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Table T1. 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
Wireline depth scales     Wireline log depth below rig
floor 		WRF Rig floor Length of wireline and sensor offset between the rig floor and the target. mbrf Measured
Wireline log depth below
seafloor		 WSF Seafloor WRF with seafloor depth below rig floor subtracted. mbsf Processed
Wireline log speed-corrected
depth below seafloor		 WSSF Seafloor WSF corrected with accelerometer data. mbsf Processed
Wireline log matched depth
below seafloor 		WMSF Seafloor Depth derived by correlation between reference run and another run to make a set of WSF runs
internally consistent. 		mbsf 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/.

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