Another way to measure the strength of an earthquake is to use the observations of the people who experienced the earthquake, and the amount of damage that occurred, to estimate its intensity. The ...

An curved arrow pointing right. The discovery of two skeletons in the ruins of Pompeii suggests powerful earthquakes accompanied the devastating eruption of Mount Vesuvius 2,000 years ago.

Shaking categories are based on the Modified Mercalli Intensity scale. When aftershock data is available, the corresponding maps and charts include earthquakes within 100 miles and seven days of ...