What formula is used to calculate seismic energy?

The tool uses the Gutenberg-Richter empirical relation: log₁₀(E) = 1.5 × M + 4.8, where E is energy in joules and M is the magnitude. This gives E = 10^(1.5M + 4.8) joules.

What is the difference between Richter scale and Moment Magnitude?

The original Richter magnitude (ML) was designed for local earthquakes in California. The Moment Magnitude Scale (Mw) is the modern standard used worldwide and works accurately for all earthquake sizes. For moderate quakes (M 3–7) the values are nearly identical; Mw is preferred for large or great earthquakes.

How many times more energy does each magnitude step release?

Because the formula uses an exponent of 1.5, each whole-number increase in magnitude releases 10^1.5 ≈ 31.6 times more energy. So a magnitude 8.0 quake releases about 1,000 times more energy than a magnitude 6.0 quake.

Why is the result expressed in TNT equivalent?

TNT equivalent (tonnes or megatons) is a familiar unit used for nuclear weapons and large explosions. One tonne of TNT = 4.184 × 10⁹ joules. Expressing seismic energy in TNT gives an intuitive sense of scale.

What was the most energetic earthquake ever recorded?

The 1960 Valdivia earthquake in Chile holds the record at Mw 9.5. This tool estimates its energy at roughly 1.1 × 10¹⁹ joules, equivalent to about 2,680 megatons of TNT or roughly 178,000 Hiroshima atomic bombs.

Does this account for the energy felt at the surface?

No. The formula estimates total seismic wave energy radiated from the source. Only a fraction of that energy reaches the surface and is felt as shaking. Site conditions, depth, and distance all affect ground motion independently.

Earthquake Energy Calculator

Enter an earthquake magnitude to instantly see the seismic energy released in joules, TNT equivalent, and real-world comparisons.

Earthquake Magnitude

Magnitude Scale

Magnitude Value (0.0 – 10.0)

0.05.010.0

Famous Earthquakes

Enter a magnitude on the left to see the energy released.

Summary

This tool calculates the total seismic energy released by an earthquake given its magnitude on either the Richter scale or the Moment Magnitude Scale (Mw). The result is shown in joules, petajoules, and TNT equivalent (tonnes and megatons), along with relatable real-world comparisons such as atomic bombs or hurricane energy. The underlying formula is the Gutenberg-Richter energy-magnitude relation: log₁₀(E) = 1.5M + 4.8, yielding energy in joules.

How it works

Enter the earthquake magnitude (0.0 to 10.0) in the input field.
Choose whether the value is a Richter (ML) or Moment Magnitude (Mw) — for most modern earthquakes these are interchangeable.
The calculator applies the Gutenberg-Richter relation: E = 10^(1.5 × M + 4.8) joules.
Results are displayed in joules, petajoules, TNT equivalent, and compared to familiar energy benchmarks.
Use the quick-select buttons to load famous historical earthquake magnitudes instantly.

Use cases

Understand the enormous energy difference between a magnitude 6.0 and a magnitude 9.0 quake.
Convert seismic magnitude to TNT equivalent for science reports or presentations.
Compare historical earthquakes by their released energy.
Teach the logarithmic nature of the magnitude scale in a classroom setting.
Estimate seismic energy for engineering risk assessments.
Satisfy curiosity after feeling a tremor — how powerful was it really?

Frequently Asked Questions

Last updated: 2026-05-23 · Reviewed by Nham Vu