Table T1. Integrated Ocean Drilling Program (IODP) depth scales used during Expedition 348.
| Depth scale | Depth scale name | Acronym | Datum | Description |
Previous unit |
Type depth |
|---|---|---|---|---|---|---|
| Drillers | 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 | 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 | 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 | 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 |
| Seismic | 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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