... in 1906, killing 700. Types of Earthquakes All earthquakes may be classified as one of three types, tectonic, volcanic or artificial (human inflicted). Tectonic Tectonic earthquakes are caused by movements of the plates which make up the crust of the earth. These earthquakes usually occur at the boundaries of the plates, where they slide against one another causing a buildup of friction and pressure until a sudden rush of energy results in an earthquake. Of the three types, tectonic earthquakes are the most devastating and must account for about half of the world's destructive earthquakes. Human Inflicted Sometimes, earthquakes occur as a result of human actions such as when atomic explosives are detonated underground or when new reservoirs are filled. These artificial earthquakes are rare and relatively harmless when compared with the sheer destructive power of earthquakes caused by nature. Effects of Earthquakes The most common damage and the greater amount of injuries caused by earthquakes is a ...

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