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.

D (m)

Required number in m. Slip per event.

V (mm/yr)

Required number in mm/yr. Long-term slip rate.

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

Characteristic recurrence from per-event slip and long-term slip rate: T = D/V. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

T (yr)

Returned number in yr. Recurrence interval.

Note

Returned string. Closure caveat.

• 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.
• D must be at least 0.
• V 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.

• Slip vs Time Predictable Checker

  Check whether observed recurrence interval and slip are consistent with a loading-rate-driven recurrence model.

• Elapsed Time Last Event Segment Checker

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

• Offset Feature Cumulative Slip Per Event Calculator

  Average per-event slip from cumulative offset divided by the number of events recorded.