A major, 7.6-magnitude earthquake struck in the Caribbean Sea on Saturday and triggered a tsunami advisory in Puerto Rico and ...

I Felt by very few people; barely noticeable. 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 ...

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

Another scale is based on the physical size of the earthquake fault and the amount of slip that occurred. Then there are also measures of earthquake shaking intensity. The intensity from one ...

It's 19% for a magnitude 4 or higher, 2% for a magnitude 5 and above, and less than 1% for a magnitude 6 or 7 earthquake. The Malibu area quake struck around 7:28 a.m. at a depth of nearly six miles.

How the strength of quakes is measured has changed over the years, so you'll see references to the Richter Scale, earthquake magnitude and intensity. Here's a quick primer on what they mean and ...