Earthquakes and seismic activity often happen with sudden movements underground with tectonic plates. Seismographs are used by scientists to measure the time, location and strength of an earthquake.

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 ...

Scientists measure both the energy released in an earthquake and its damage. In 1902, Italian scientist Giuseppe Mercalli introduced a scale that measures the intensity of an earthquake based on its ...

Earthquakes are natural phenomena caused by the sudden release of energy in the Earth’s crust, resulting in seismic waves. The magnitude of an earthquake is measured using the Richter scale, which ...

VANCOUVER, B.C. (KOMO) — The North Pacific by British Columbia's Vancouver Island was rattled by a series of earthquakes Thursday morning, the largest quake measured as 6.4 magnitude. According to the ...