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.

Elastic thickness (m)

Effective elastic thickness of the lithosphere in metres.

Young's modulus (Pa)

Young's modulus in pascals; default 7e10 (typical lithospheric value).

Poisson's ratio

Poisson's ratio; default 0.25 (typical lithospheric value).

Flexural rigidity of an elastic lithospheric plate: D = E * Te^3 / (12 * (1 - nu^2)). 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]

Flexural rigidity (N*m)

Flexural rigidity in newton-metres.

• 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.

• Elastic Thickness Calculator

  Convert lithospheric elastic thickness to flexural rigidity D = E Te^3 / (12 (1 - nu^2)) with Te in meters, Young's modulus in pascals and rigidity in newton meters.

• Fracture Pressure Gradient Eaton Calculator

  Estimate the fracture pressure gradient with the Eaton (1969) relation FG = Pp + nu/(1-nu) * (Sv - Pp).

• Mineral Streak Lookup

  Look up the characteristic color of a mineral's powder as it would appear on a streak plate.