Multibeam bathymetry and backscatter data analysis of pockmarks at Vestnesa Ridge off NW-Svalbard
The Vestnesa Ridge is an elongated sediment drift situated at 79o N on the northwest Svalbard margin in the Fram Strait. It is one of the northernmost documented oceanic gas hydrate provinces. The narrow southeastern part of the ridge is characterized by pockmarks that line up along the apex of the...
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UiT Norges arktiske universitet
2014
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ftunivtroemsoe:oai:munin.uit.no:10037/6913 2023-05-15T16:18:07+02:00 Multibeam bathymetry and backscatter data analysis of pockmarks at Vestnesa Ridge off NW-Svalbard Villaflor, Glennda Alina 2014-11-09 https://hdl.handle.net/10037/6913 eng eng UiT Norges arktiske universitet UiT The Arctic University of Norway https://hdl.handle.net/10037/6913 URN:NBN:no-uit_munin_6518 openAccess Copyright 2014 The Author(s) VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466 GEO-3900 Master thesis Mastergradsoppgave 2014 ftunivtroemsoe 2021-06-25T17:54:04Z The Vestnesa Ridge is an elongated sediment drift situated at 79o N on the northwest Svalbard margin in the Fram Strait. It is one of the northernmost documented oceanic gas hydrate provinces. The narrow southeastern part of the ridge is characterized by pockmarks that line up along the apex of the crest. Some of these pockmarks are continuously venting gas while some are inactive. This study looks at changes in morphology of the pockmarks in relation to sedimentary processes, ocean currents and fluid flow mechanism, and their role in active fluid venting. Detailed bathymetry and backscatter data from different surveys in 2010, 2012 and 2013 are studied. Comparing the surfaces reveals relatively less sediment deposition in the pockmarks. The pockmarks exhibit an elongate shape and asymmetrical profiles, pointing to a strong influence by the WSC bottom currents. Backscatter data also reveal possible carbonate or gas hydrate deposits inside the pockmarks. These observations, along with apparent inactivity in some pockmarks, point to a possible scenario where carbonate or hydrate formation leads to self-sealing and eventual relocation of the gas vents through existing faults and fractures. Master Thesis Fram Strait Svalbard Svalbard margin University of Tromsø: Munin Open Research Archive Svalbard |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466 GEO-3900 |
spellingShingle |
VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466 GEO-3900 Villaflor, Glennda Alina Multibeam bathymetry and backscatter data analysis of pockmarks at Vestnesa Ridge off NW-Svalbard |
topic_facet |
VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466 GEO-3900 |
description |
The Vestnesa Ridge is an elongated sediment drift situated at 79o N on the northwest Svalbard margin in the Fram Strait. It is one of the northernmost documented oceanic gas hydrate provinces. The narrow southeastern part of the ridge is characterized by pockmarks that line up along the apex of the crest. Some of these pockmarks are continuously venting gas while some are inactive. This study looks at changes in morphology of the pockmarks in relation to sedimentary processes, ocean currents and fluid flow mechanism, and their role in active fluid venting. Detailed bathymetry and backscatter data from different surveys in 2010, 2012 and 2013 are studied. Comparing the surfaces reveals relatively less sediment deposition in the pockmarks. The pockmarks exhibit an elongate shape and asymmetrical profiles, pointing to a strong influence by the WSC bottom currents. Backscatter data also reveal possible carbonate or gas hydrate deposits inside the pockmarks. These observations, along with apparent inactivity in some pockmarks, point to a possible scenario where carbonate or hydrate formation leads to self-sealing and eventual relocation of the gas vents through existing faults and fractures. |
format |
Master Thesis |
author |
Villaflor, Glennda Alina |
author_facet |
Villaflor, Glennda Alina |
author_sort |
Villaflor, Glennda Alina |
title |
Multibeam bathymetry and backscatter data analysis of pockmarks at Vestnesa Ridge off NW-Svalbard |
title_short |
Multibeam bathymetry and backscatter data analysis of pockmarks at Vestnesa Ridge off NW-Svalbard |
title_full |
Multibeam bathymetry and backscatter data analysis of pockmarks at Vestnesa Ridge off NW-Svalbard |
title_fullStr |
Multibeam bathymetry and backscatter data analysis of pockmarks at Vestnesa Ridge off NW-Svalbard |
title_full_unstemmed |
Multibeam bathymetry and backscatter data analysis of pockmarks at Vestnesa Ridge off NW-Svalbard |
title_sort |
multibeam bathymetry and backscatter data analysis of pockmarks at vestnesa ridge off nw-svalbard |
publisher |
UiT Norges arktiske universitet |
publishDate |
2014 |
url |
https://hdl.handle.net/10037/6913 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
Fram Strait Svalbard Svalbard margin |
genre_facet |
Fram Strait Svalbard Svalbard margin |
op_relation |
https://hdl.handle.net/10037/6913 URN:NBN:no-uit_munin_6518 |
op_rights |
openAccess Copyright 2014 The Author(s) |
_version_ |
1766004241472684032 |