When an earthquake occurs, authorities give the public an idea of the quake's power by listing its magnitude and intensity.

About 55 earthquakes a day – 20,000 a year – are recorded by the National Earthquake Information Center. Most are tiny and barely noticed by people living where they happen. But some are strong enough ...

Earthquakes, especially those of the highest magnitude, pose a major global risk due to their sudden onset and limited predictability, which can lead to extensive damage and loss of life without prior ...