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 ...

Claudio Berti, director of the Idaho Geological Survey, was driving from Moscow to Boise for an Idaho Emergency Management ...

A 4.1-magnitude earthquake was reported in Alaska on Thursday (January 16), according to the United States Geological Survey. The earthquake was centered in Valdez at a depth of 4.0 kilometers ...

A 3.4-magnitude earthquake occurred near Boulder, Utah, with minimal impact and no reported significant damages or injuries.