Use this seismology calculation to reproduce a stated convention, screen observations, or compare scenarios whose units, coordinate conventions, catalog selection, and model assumptions are known.

A (m²)

Required number in m². Plan-view scar area.

α

Optional number. Scaling prefactor.

γ

Optional number. Scaling exponent.

The cited overview of Seismology supplies background for the terminology and domain context used by this tool.^[1]

Empirical area-volume scaling for seismically triggered landslides: V = α·A^γ (Guzzetti-like). Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

V (m³)

Returned number in m³. Estimated mobilized volume.

d_eq (m)

Returned number in m. Volume-over-area equivalent depth.

• Earth structure, source geometry, path effects, site response, instrument response, catalog completeness, uncertainty, and the fitted range can dominate the accuracy of simplified seismic calculations.
• A must be at least 0.
• Use finite inputs in the displayed units, preserve source measurements and assumptions, and independently verify consequential decisions.

For analysis or hazard decisions, retain uncertainty and provenance and compare the result with waveform processing, calibrated regional models, and guidance from qualified seismologists or the responsible agency.

• Asperity Area Fraction Scaling Calculator

  Asperity area fraction A_a/A₀ as a power-law function of seismic moment, capped at the physical upper bound of one.

• Aftershock Zone Length Utsu Scaling Calculator

  Utsu aftershock-zone scaling: log₁₀L(km) = 0.5·M − 1.8, with equivalent area.

• Felt Radius Heuristic Log Scaling Calculator

  User-parameterized log-linear felt-radius screen R = R₀·10^(kM). The default R₀=0.1 km and k=0.5 are illustrative and must be calibrated for regional attenuation, depth, and reporting conditions.