Earthquake Magnitude Scale Magnitude Earthquake Effects Estimated Number Each Year 2.5 or less Usually not felt, but can be recorded by seismograph. Millions 2.5 to 5.4 Often felt, but only causes ...

There are a number of ways to measure the magnitude of an earthquake. Most scales are based on the amplitude of seismic waves recorded on seismometers. These scales account for the distance between ...

A minor, 3.8-magnitude earthquake struck in the Gulf of Maine on Monday, according to the United States Geological Survey.

The magnitude 3.8 earthquake that happened Monday morning is one of the most powerful earthquakes to hit Maine in the past 30 ...