Proc. IODP, 317, Methods

Table T1. IODP depth scale terminology, Expedition 317.

Depth scale name	Acronym	Origin	Method description	Submethod	Unit	Previous name	Previous unit
Drillers depth scale
Drilling depth below rig floor	DRF	Drill floor	Add the lengths of all drill string components deployed beneath the rig floor, from bit to the point on the rig floor where the length of the deployed portion of the last string is measured.	Describe submethod of measuring drill string component length and length deployed at rig floor	m	Depth	mbrf
Drilling depth below seafloor	DSF	Seafloor	Subtract the distance between rig floor and seafloor, estimated by one of several submethods, from the drilling depth below rig floor (DRF)	A. Tag seafloor	m	Depth	mbsf
				B. Mudline core
				C. Visual control
				D. Inherit depth
				E. Other
Core depth scale
Core depth below seafloor	CSF	Seafloor	Measure core sample or measurement offset below the core top and add it to the core top's drilling depth below seafloor; apply one of the submethods.	A. Let overlap if long	m	Depth	mbsf
				B. Scale if long
				C. Other
Core composite depth	CCSF	Seafloor	Align cores from one hole or multiple adjacent holes based on one of the submethods. The result is a newly constructed depth scale.	A. Append if long	m	Depth	mcd
				B. Scale by factor
				C. Correlate features
				D. Splice
				E. Other
Wireline depth scale
Wireline log depth below rig floor	WRF	Drill floor	Measure length of wireline extended beneath the rig floor.	Describe submethod	m	Depth	mbrf
Wireline log depth below seafloor	WSF	Seafloor	Subtract the distance between rig floor and seafloor, estimated by one of several submethods, from the wireline log depth below rig floor (WRF)	A. Seafloor signal	m	Depth	mbsf
				B. Drilling depth
				C. Inherit depth
				D. Other
Wireline log speed-corrected depth below seafloor	WSSF	Seafloor	Correction for irregular motion of the tool during logging using accelerometer data; used for high-resolution logs such as microresistivity (FMS).	Describe submethod if applicable	m	Depth	mbsf
Wireline log matched depth below seafloor	WMSF	Seafloor	Pick log data from one run as a reference and map other run data using several tie points.	Describe reference log and number/type of tie points used	m	Depth	mbsf

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