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.

T (yr)

Required number in yr. Recurrence interval.

d_last (m)

Required number in m. Previous slip.

ṡ (m/yr)

Required number in m/yr. Loading rate.

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

Check whether observed recurrence interval and slip are consistent with a loading-rate-driven recurrence model. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

d_pred (m)

Returned number in m. Predicted slip.

Consistent

Returned boolean. Whether predicted slip meets or exceeds previous slip.

• 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.
• T must be at least 0.
• d_last must be at least 0.
• ṡ 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.

• Recurrence Interval Slip Rate Event Slip Calculator

  Characteristic recurrence from per-event slip and long-term slip rate: T = D/V.

• Repeating Pair Slip Compatibility Checker

  Check whether two repeating events' implied slips are compatible given their areas and moments.

• Elapsed Time Last Event Segment Checker

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