Since 1935, several other magnitude scales have been developed.

What are the different magnitude scales, and why are there so many?

The major quake lasted one minute and was swiftly followed by a series of aftershocks ranging from 5.6 to 6.9 on the magnitude scale.

What is the difference between intensity scales and magnitude scales?

This measure should not be confused with the astronomical magnitude logarithmic scale of brightness.

The apparent magnitude scale varies as 2.5 times the (base-10) logarithm of the brightness.

His motivation for creating the local magnitude scale was to compare the size of different earthquakes.

All magnitude scales have been designed to give numerically similar results.

Rather, magnitude scales are used to estimate with one number the size of the quake.

The photographic magnitude scale is now considered obsolete.