Physics Project Earthquake Report Earthquakes are vibrations produced in the earth's outer layer, or crust, when forces pushing on a mass of rock overcome the friction holding the rock in place and blocks of rock slip against each other. The vibrations can range from barely noticeable to very destructive. There are 6 types of shock waves. Two are classified as body waves which means they travel through the earth's interior and the other four are surface waves. The waves are changed by the rock types or formations they hit. Primary or compressional waves which are referred to as "P waves" send particles moving back and forth in the same direction as the waves are traveling, secondary or transverse shear waves which are known as "S waves" send vibrations perpendicular to their direction of travel. P waves always travel at higher velocities than S waves. Three general classes of earthquakes are now recognized as tectonic, volcanic, and artificially produced. The tectonic variety is by far the most destructive. The most common cause of tectonic quakes are stresses by movements of the dozen of major and minor plates that make up the earth's crust . Most tectonic quakes occur at the boundaries of these plates, in zones where one plate slides past another Subduction-zone quakes account for nearly half of the world's destructive seismic events and 75% of the earth's seismic energy. They are along the Ring of Fire, a narrow band coincides with the sides of the Pacific Ocean. The points at which crustal rupture occurs in such quakes tend to be far below the earth's surface, at depths of up to 645 km. Not all subduction zones are subject to frequent earthquakes. The frequency and magnitude of earthquakes around subduction zones are related to the direction in which the plates are moving. If two plates moving in the