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.

SH (counts)

Required number in counts. Transverse motion amplitude.

Z (counts)

Required number in counts. Vertical motion amplitude.

R (counts)

Required number in counts. Radial motion amplitude.

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

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. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

Wave type

Returned string. Love, Rayleigh, or mixed classification.

• 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.

• Love Wave Dispersion Period Speed Lookup

  Illustrative fundamental-mode Love-wave phase-speed bands for a generic continental crust. Real dispersion must be calculated from a site-specific velocity model.

• Surface Wave Magnitude VK20 Formula Calculator

  Classic vertical-component Rayleigh surface-wave magnitude Ms = log10(A/T) + 1.66·log10(Δ°) + 3.3 with A in micrometres; nanometre input is converted to µm internally.

• 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.