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Geosciences 2019, 9(1), 10;

Seismic Imaging of Seafloor Deformation Induced by Impact from Large Submarine Landslide Blocks, Offshore Oregon

School of Earth Sciences, The Ohio State University, Columbus, OH 43210, USA
ASEE Postdoctoral Research Fellow, US Naval Research Laboratory, Stennis Space Center, Washington, DC 20375, USA
College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, USA
Department of Coastal and Marine Systems Science, Coastal Carolina University, Conway, SC 29528, USA
Author to whom correspondence should be addressed.
Received: 13 November 2018 / Revised: 17 December 2018 / Accepted: 19 December 2018 / Published: 25 December 2018
(This article belongs to the Special Issue Submarine Landslides – Assessing the Stability of Submerged Slopes)
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A series of large blocks from the 44-North Slide, offshore Oregon, impacted the seafloor with sufficient force to induce a broad zone of deformation. In 2017, we acquired a seismic profile from the headwall area to the outer toe of this slide. Previous work identified this slide, but it has not been imaged at high resolution before this survey. A striking surficial feature is a collection of blocks that lie downslope from an amphitheater-shaped headwall. The blocks traveled up to 20-km horizontally and about 1200-m vertically down a 13° slope and now cover an area of ~100 km2. The blocks have rough and angular edges that extend up to 400-m above the surrounding seafloor. Seaward of the blocks, a 10-km zone of sediment is deformed, horizontally shortened by 8%. We interpret the strain field to be a result of the dynamic impact forces of the slide. This suggests a high-mobility failure with tsunamigenic potential. It is unclear what preconditioned and triggered this event, however, earthquake-induced failure is one possibility. Gas hydrate dissociation may have also played a role due to the presence of a bottom-simulating reflector beneath the source area. This study underscores the need to understand the dynamic processes of submarine landslides to more accurately estimate their societal impacts. View Full-Text
Keywords: submarine landslide; deformation; Cascadia; Oregon; 44-North submarine landslide; deformation; Cascadia; Oregon; 44-North

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Lenz, B.L.; Sawyer, D.E.; Phrampus, B.; Davenport, K.; Long, A. Seismic Imaging of Seafloor Deformation Induced by Impact from Large Submarine Landslide Blocks, Offshore Oregon. Geosciences 2019, 9, 10.

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