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.

Δu (m)

Required number in m. Static slip.

τ (s)

Required number in s. Slip rise time.

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

Fling-step peak velocity from static slip and rise time: v ≈ Δu / τ. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

v_fling (m/s)

Returned number in m/s. Fling-step peak velocity.

• 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.
• Δu must be at least 0.
• τ 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.

• Source Rise Time Dislocation Calculator

  Characteristic source timescale estimated as fault width divided by shear-wave velocity; this is a dimensional proxy, not a fitted rupture rise-time model.

• Characteristic Earthquake Magnitude Window Lookup

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

• Depth Conversion Average Velocity Method Calculator

  Convert an event's one-way time to depth with a constant average velocity.