Frontal ridge slope failure at the northern Cascadia margin: Margin-normal fault and gas hydrate control
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Résumé
Research Article| November 01, 2010 Frontal ridge slope failure at the northern Cascadia margin: Margin-normal fault and gas hydrate control Caroll López; Caroll López 1School of Earth and Ocean Sciences, University of Victoria, Victoria, BC V8W 3V6, Canada Search for other works by this author on: GSW Google Scholar George Spence; George Spence 1School of Earth and Ocean Sciences, University of Victoria, Victoria, BC V8W 3V6, Canada Search for other works by this author on: GSW Google Scholar Roy Hyndman; Roy Hyndman 1School of Earth and Ocean Sciences, University of Victoria, Victoria, BC V8W 3V6, Canada2Geological Survey of Canada–Pacific, 9860 W. Saanich Road, Sidney, BC V8L 4B2, Canada Search for other works by this author on: GSW Google Scholar Deborah Kelley Deborah Kelley 3School of Oceanography, University of Washington, Seattle, Washington 98195, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Caroll López 1School of Earth and Ocean Sciences, University of Victoria, Victoria, BC V8W 3V6, Canada George Spence 1School of Earth and Ocean Sciences, University of Victoria, Victoria, BC V8W 3V6, Canada Roy Hyndman 1School of Earth and Ocean Sciences, University of Victoria, Victoria, BC V8W 3V6, Canada2Geological Survey of Canada–Pacific, 9860 W. Saanich Road, Sidney, BC V8L 4B2, Canada Deborah Kelley 3School of Oceanography, University of Washington, Seattle, Washington 98195, USA Publisher: Geological Society of America Received: 19 Feb 2010 Revision Received: 08 Jun 2010 Accepted: 11 Jun 2010 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2010 Geological Society of America Geology (2010) 38 (11): 967–970. https://doi.org/10.1130/G31136.1 Article history Received: 19 Feb 2010 Revision Received: 08 Jun 2010 Accepted: 11 Jun 2010 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Caroll López, George Spence, Roy Hyndman, Deborah Kelley; Frontal ridge slope failure at the northern Cascadia margin: Margin-normal fault and gas hydrate control. Geology 2010;; 38 (11): 967–970. doi: https://doi.org/10.1130/G31136.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract On the northern Cascadia accretionary margin off Vancouver Island, Canada, there are numerous sedimentary slide features near the base of the slope, and significant amounts of gas hydrate found beneath the ridge suggest a possible connection. A 2-km-wide collapse structure with a 300-m-high headwall has been studied by multibeam bathymetry and a single-channel seismic reflection grid. Migrated seismic reflection lines on the frontal ridge image multiple 15–75-m-high seafloor scarps perpendicular to the margin that are the seafloor expressions of normal faults that cut deeply into the sediment section. Two of the largest faults are aligned with the sidewalls of the slide, indicating that the lateral extent of the collapse is fault controlled. The presence of marine gas hydrate beneath the ridge is based on a widespread hydrate bottom-simulating reflector (BSR), high velocities determined by ocean bottom seismograph data, and sediment core samples and downhole logs collected by the Integrated Ocean Drilling Program at Site U1326. The depth of the BSR at 255 (±15) m coincides closely with the estimated depth of the glide plane beneath the slide. This suggests that the base of the slope failure is related to the contrast between strong hydrate-cemented sediments above the BSR and underlying weak sediments containing free gas. Strong earthquake shaking on this convergent margin likely provides the trigger for the slide. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,001 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,001 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,013 | 0,003 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
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