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.

Seismic moment

Seismic moment in newton meters.

Hanks-Kanamori moment magnitude Mw = (2/3)(log10 M0 - 9.1) with seismic moment M0 in newton meters. 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]

Mw

Moment magnitude Mw (dimensionless).

• Seismic magnitudes, moments, travel times, velocities, resolution, and energy depend on instrument correction, Earth model, phase picking, geometry, attenuation, radiation pattern, bandwidth, and calibration range. Magnitude scales are not universally interchangeable.
• 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.

• Seismic Moment Calculator

  Seismic moment M0 = mu * A * D with rigidity in pascals, rupture area in square meters and average slip in meters; result in newton meters.

• 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.

• Gutenberg Richter B Value Calculator

  Aki (1965) maximum-likelihood b value of the Gutenberg-Richter law log10 N = a - bM: b = log10(e) / (mean magnitude - completeness magnitude).