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.

L (km)

Required number in km. Array aperture.

p_min (s/°)

Required number in s/°. Fastest apparent velocity slowness.

p_max (s/°)

Required number in s/°. Slowest slowness of interest.

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

Check whether array aperture resolves the expected moveout across the slowness band. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

Δt (s)

Returned number in s. Moveout difference across the band.

Resolves?

Returned boolean. Whether span exceeds one sample at 20 Hz.

• 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.
• L must be at least 0.
• p_min must be at least 0.
• p_max 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.

• Microtremor Array Resolution Frequency Band Checker

  Check that array aperture brackets the wavenumbers of the target frequency band for SPAC/f-k dispersion work.

• Magnitude Scaling Saturation Check Tool

  Flag whether a rupture length implies magnitude beyond the empirical saturation limit (~M7.8) of simple linear scaling.

• Repeating Pair Slip Compatibility Checker

  Check whether two repeating events' implied slips are compatible given their areas and moments.