Local Seismicity and Sediment Deformation in the West Svalbard Margin: Implications of Neotectonics for Seafloor Seepage
In the Fram Strait, mid-ocean ridge spreading is represented by the ultra-slow system of the Molloy Ridge, the Molloy Transform Fault and the Knipovich Ridge. Sediments on oceanic and continental crust are gas charged and there are several locations with documented seafloor seepage. Sedimentary faul...
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Online Access: | https://hdl.handle.net/10037/32241 https://doi.org/10.1029/2023GC011174 |
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ftunivtroemsoe:oai:munin.uit.no:10037/32241 2024-01-21T10:06:16+01:00 Local Seismicity and Sediment Deformation in the West Svalbard Margin: Implications of Neotectonics for Seafloor Seepage Domel, Przemyslaw Plaza Faverola, Andreia Aletia Schlindwein, Vera Bünz, Stefan 2023-12-12 https://hdl.handle.net/10037/32241 https://doi.org/10.1029/2023GC011174 eng eng Wiley Geochemistry Geophysics Geosystems Domel P, Plaza Faverola A, Schlindwein V, Bünz S. Local Seismicity and Sediment Deformation in the West Svalbard Margin: Implications of Neotectonics for Seafloor Seepage. Geochemistry Geophysics Geosystems. 2023;24(12) FRIDAID 2214075 doi:10.1029/2023GC011174 1525-2027 https://hdl.handle.net/10037/32241 Attribution 4.0 International (CC BY 4.0) openAccess Copyright 2023 The Author(s) https://creativecommons.org/licenses/by/4.0 Journal article Tidsskriftartikkel Peer reviewed publishedVersion 2023 ftunivtroemsoe https://doi.org/10.1029/2023GC011174 2023-12-28T00:08:03Z In the Fram Strait, mid-ocean ridge spreading is represented by the ultra-slow system of the Molloy Ridge, the Molloy Transform Fault and the Knipovich Ridge. Sediments on oceanic and continental crust are gas charged and there are several locations with documented seafloor seepage. Sedimentary faulting shows recent stress release in the sub-surface, but the drivers of stress change and its influence on fluid flow are not entirely understood. We present here the results of an 11-month-long ocean bottom seismometer survey conducted over the highly faulted sediment drift northwards from the Knipovich Ridge to monitor seismicity and infer the regional state of stress. We obtain a detailed earthquake catalog that improves the spatial resolution of mid-ocean ridge seismicity compared with published data. Seismicity at the Molloy Transform Fault is occurring southwards from the bathymetric imprint of the fault, as supported by a seismic profile. Earthquakes in the northern termination of the Knipovich Ridge extend eastwards from the ridge valley, which together with syn-rift faulting identified in seismic reflection data, suggests that a portion of the currently active spreading center is buried under sediments away from the bathymetric expression of the rift valley. This hints at the direct link between crustal rifting processes and faulting in shallow sediments. Two earthquakes occur close to the seepage system of the Vestnesa Ridge further north from the network. We suggest that deeper rift structures, reactivated by gravity and/or post-glacial subsidence, may lead to accommodation of stress through shallow extensional faults, therefore impacting seepage dynamics. Article in Journal/Newspaper Fram Strait Svalbard Svalbard margin University of Tromsø: Munin Open Research Archive Knipovich Ridge ENVELOPE(7.074,7.074,75.712,75.712) Molloy ENVELOPE(70.065,70.065,-49.360,-49.360) Molloy Ridge ENVELOPE(2.750,2.750,79.500,79.500) Svalbard Geochemistry, Geophysics, Geosystems 24 12 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
description |
In the Fram Strait, mid-ocean ridge spreading is represented by the ultra-slow system of the Molloy Ridge, the Molloy Transform Fault and the Knipovich Ridge. Sediments on oceanic and continental crust are gas charged and there are several locations with documented seafloor seepage. Sedimentary faulting shows recent stress release in the sub-surface, but the drivers of stress change and its influence on fluid flow are not entirely understood. We present here the results of an 11-month-long ocean bottom seismometer survey conducted over the highly faulted sediment drift northwards from the Knipovich Ridge to monitor seismicity and infer the regional state of stress. We obtain a detailed earthquake catalog that improves the spatial resolution of mid-ocean ridge seismicity compared with published data. Seismicity at the Molloy Transform Fault is occurring southwards from the bathymetric imprint of the fault, as supported by a seismic profile. Earthquakes in the northern termination of the Knipovich Ridge extend eastwards from the ridge valley, which together with syn-rift faulting identified in seismic reflection data, suggests that a portion of the currently active spreading center is buried under sediments away from the bathymetric expression of the rift valley. This hints at the direct link between crustal rifting processes and faulting in shallow sediments. Two earthquakes occur close to the seepage system of the Vestnesa Ridge further north from the network. We suggest that deeper rift structures, reactivated by gravity and/or post-glacial subsidence, may lead to accommodation of stress through shallow extensional faults, therefore impacting seepage dynamics. |
format |
Article in Journal/Newspaper |
author |
Domel, Przemyslaw Plaza Faverola, Andreia Aletia Schlindwein, Vera Bünz, Stefan |
spellingShingle |
Domel, Przemyslaw Plaza Faverola, Andreia Aletia Schlindwein, Vera Bünz, Stefan Local Seismicity and Sediment Deformation in the West Svalbard Margin: Implications of Neotectonics for Seafloor Seepage |
author_facet |
Domel, Przemyslaw Plaza Faverola, Andreia Aletia Schlindwein, Vera Bünz, Stefan |
author_sort |
Domel, Przemyslaw |
title |
Local Seismicity and Sediment Deformation in the West Svalbard Margin: Implications of Neotectonics for Seafloor Seepage |
title_short |
Local Seismicity and Sediment Deformation in the West Svalbard Margin: Implications of Neotectonics for Seafloor Seepage |
title_full |
Local Seismicity and Sediment Deformation in the West Svalbard Margin: Implications of Neotectonics for Seafloor Seepage |
title_fullStr |
Local Seismicity and Sediment Deformation in the West Svalbard Margin: Implications of Neotectonics for Seafloor Seepage |
title_full_unstemmed |
Local Seismicity and Sediment Deformation in the West Svalbard Margin: Implications of Neotectonics for Seafloor Seepage |
title_sort |
local seismicity and sediment deformation in the west svalbard margin: implications of neotectonics for seafloor seepage |
publisher |
Wiley |
publishDate |
2023 |
url |
https://hdl.handle.net/10037/32241 https://doi.org/10.1029/2023GC011174 |
long_lat |
ENVELOPE(7.074,7.074,75.712,75.712) ENVELOPE(70.065,70.065,-49.360,-49.360) ENVELOPE(2.750,2.750,79.500,79.500) |
geographic |
Knipovich Ridge Molloy Molloy Ridge Svalbard |
geographic_facet |
Knipovich Ridge Molloy Molloy Ridge Svalbard |
genre |
Fram Strait Svalbard Svalbard margin |
genre_facet |
Fram Strait Svalbard Svalbard margin |
op_relation |
Geochemistry Geophysics Geosystems Domel P, Plaza Faverola A, Schlindwein V, Bünz S. Local Seismicity and Sediment Deformation in the West Svalbard Margin: Implications of Neotectonics for Seafloor Seepage. Geochemistry Geophysics Geosystems. 2023;24(12) FRIDAID 2214075 doi:10.1029/2023GC011174 1525-2027 https://hdl.handle.net/10037/32241 |
op_rights |
Attribution 4.0 International (CC BY 4.0) openAccess Copyright 2023 The Author(s) https://creativecommons.org/licenses/by/4.0 |
op_doi |
https://doi.org/10.1029/2023GC011174 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
24 |
container_issue |
12 |
_version_ |
1788696722584633344 |