Ocean bottom seismometer experiment on the Beaufort shelf and slope region conducted during Expedition ARA04C on the IBRV Araon / [by] M. Riedel ... [et al.]. : M183-2/7621E-PDF

Expedition ARA04C was conducted from September 10 to September 26, 2013 on the Korean icebreaker IBRV Araon in the Canadian Beaufort Sea. The expedition was set out to collect scientific data for a regional geo-hazard assessment of the offshore Beaufort region. A critical element of the hazards is the distribution of permafrost across the shelf and slope region. To address this question a set of Ocean Bottom Seismometers (OBS) were deployed to measure seismic velocities as indicator for ice-content in the sub-surface. This report describes the techncially required pre-processing steps (OBS relocation and orientation analyses) and includes an initial compressional wave velocity analysis. The analysis of the hydrophone and vertical-component data from the OBS stations reveals a compressional wave-velocity structure with values ranging from 1800 m/s to over 4000 m/s indicative of wide-spread ice-bearing sediments.

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