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 (s)

Required number in s. Period.

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

Illustrative fundamental-mode Love-wave phase-speed bands for a generic continental crust. Real dispersion must be calculated from a site-specific velocity model. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

c (km/s)

Returned number in km/s. Phase velocity.

Regime

Returned string. Dispersion regime note.

• 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.
• 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.

• Fracturing Monitor Magnitude Reporting Lookup

  Illustrative local-magnitude bands for hydraulic-fracturing monitoring. Traffic-light thresholds are jurisdiction- and project-specific, so operational decisions must use the approved site protocol.

• Air Coupled Rayleigh Wave Speed Calculator

  Rayleigh wave speed from shear velocity (≈0.92·β for ν = 0.25) compared with the speed of sound in air.

• Love vs Rayleigh Motion Classifier

  Screen surface-wave component amplitudes for Love-like SH dominance or Rayleigh-like P-SV dominance. Amplitudes alone cannot determine ellipticity or retrograde phase motion.