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Table T2. IODP depth scales summary table.

  Depth scale name Acronym Datum Description Previous
unit
Type depth
Drillers depth scales   Drilling depth below rig floor DRF Rig floor The sum of lengths of all drill string components deployed beneath the rig floor. Includes length of all components and the portions thereof below rig floor. mbrf   Measured
Drilling depth below seafloor DSF Seafloor The length of all drill string components between seafloor and target. mbsf   Processed
LWD and MWD depth scales   LWD depth below rig floor LRF Rig floor The sum of lengths of all drill string components deployed beneath the rig floor reference. mbrf Measured
LWD depth below seafloor LSF Seafloor The length of all drill string components between seafloor and target. mbsf Processed
Mud depth scales   Mud depth below rig floor MRF Rig floor The length of all drill string components between where cuttings and gas originate and the rig floor based on lag time of arrival at rig floor and mud pump rate. NA Processed
Mud depth below seafloor MSF Seafloor MRF with seafloor depth below rig floor subtracted. NA Processed
Core depth scales   Core depth below seafloor CSF-A Seafloor Distance from seafloor to target within recovered core. Combines DSF to top of cored interval with curated section length to target within cored material. This method allows overlap at cored interval and section boundaries. mbsf Processed
Core depth below seafloor CSF-B Seafloor Distance from seafloor to target within recovered core. Combines DSF to top of cored interval with curated length to target within cored material. This method applies compression algorithm (i.e., scaling) if recovery is >100%.   Processed
Composite depth scales Core composite depth below seafloor CCSF Seafloor Distance from seafloor to target within recovered core using a scale of adjusted depths constructed to resolve gaps in the core recovery and depth inconsistencies. mcd Composite
Seismic depth scales   Seismic depth below seafloor SSF Seafloor Distance below seafloor and target derived from seismic traveltime, velocity, and water depth. m Processed
Seismic depth below sea level SSL Sea level Distance below sea level derived from seismic traveltime and velocity. m Processed

LWD = logging while drilling, MWD = measurement while drilling. NA = not applicable. See IODP Depth Scale Terminology at www.iodp.org/program-policies/procedures/guidelines/.

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