The S wave is the most destructive wave that causes earthquakes. S waves are more dangerous because they are larger than other wave types and produce both horizontal and vertical motion on and under the ground. More »

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Surface waves cause the most damage to things like highways, bridges and buildings. Surface waves are one of four types of seismic waves generated during an earthquake. More »

The movement of tectonic plates causes earthquakes when two plates that are in contact with each other move in opposite directions and release built-up stress. For example, one plate may move north, while the other may m... More »

Three major events take place at plate boundaries: the formation of volcanoes and mountains, and a greater occurrence of earthquakes. There are also three main types of plate boundaries: divergent, convergent and transfo... More »

Without plate tectonics, there would be no mountains, earthquakes, volcanoes, tsunamis or continental drift. If the Earth did not move, there may not be any continents at all. More »

When tectonic plates collide and form a convergent boundary, their interaction can produce earthquakes, volcanic activity, underwater trenches and mountain formations. Any resulting geologic events on the Earth's surface... More »

Tectonic hazards are geological results of plate shifting exhibited by volcanic eruption, glacial erosion, tsunamis and earthquakes. Earthquakes are the most commonly reported hazards because of the greater likelihood of... More »