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 ...

(WHTM) – Earthquakes are large seismic events that occur when tectonic plates manage to move under, over or slide past each other, sending energy in waves across the Earth’s crust. But how are ...

The initial magnitude scale was established by Greek astronomer Hipparchus around 135 B.C.E., categorizing approximately 850 stars into six ranges from 1st (brightest) to 6th (faintest) magnitude.

Sept 12 (Reuters) - A powerful quake measuring 7.9 struck near Indonesia's Sumatra island on Wednesday triggering tsunami warnings in Indonesia, Malaysia, India and Sri Lanka, officials said.

One of the most commonly known earthquake-measuring tools is the Richter Scale, but the system is no longer used today. In fact, the Richter scale was replaced in the 1970s by other magnitude scales ...

Monday afternoon, a 5.8 earthquake centered 15 miles northeast of Yerington hit just after 3 p.m., rattling windows and nerves as far away as Sacramento and San Francisco. Aftershocks continued to be ...

2.5 or less Earthquakes are usually not felt but can be recorded by a seismograph. 2.5 to 5.4 The event is often felt but only causes minor damage. 5.5 to 6.0 There is slight damage caused to ...