A moderately strong, 5.5-magnitude earthquake struck in Ethiopia on Sunday, according to the United States Geological Survey.

II Felt by a few people, especially on upper floors. III Noticeable indoors, especially on upper floors, but may not be recognized as an earthquake. IV Felt by many indoors, few outdoors. May feel ...

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 light, 4.1-magnitude earthquake struck in Southern California on Sunday, according to the United States Geological Survey.

The earthquake hit on Sunday at 1:03 p.m. It was followed by a magnitude 2.5 earthquake a minute later, and magnitude 3 and ...