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USGS – GeoPRISMS Synergistic Opportunities: Offshore Atlantic Margin

USGS – GeoPRISMS Synergistic Opportunities: Offshore Atlantic Margin. Active USGS Programs:. Marine Geohazard Assessment along the US East Coast (NRC). Extended Continental Shelf (ECS). Debbie Hutchinson Jason Chaytor Matt Arsenault Greg Mountain Ginger Barth Jon Childs. Uri ten Brink

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USGS – GeoPRISMS Synergistic Opportunities: Offshore Atlantic Margin

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  1. USGS – GeoPRISMS Synergistic Opportunities: Offshore Atlantic Margin Active USGS Programs: Marine Geohazard Assessment along the US East Coast (NRC) Extended Continental Shelf (ECS) Debbie Hutchinson Jason Chaytor Matt Arsenault Greg Mountain Ginger Barth Jon Childs Uri ten Brink Jason Chaytor Dave Twichell Danny Brothers Homa Lee Eric Geist

  2. Extended Continental Shelf (ECS) Atlantic Program Task: Acquire multibeam bathymetry (led by NOAA and UNH) and multichannel seismic reflection and refraction data (led by USGS) (in concordance with Article 76 of the United Nations Convention on the Law of the Sea) Seismic data will be used to map sediment thickness and study extent of down‐slope sedimentary movement in order to define the outer limits of the U.S. ECS beyond 200 nmi (up to outer limit of 350 nm) Primary target region: Cape Cod to Cape Lookout Particular focus on fracture zones Regions to north and south are lower priority (See handouts from Debbie Hutchinson and Ginger Barth)

  3. Extended Continental Shelf (ECS) Atlantic Program Tentative Schedule: Survey in 2013 in line with the R/V Langseth plans to be in Atlantic Data Release: MCS: All raw data available w/in 6-months of cruise Preliminary processed MCS within 1-year Final stacked, time-migrated MCS within 2-years OBS: Released within 2-years Potential Field (gravity and magnetics): Released through NGDC as soon as practical

  4. Marine Geohazard Assessment Ongoing funding from US Nuclear Regulatory Commission and USGS Examine submarine landslide potential and associated tsunami hazards to the US Eastern seaboard • Data Collection: • Bathymetry: • Multibean bathymetry of the continental slope and rise (merged with ECS data) • MCS: • High-resolution MCS surveys of major slide regions to look at preconditioning factors • Southern New England Slide Complex (2,000 km collected in 2010 and 2011) • Carrituck slide (2012 tentative plans) • Sediment Cores: • Date the slides and constrain geotechnical properties of seafloor sediment • Southern New England • Carrituck (2012 tentative plans) See 2009 Volume in Marine Geology

  5. Marine Geohazard Assessment Primary Message: USGS will continue to work here regardless of ECS funding with the focus being marine geohazard assessment Overlapping scientific objectives and targets may allow us to leverage resources and expertise USGS and NSF should coordinate projects aimed at hazard assessment

  6. Brief Update on Existing Seismic Data BOEM Seismic Archives: Industry Reprocessing: Fugro reprocessed all USGS legacy data through depth-converted, time migration. Framework studies may be a low priority w/ existing coverage, but we need to look into acquiring reprocessed data

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