Seismic Magnitude Converter

Convert seismic magnitude to energy released (Joules, TNT equivalent) and Modified Mercalli Intensity (MMI).

Earthquake Magnitude

Magnitude Scale

Tab to move between fields

Magnitude

Energy Released

1,995,000,000,000 J

MMI (Mercalli Intensity)

ScaleRichter (ML)

TNT Equivalent476.88 tons

Intensity DescriptionVery strong

Energy Ratio vs M4.031.62×

Approx. Global/Year1,300

How to Use This Calculator

Enter the Earthquake Magnitude value from seismograph recordings.
Select the Magnitude Scale: Richter (ML) for local earthquakes or Moment Magnitude (Mw) for global events.
Review Energy Released in Joules and the TNT Equivalent to grasp the scale of energy.
Check the Modified Mercalli Intensity (MMI) and its description to understand felt shaking severity.
Use Energy Ratio vs M4.0 to appreciate the logarithmic nature of the magnitude scale.

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Formula

E = 10^(1.5M + 4.8) Joules

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