An earthquake is a sudden shaking or rolling of the ground caused by movements under the earth's surface. Some earthquakes can be mild while others may be severe causing massive devastation to structures, life and other ... More »

The National Earthquake Information Center determines the location and size of earthquakes worldwide and distributes this information. It also provides a database for information regarding seismic activity and researches... More »

www.reference.com Science Earth Science Earthquakes

Earthquakes occur due to the movement of tectonic plates in the Earth's crust. Plates constantly shift and move, building energy. The release of that energy is an earthquake. More »

www.reference.com Science Earth Science Earthquakes

A seismometer measures movements in the ground during an earthquake and creates electric signals that can be read to determine an earthquake's magnitude. Seismometers are contained within a device called a seismograph th... More »

An earthquake is a violent shaking of the ground that often causes destruction to life and property. An earthquake occurs when two parts of earth slip past one another, creating seismic waves. Some areas are especially p... More »

www.reference.com Science Earth Science Earthquakes

The three types of earthquake waves are primary waves, secondary waves and surface waves. Primary waves are referred to as P waves, and secondary waves are called S waves. P waves and S waves move past Earth's crust, whi... More »

The surface directly above where an earthquake starts is called the epicenter, according to the United States Geological Survey. The location of the earthquake's origin is the fault or fault plane, and that is the place ... More »