Datum correction

{
  "id": "MLC-T-OAG-000957",
  "term": "Datum correction",
  "field": "Oil and gas",
  "definition": "A set of adjustments applied to raw seismic or gravity data to remove the effects of elevation and near-surface variations, effectively shifting all measurements to a single horizontal reference plane. The correction accounts for the time seismic waves spend traveling through the low-velocity weathered layer and for elevation differences between source and receiver stations. This process uses a replacement velocity to mathematically substitute the material between the surface and the datum.",
  "subject": "Geophysics",
  "url": "https://mlchart.com/terminology/oil-and-gas/datum-correction/"
}