The earthquake occurred at 11:37 p.m. (mst) with a Richter magnitude estimated between 7.3 and 7.5.

With a Richter magnitude of 5.8, it remains the most powerful earthquake historically recorded in the state of Texas.

This give us their Richter magnitude, their depth, their long.

Twelve earthquakes with a Richter magnitude of over seven have occurred within the last century.

There have been several thousand aftershocks since, and more than thirty of which had a Richter magnitude greater than 3.5.

The Richter magnitude is measured from the maximum amplitude of recorded ground motion.

There are frequent earthquakes below Richter magnitude 2.

Prior to the development of the Richter magnitude, it was difficult to measure the size of an earthquake.

How do you give a Richter magnitude to earthquakes that occurred prior to the scale?

The Richter magnitude is calculated from the amplitude of the largest seismic wave recorded for the earthquake.