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.

n_keep

Required integer. Background events kept.

n_drop

Required integer. Clustered events removed.

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

Fraction of the catalog retained as Poissonian background after declustering. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

f

Returned number. Retained share of the original catalog.

Band

Returned string. Typical retention band.

• 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.
• n_keep must be at least 0.
• n_drop 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.

• Cumulative Moment Release Catalog Summary

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

• Catalog Magnitude Type Histogram Summary

  Count catalog magnitudes by reported type (ml, mb, ms, mw, other).

• Double Difference Pair Mean Offset Summary

  Summarize double-difference relocation pairs: mean and RMS inter-event separation.