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.

ζ

Required number. Damping ratio.

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

Classify instrument damping against the maximally-flat ζ = 0.707 benchmark. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

Regime

Returned string. Under/critical/over-damped classification.

Flat

Returned boolean. Whether ζ matches the 0.707 benchmark within 2%.

• 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.
• ζ 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.

• Damping Response Spectrum Heuristic Scaling

  Heuristic spectral scaling from 5% to another damping ratio: F = (0.05/ζ)^0.25.

• Elapsed Time Last Event Segment Checker

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

• Fault Seismic Moment Deficit Calculator

  Compare seismic moment captured over a window against the tectonic budget μ·A·V·T.