Earthquakes cause direct damage when the seismic disturbance weakens and collapses buildings and other infrastructures not built to withstand the tremors. This often causes great loss of life. Other damage caused by eart... More »

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 »

Earthquakes occur when two blocks of Earth's crust slip past each other suddenly. Tectonic plates fit together like pieces of a puzzle and are continually moving. The edges of tectonic plates are rough and sometimes stic... More »

The major dangers of earthquakes include other hazardous effects that could occur after an earthquake subsides, such as liquefaction, tsunamis, further ground tremors and landslides. By being aware of these dangers, in t... More »

Most earthquakes in California cause little, if any, damage, but exceptions exist. As of February 2015, the most damaging earthquake in California is the Great San Francisco Earthquake of 1906. At a 7.8 magnitude, it lev... More » Science Earth Science Earthquakes

Seismic activity is described by geologists as an elastic wave traveling through the Earth following an earthquake or other geological disturbance. Seismic activity encompasses the frequency, size and type of earthquake,... 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 »