Crust - Earth's outer most layer of solid rock. Between 7 to 70 kilometers thick. Two types of crust exist: oceanic crust and continental crust.
Earthquake - a trembling or shaking movement of the earth's surface that is volcanic or tectonic in origin.
Fault - a fracture in the Earth's crust accompanied by a displacement of one side of the fracture.
Focus or Hypocenter - point of stress release in an earthquake
Geology - science of the earth's history, composition, and structure, and the associated processes.
Geyser - hot spring from which water and steam are ejected periodically to heights ranging from a few to several hundred feet.
Landslide is rapid slipping of a mass of earth or rock from a higher elevation to a lower level under the influence of gravity and water lubrication.<\p>
Mantle - layer of the Earth's interior composed of mostly solid rock that extends from the base of crust to a depth of about 2,900 kilometers.
Rock - aggregation of solid matter composed of one or more of the minerals forming the earth's crust. Rocks are commonly divided, according to their origin, into three major classes—igneous, sedimentary, and metamorphic.
Seismic waves - fluctuation of ground during an earthquake.
Seismology - scientific study of earthquakes and related phenomena, including the propagation of waves and shocks on or within the earth by natural or artificially generated seismic signals.
Tsunami is a series of catastrophic ocean waves generated by submarine movements, which may be caused by earthquakes, volcanic eruptions, landslides beneath the ocean, or an asteroid striking the earth.