Use this geological calculation for a transparent first-pass interpretation of measured rock, soil, fluid, well, stratigraphic, isotopic, geophysical, or seismic data under an explicitly selected model.

Subsidence (m)

Total subsidence of the interval in metres.

Duration (Myr)

Duration of the interval in millions of years.

Average tectonic-plus-loaded subsidence rate over an interval: amount divided by duration. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Subsidence rate (m/Myr)

Mean subsidence rate in metres per million years.

• Gravity, magnetic, flexural, and subsidence interpretations are non-unique and depend on datum, corrections, density or susceptibility contrasts, regional removal, geometry, elastic assumptions, and noise. A corrected anomaly is not a unique subsurface model.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Compare independent measurements and models, retain units and analytical metadata, propagate uncertainty, and validate interpretations against logs, cores, maps, laboratory data, or field observations.

• Air Loaded Subsidence Calculator

  Air-loaded tectonic subsidence with the water column replaced by air (zero load): Y = S(rho_m - rho_s)/rho_m - Wd.

• Backstripping Subsidence Calculator

  Water-loaded backstripped tectonic subsidence (Steckler & Watts 1978) with a eustatic correction: Y = S(rho_m - rho_s)/(rho_m - rho_w) - Wd + dSL * rho_w/(rho_m - rho_w). Positive sea-level change means past sea level was higher than present.

• Sedimentation Rate Calculator

  Average sedimentation (accumulation) rate from compacted sediment thickness divided by deposition time; reported in m/Myr and cm/kyr.