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_sing

Required integer. Unassociated events.

n_clust

Required integer. Events assigned to clusters.

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

Cluster-analysis quality screen: fraction of unassociated singletons in a detected cluster set. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

f_sing

Returned number. Singletons over total events.

Quality

Returned string. Association quality 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_sing must be at least 0.
• n_clust 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.

• Asperity Area Fraction Scaling Calculator

  Asperity area fraction A_a/A₀ as a power-law function of seismic moment, capped at the physical upper bound of one.

• Attenuation Quality Factor Q Calculator

  Infer quality factor Q from amplitude decay along a propagation path: A = A₀·exp(−π f x / (Q v)).

• Basin Edge Surface Waves Checker

  Screen whether the bedrock-to-basin shear-wave velocity contrast reaches an illustrative 2:1 threshold associated with stronger basin-edge effects; geometry is not modeled.