A.A. Boggess B.J. Buczkowski J.D. Chaytor 20230605 1.0 spreadsheet data release DOI:10.5066/P9H74BAX Woods Hole Coastal and Marine Science Center, Woods Hole, MA U.S. Geological Survey, Coastal and Marine Hazards and Resources Program https://doi.org/10.5066/P9H74BAX https://www.sciencebase.gov/catalog/item/6436e5f8d34ee8d4addcb359 A.A. Boggess B.J. Buczkowski J.D. Chaytor 2023 1.0 data release DOI:10.5066/P9H74BAX Reston, VA U.S. Geological Survey Suggested citation: Boggess, A.A., Buczkowski, B.J., and Chaytor, J.D., 2023, Sedimentological and geotechnical analyses of marine sediment cores from the Currituck Landslide Complex and upper slope adjacent to Baltimore Canyon collected on USGS Field Activity 2012-007-FA: U.S. Geological Survey data release, https://doi.org/10.5066/P9H74BAX. https://doi.org/10.5066/P9H74BAX https://www.sciencebase.gov/catalog/item/64355a3dd34ee8d4addacd40 Twenty-four piston cores (and associated trigger cores) were collected from the source zone of the Currituck Landslide Complex and upper slope adjacent to Baltimore Canyon by the U.S. Geological Survey and the University of Rhode Island Department of Ocean Engineering during an eight-day cruise aboard the R/V Hugh R. Sharp in September/October of 2012. These cores were analyzed for evidence of seafloor mass transport processes, with an emphasis on constraining the age and shallow stratigraphy of the landslide complex. Sedimentological and geotechnical characterization of the cores was carried out through whole core imaging and description, followed by analysis of discrete samples at the USGS Woods Hole Coastal and Marine Science Center's Sediment Analysis Laboratory and other facilities, including grain-size, CaCO3 content, mineral composition, and bulk index properties (e.g., undrained shear strength and water content), micropaleontologic separations, and geochronology. This data release contains the results of these core descriptions and results of the laboratory analyses. The data provides a comprehensive understanding of the nature and properties of the sediments found in this geographic location. Undrained shear strength provides a relative measure of the sediments' ‘stiffness’ within the cores. Cores were collected on the Hugh R. Sharp cruise HRS1209 from September 28, 2012 to October 4, 2012, and currently reside in the Woods Hole Coastal and Marine Science Center's core repository. Information about USGS Field Activity 2012-007-FA is available at https://cmgds.marine.usgs.gov/fan_info.php?fan=2012-007-FA. 20120928 20121004 ground condition Complete None planned -74.75686 -73.63370 37.96051 36.14594 ISO 19115 Topic Category oceans geoscientificInformation None U.S. Geological Survey USGS Woods Hole Coastal and Marine Science Center WHCMSC sediment samples cores piston cores trigger cores Cruise ID HRS1209 WHCMSC Field Activity 2012-007-FA Hugh R. Sharp lithology sediment stiffness torque meter shear strength Su USGS Thesaurus geology sedimentology piston coring core analysis unconsolidated deposits clay deposits sand deposits earth material properties Holocene USGS Metadata Identifier USGS:6436e5f8d34ee8d4addcb359 None Currituck Landslide Baltimore Canyon Atlantic U.S. Continental Shelf Virginia North Carolina Maryland None. Not to be used for navigation. The public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset. Jason D. Chaytor U.S. Geological Survey, Northeast Region Research Geologist mailing and physical

384 Woods Hole Road

Woods Hole MA 02543 US 508-548-8700 x2351 jchaytor@usgs.gov https://www.sciencebase.gov/catalog/file/get/6436e5f8d34ee8d4addcb359?name=HRS1209_UndrainedShearStrength.jpg&allowOpen=true Browse image of the collection locations of cores analyzed for undrained shear strength. JPEG Microsoft Windows 10 Enterprise Version 10.0.18363 (Build 18363) Torque measurement depths were checked to make sure that they matched the depths recorded in the data. Lower shear strength (0-9.4 oz in) sediment was measured with a manual torque gauge to an accuracy of 0.1 oz in (ounce-inch), and higher shear strength (6-25 oz in) sediment was measured with a digital torque gauge to an accuracy of 0.01 oz in. Shear strength measurements were later converted to kPa using equations described in Chaytor (2021), the associated publication. Shear strength measurements are generally within the expected ranges. At some depths, the sediment was waterlogged and was sheared with a torque less than expected. These instances were noted on the visual core description sheets (see larger work citation). Of the 24 cores collected during the Hugh R. Sharp HRS1209 cruise, 19 cores were measured for shear strength. Cores chosen for analysis were thought to represent the full range of sediments expected to be encountered. Omitted cores were not included because the coring locations were near previously analyzed cores. Jason D. Chaytor Megan S. Ballard Brian J. Buczkowski John A. Goff Kevin M. Lee Allen H. Reed Allyson A. Boggess 2021 1.0 Woods Hole Coastal and Marine Science Center, Woods Hole, MA U.S. Geological Survey, Coastal and Marine Hazards and Resources Program https://doi.org/10.1109/JOE.2021.3101013 Digital and/or Hardcopy 2021 publication date Chaytor (2021) Section B3 contains equations for unit conversion of undrained shear strength measurements. Each core was cut into sections on the ship during collection. The cores were then split into halves in the core lab. 2012 Jason D. Chaytor U.S. Geological Survey, Northeast Region Research Geologist mailing and physical

384 Woods Hole Road

Woods Hole MA 02543 US 508-548-8700 x2351 jchaytor@usgs.gov Shear strength was measured at the same time as the core visual description was completed. A 0.5-in (12.7-mm) diameter by 0.5-in (12.7-mm) high four-blade vane attached to a torque gauge was inserted into the sediment to a depth of 2 cm and rotated at a fixed rate until the sediment sheared. The torque gauge reading, measured in oz-in (ounce-inch) was recorded on the core description sheet. 2014 Allyson A. Boggess U.S. Geological Survey, NORTHEAST REGION Geologist mailing address

384 Woods Hole Road

Woods Hole MA 02543 US 508-548-8700 x2341 508-457-2310 aboggess@usgs.gov Torque gauge measurements were converted to undrained shear strength in kPa using a series of equations described by Chaytor (2021) and entered into a spreadsheet at its corresponding core depth. Chaytor (2021) 2021 Jason D. Chaytor U.S. Geological Survey, Northeast Region Research Geologist mailing and physical

384 Woods Hole Road

Woods Hole MA 02543 US 508-548-8700 x2351 jchaytor@usgs.gov HRS1209_UndrainedShearStrength.csv Comma Separated Value (CSV) file containing undrained shear strength data for piston cores collected from the Currituck Landslide Complex and upper slope adjacent to Baltimore Canyon. Producer Defined Depth_cm Down-core depth at which torque gauge measured undrained shear strength Producer Defined 5 810 centimeters HRS1209-1PC Shear strength (Su) of core HRS1209-1PC in kPa Producer Defined NaN Shear strength was not measured at this depth. Producer defined 4.1151 53.9366 kilopascals HRS1209-2PC Shear strength (Su) of core HRS1209-2PC in kPa Producer Defined NaN Shear strength was not measured at this depth. Producer defined 2.4690 21.3984 kilopascals HRS1209-3PC Shear strength (Su) of core HRS1209-3PC in kPa Producer Defined NaN Shear strength was not measured at this depth. Producer defined 1.6460 21.8099 kilopascals HRS1209-5PC Shear strength (Su) of core HRS1209-5PC in kPa Producer Defined NaN Shear strength was not measured at this depth. Producer defined 8.2301 29.2170 kilopascals HRS1209-6PC Shear strength (Su) of core HRS1209-6PC in kPa Producer Defined NaN Shear strength was not measured at this depth. Producer defined 4.5266 23.0444 kilopascals HRS1209-7PC Shear strength (Su) of core HRS1209-7PC in kPa Producer Defined NaN Shear strength was not measured at this depth. Producer defined 6.5841 196.1330 kilopascals HRS1209-8PC Shear strength (Su) of core HRS1209-8PC in kPa Producer Defined NaN Shear strength was not measured at this depth. Producer defined 5.3496 149.5514 kilopascals HRS1209-10PC Shear strength (Su) of core HRS1209-10PC in kPa Producer Defined NaN Shear strength was not measured at this depth. Producer defined 3.7036 25.5135 kilopascals HRS1209-11PC Shear strength (Su) of core HRS1209-11PC in kPa Producer Defined NaN Shear strength was not measured at this depth. Producer defined 2.8806 24.6904 kilopascals HRS1209-12PC Shear strength (Su) of core HRS1209-12PC in kPa Producer Defined NaN Shear strength was not measured at this depth. Producer defined 1.6460 122.5831 kilopascals HRS1209-13PC Shear strength (Su) of core HRS1209-13PC in kPa Producer Defined NaN Shear strength was not measured at this depth. Producer defined 4.1151 85.8082 kilopascals HRS1209-14PC Shear strength (Su) of core HRS1209-14PC in kPa Producer Defined NaN Shear strength was not measured at this depth. Producer defined 4.9381 128.7123 kilopascals HRS1209-15PC Shear strength (Su) of core HRS1209-15PC in kPa Producer Defined NaN Shear strength was not measured at this depth. Producer defined 5.3496 79.6790 kilopascals HRS1209-16PC Shear strength (Su) of core HRS1209-16PC in kPa Producer Defined NaN Shear strength was not measured at this depth. Producer defined 3.2921 30.4515 kilopascals HRS1209-17PC Shear strength (Su) of core HRS1209-17PC in kPa Producer Defined NaN Shear strength was not measured at this depth. Producer defined 6.9956 21.3984 kilopascals HRS1209-18PC Shear strength (Su) of core HRS1209-18PC in kPa Producer Defined NaN Shear strength was not measured at this depth. Producer defined 11.8843 181.4230 kilopascals HRS1209-19PC Shear strength (Su) of core HRS1209-19PC in kPa Producer Defined NaN Shear strength was not measured at this depth. Producer defined 5.2673 32.5255 kilopascals HRS1209-21PC Shear strength (Su) of core HRS1209-21PC in kPa Producer Defined NaN Shear strength was not measured at this depth. Producer defined 2.3044 107.8732 kilopascals HRS1209-23PC Shear strength (Su) of core HRS1209-23PC in kPa Producer Defined NaN Shear strength was not measured at this depth. Producer defined 5.4977 41.7104 kilopascals U.S. Geological Survey - ScienceBase mailing and physical

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Denver CO 80225 United States 1-888-275-8747 sciencebase@usgs.gov The dataset includes the data files (HHRS1209_UndrainedShearStrength.csv), the browse graphic (HRS1209_BrowseGraphic.jpg), and the FGDC CSDGM metadata in XML format (HRS1209_UndrainedShearStrength.xml). Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. CSV Microsoft Excel 2008 The dataset contains the undrained shear strength data in CSV format. 0.012 https://www.sciencebase.gov/catalog/file/get/6436e5f8d34ee8d4addcb359 https://www.sciencebase.gov/catalog/item/6436e5f8d34ee8d4addcb359 https://doi.org/10.5066/P9H74BAX The first link is to download the data in a ZIP file. The second link is to the dataset landing page where files can be downloaded individually. The third link is to the main landing page of the data release. None 20230605 Allyson A. Boggess U.S. Geological Survey, NORTHEAST REGION Geologist mailing address

384 Woods Hole Road

Woods Hole MA 02543 US 508-548-8700 x2341 508-457-2310 whsc_data_contact@usgs.gov The metadata contact email address is a generic address in the event the person is no longer with USGS. FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998