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.

Fault model

Required boolean. Identified active faults with slip rates?

Recurrence

Required boolean. Recurrence/catalog statistics available?

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

Recommend DSHA or PSHA based on available fault characterization and recurrence data. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

Approach

Returned string. Recommended analysis framework.

Why

Returned string. Rationale for the recommendation.

• 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.
• 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.

• Characteristic Earthquake Magnitude Window Lookup

  Estimate characteristic magnitude from a fault length using the Wells & Coppersmith strike-slip relation.

• Coda Q Scattering Intrinsic Split Calculator

  Split total attenuation into intrinsic and scattering parts via 1/Q_total = 1/Q_intrinsic + 1/Q_scattering.

• Elapsed Time Last Event Segment Checker

  Compare elapsed time since the last segment rupture against the mean recurrence interval.