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.

Mechanism

Required string. basal-stick-slip, crevasse, or calving.

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

Characteristic magnitude ranges for glacial earthquake mechanisms. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

M_lo

Returned number. Lower magnitude bound.

M_hi

Returned number. Upper magnitude bound.

Note

Returned string. Mechanism note.

• 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.

• Characteristic Earthquake Magnitude Window Lookup

  Estimate characteristic magnitude from a fault length using the Wells & Coppersmith strike-slip relation.

• B Value Standard Error Shi Bolt Formula

  Shi & Bolt (1982) b-value uncertainty, simplified for unit-variance magnitude residuals: σ_b = 2.30·b²/√(N−1); supply magnitude residuals for the full Σ(Mᵢ−M̄)² form.

• 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.