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.

a_i

Required list. Acceleration samples.

Δt (s)

Required number in s. Sampling interval.

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

CAV = Σ|a|·Δt over uniformly sampled acceleration. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

CAV (m/s)

Returned number in m/s. Cumulative absolute velocity.

• 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.
• Δt 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.

• Response Spectrum Corner Period Band Lookup

  Acceleration- and velocity-controlled period bands scaled by magnitude class.

• VS30 Time Averaged Shear Velocity Calculator

  Time-averaged shear velocity over the top 30 m: VS30 = 30 / Σ(dᵢ/Vsᵢ).

• 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.