Marine Geoscience Data System
NCShelf_Walsh Seismic:Active:Subbottom
Raw sub-bottom CHIRP data (SEG-Y format) of the North Carolina shelf post-Hurricane Florence (2019 survey)
Hurricane Florence made landfall as a Category 1 near Wilmington, NC on the morning of September 14, 2018. Hurricane-force winds were experienced over a large region, yielding powerful storm surge and waves over 8 m offshore. The overarching objective of the project was to collect seafloor mapping data and sediment samples over a previously surveyed portion of the Morehead City Ocean Dredged Material Disposal Site (ODMDS) to assess shelf sediment reworking associated with Hurricane Florence. The project collected geophysical data and sediment samples over a portion of the ODMDS offshore of Bogue Banks, NC in early 2019. Geodynamics LLC was contracted and collected a suite of multibeam bathymetry, backscatter and seismic reflection data along with sediment samples. These data sets add to previously collected information over the same area in 2013 and 2018. Sub-bottom profile "CHIRP" data was collected on February 26, 2019 using an Edgetech 512i system operating at a frequency range of 0.5 – 7.2 kHz at 30 ms. The data files are in SEG-Y format and contain raw sub-bottom data with navigation. Funding was provided by an NSF RAPID grant titled "RAPID: Examining Seafloor Dynamics offshore Bogue Banks, North Carolina, Related to Hurricane Florence", Award OCE 1906073 to lead investigator J.P. Walsh.
Device Info
EdgeTech:3200-XS, SB-512i
Benthos (Boat)
Geodynamics LLC
Data have not been processed or modified since acquisition (e.g. Realtime navigation or sonar data, raw images etc.).

Data Files


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