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doi:10.2204/iodp.proc.345.103.2014 Visual surveysFourteen visual surveys of the seafloor were conducted during Expedition 345 (Table T1). Archived video is available from the IODP Data Librarian. For all surveys, the vibration isolated television (VIT)-mounted camera (Fig. F1) was placed 2–5 m above the bottom of the drill string, with the drill string 2–5 m above the seafloor. Observations of the nature of the seafloor (e.g., monotonous sediment or surficial rubble) and periodic estimations of the regional slope using the VIT-mounted Mesotech sonar were recorded. For exploratory surveys, a predetermined track was followed to cover a region of interest. For targeted surveys, the drill string and VIT moved from an abandoned hole to a new location. When a specific site was deemed acceptable for drilling, a box survey expanding 5–10 m from the origin was conducted to ensure that the seafloor was free of surface rubble. Typically, the drill string made two or more seafloor tags during the box survey to confirm depth and assess the local slope. |
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