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.

M

Required number. Event magnitude.

Offshore?

Required boolean. Whether the source lies under water.

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

Screen whether an event magnitude exceeds common tsunamigenic thresholds for its setting. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

Likely

Returned boolean. Whether a damaging tsunami is plausible.

M_thr

Returned number. Threshold used for the setting.

• 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 Stress Phase Trigger Checker

  Check whether an event's tidal phase falls in the promoting window for its fault style.

• Basin Edge Surface Waves Checker

  Screen whether the bedrock-to-basin shear-wave velocity contrast reaches an illustrative 2:1 threshold associated with stronger basin-edge effects; geometry is not modeled.

• 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.