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.

symbol

Required string. Constituent symbol (M2, S2, N2, K1, O1).

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

Periods of the principal tidal constituents relevant to tidal-triggering studies. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

T (h)

Returned number in h. Constituent period.

Species

Returned string. Semidiurnal or diurnal.

• 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.

• Tidal Harmonic Residual RMS Calculator

  RMS and peak residual between observed tide-gauge series and a harmonic prediction.

• Amplification Borcherdt Factor Lookup

  Borcherdt-style short-period amplification factor from NEHRP class.

• DART Pressure Tsunami Flag Checker

  Flag DART bottom-pressure observations whose amplitude and period band match a tsunami signature.