Converter
logarithmic earthquake magnitude
moment magnitude
exact
- Record
- M668
- Definition quality
- Standardized
- Conversion mode
- formula
- Calculator
- Formula-based
Generic 'Richter scale' should not be used as the label for all modern earthquake magnitude reporting.
Definition
Moment magnitude is based on seismic moment; USGS gives Mw = 2/3(log10(M0[N·m]) − 9.1).
Reference value
moment magnitude converts through a formula rather than a simple multiplier.
Modern use
Modern use is context-dependent and varies by region or measurement system.
Sources & evidence
Source tier — · confidence high