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.

style

Required string. strike-slip, normal, or reverse.

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

Shortcut P/T axis plunges for ideal focal styles (strike-slip, normal, reverse). Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

P plunge (°)

Returned number in °. P-axis plunge for the ideal style.

T plunge (°)

Returned number in °. T-axis plunge.

Note

Returned string. Geometry note.

• 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.

• Synthetic Strike-Slip Polarity Data Generator

  Generate synthetic P-wave polarity training data for a strike-slip-dominant focal mechanism.

• Average Radiation Factor Boore Boatwright Lookup

  Boore-Boatwright style average radiation factors for P and S waves over the focal sphere.

• Strike-Slip Seismic Moment and Average Dislocation Estimate

  Seismic moment and average dislocation estimate for a strike-slip rupture: geodetic moment M₀ = μ·A·ū and a half-slip (ū/2) offset scale; this heuristic does NOT compute the Okada (1992) elastic half-space spatial displacement field.