Magnitude is a scale for the earthquake strength. The magnitude becomes bigger, the earthquake will become bigger.

log_{10}E = 4.8 + 1.5M

Here, log means "logarithm", E means energy(Jule), M means magnitude.

### Magnitude and Energy

+1 in magnitude means 32 times in energy.

- Magnitude 8 : 32 times of Magnitude 7
- Magnitude 7.2 : 2 times of Magnitude 7

The Higashi Nihon (East Japan) Earthquake on March 11, 2011 was magnitude 9.0

### Comparing two Earthquakes

Updated: