Earthquakes are usually triggered when rock located beneath the ground, on top of fault lines, breaks and suddenly releases a significant amount of energy. The immediate and rapid release of energy caused by earthquakes ... More » Science Earth Science Earthquakes

Earthquakes occur when two blocks of earth suddenly slip past each other. This sudden release of energy causes the seismic waves that make the ground shake. The surface where they slip is known as the fault or fault plan... More »

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 » Science Earth Science Earthquakes

"Seismic activity" is defined as the vibration of the ground due to the release of elastic energy from the breakage of rock within the earth or an explosion. The phenomenon is commonly referred to as an earthquake, but w... More »

Most earthquakes occur along the boundaries between the Earth's tectonic plates. The crust of the Earth is divided into plates. When a plate collides with or slides past another plate, this causes earthquakes. For exampl... More »

While earthquakes can occur almost anywhere, they are most common around the edges of the great tectonic plates of the Earth's crust. The plates are always in motion, and the edges tend to rub up against one another, bui... More »

Roughly three quarters of the world's seismic energy is released in the form of earthquakes along the Pacific Ocean where it meets the western coasts of North, Central and South America. This seismic activity also reache... More »