum geophysics: 464 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 Journal article Tidsskriftartikkel Peer reviewed 2017 ftunivtroemsoe https://doi.org/10.1002/2017GC007107 2021-06-25T17:55:43Z Source at: http://doi.org/10.1002/2017GC007107 The continental margin off Prins Karls Forland, western Svalbard, is characterized by widespread natural gas seepage into the water column at and upslope of the gas hydrate stability zone. We deployed an ocean bottom seismometer integrated into the MASOX (Monitoring Arctic Seafloor-Ocean Exchange) automated seabed observatory at the pinch-out of this zone at 389 m water depth to investigate passive seismicity over a continuous 297 day period from 13 October 2010. An automated triggering algorithm was applied to detect over 220,000 short duration events (SDEs) defined as having a duration of less than 1 s. The analysis reveals two different types of SDEs, each with a distinctive characteristic seismic signature. We infer that the first type consists of vocal signals generated by moving mammals, likely finback whales. The second type corresponds to signals with a source within a few hundred meters of the seismometer, either due east or west, that vary on short (tens of days) and seasonal time scales. Based on evidence of prevalent seafloor seepage and subseafloor gas accumulations, we hypothesize that the second type of SDEs is related to subseafloor fluid migration and gas seepage. Furthermore, we postulate that the observed temporal variations in microseismicity are driven by transient fluid release and due to the dynamics of thermally forced, seasonal gas hydrate decomposition. Our analysis presents a novel technique for monitoring the duration, intensity, and periodicity of fluid migration and seepage at the seabed and can help elucidate the environmental controls on gas hydrate decomposition and release. Article in Journal/Newspaper Arctic Arctic Prins Karls Forland Svalbard University of Tromsø: Munin Open Research Archive Arctic Prins Karls Forland ENVELOPE(11.175,11.175,78.543,78.543) Svalbard Geochemistry, Geophysics, Geosystems 18 12 4623 4645 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Petroleumsgeologi og -geofysikk: 464 VDP::Mathematics and natural science: 400::Geosciences: 450::Petroleum geology and petroleum geophysics: 464 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 |
spellingShingle |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Petroleumsgeologi og -geofysikk: 464 VDP::Mathematics and natural science: 400::Geosciences: 450::Petroleum geology and petroleum geophysics: 464 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 Franek, Peter Plaza-Faverola, Andreia Mienert, Jurgen Bünz, Stefan Ferré, Benedicte Hubbard, Alun Lloyd Microseismicity linked to gas migration and leakage on the western Svalbard shelf |
topic_facet |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Petroleumsgeologi og -geofysikk: 464 VDP::Mathematics and natural science: 400::Geosciences: 450::Petroleum geology and petroleum geophysics: 464 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 |
description |
Source at: http://doi.org/10.1002/2017GC007107 The continental margin off Prins Karls Forland, western Svalbard, is characterized by widespread natural gas seepage into the water column at and upslope of the gas hydrate stability zone. We deployed an ocean bottom seismometer integrated into the MASOX (Monitoring Arctic Seafloor-Ocean Exchange) automated seabed observatory at the pinch-out of this zone at 389 m water depth to investigate passive seismicity over a continuous 297 day period from 13 October 2010. An automated triggering algorithm was applied to detect over 220,000 short duration events (SDEs) defined as having a duration of less than 1 s. The analysis reveals two different types of SDEs, each with a distinctive characteristic seismic signature. We infer that the first type consists of vocal signals generated by moving mammals, likely finback whales. The second type corresponds to signals with a source within a few hundred meters of the seismometer, either due east or west, that vary on short (tens of days) and seasonal time scales. Based on evidence of prevalent seafloor seepage and subseafloor gas accumulations, we hypothesize that the second type of SDEs is related to subseafloor fluid migration and gas seepage. Furthermore, we postulate that the observed temporal variations in microseismicity are driven by transient fluid release and due to the dynamics of thermally forced, seasonal gas hydrate decomposition. Our analysis presents a novel technique for monitoring the duration, intensity, and periodicity of fluid migration and seepage at the seabed and can help elucidate the environmental controls on gas hydrate decomposition and release. |
format |
Article in Journal/Newspaper |
author |
Franek, Peter Plaza-Faverola, Andreia Mienert, Jurgen Bünz, Stefan Ferré, Benedicte Hubbard, Alun Lloyd |
author_facet |
Franek, Peter Plaza-Faverola, Andreia Mienert, Jurgen Bünz, Stefan Ferré, Benedicte Hubbard, Alun Lloyd |
author_sort |
Franek, Peter |
title |
Microseismicity linked to gas migration and leakage on the western Svalbard shelf |
title_short |
Microseismicity linked to gas migration and leakage on the western Svalbard shelf |
title_full |
Microseismicity linked to gas migration and leakage on the western Svalbard shelf |
title_fullStr |
Microseismicity linked to gas migration and leakage on the western Svalbard shelf |
title_full_unstemmed |
Microseismicity linked to gas migration and leakage on the western Svalbard shelf |
title_sort |
microseismicity linked to gas migration and leakage on the western svalbard shelf |
publisher |
American Geophysical Union (AGU) |
publishDate |
2017 |
url |
https://hdl.handle.net/10037/13175 https://doi.org/10.1002/2017GC007107 |
long_lat |
ENVELOPE(11.175,11.175,78.543,78.543) |
geographic |
Arctic Prins Karls Forland Svalbard |
geographic_facet |
Arctic Prins Karls Forland Svalbard |
genre |
Arctic Arctic Prins Karls Forland Svalbard |
genre_facet |
Arctic Arctic Prins Karls Forland Svalbard |
op_relation |
Geochemistry Geophysics Geosystems info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/ Franek, P., Plaza-Faverola, A., Mienert, J., Bünz, S., Ferré, B. & Hubbard, A. L. (2017). Microseismicity linked to gas migration and leakage on the western Svalbard shelf. Geochemistry Geophysics Geosystems, 18(12), 4623-4645. http://doi.org/10.1002/2017GC007107 FRIDAID 1526016 doi:10.1002/2017GC007107 1525-2027 https://hdl.handle.net/10037/13175 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1002/2017GC007107 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
18 |
container_issue |
12 |
container_start_page |
4623 |
op_container_end_page |
4645 |
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1766300769023164416 |