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.

Δx

Required list. Pair east offsets.

Δy

Required list. Pair north offsets.

Δz

Required list. Pair depth offsets (positive down).

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

Summarize double-difference relocation pairs: mean and RMS inter-event separation. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

d̄ (km)

Returned number in km. Mean 3-D pair separation.

rms_h (km)

Returned number in km. RMS horizontal offset.

N

Returned integer. Number of pairs.

• 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.

• Cumulative Moment Release Catalog Summary

  Total moment and equivalent single-event magnitude of an event list.

• Declustering Retained Event Fraction Summary

  Fraction of the catalog retained as Poissonian background after declustering.

• Elapsed Time Last Event Segment Checker

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