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_b

Required number. Body-wave magnitude.

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

Bandwise mb-to-Mw conversion with a saturation note above mb ≈ 6.5. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

M_w

Returned number. Converted moment magnitude.

Note

Returned string. Saturation guidance.

• 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.

• Bath Law Largest Aftershock Gap Note Lookup

  Båth's law: the largest aftershock sits about 1.2 magnitude units below its mainshock.

• Brune Displacement Spectrum Peak Frequency Note

  For the Brune model, displacement amplitude peaks exactly at the corner frequency.

• Critical Reflection Angle Post Critical Note Checker

  Critical angle for a reflecting interface from velocity contrast, with post-critical guidance.