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The Earth's crust does not give outward signs of all the movement within it. Rather energy builds up from these movements within its rocks until the tension is more than the rock can bear. At this point the energy is released at the weakest parts of the crust. This causes the ground to move suddenly, unleashing an earthquake. E 1 FORESHOCK 2 Small tremor that can anticipate an earthquake by days or even years. It could be strong enough to move a parked car. New seismic movement that can take place after an earthquake.

But in the open country, where earthquakes have much less effect, we can conclude that it is not earthquakes, but buildings, that kill people. 0 Sumatra, 2004 Tsunami in Asia An earthquake near the island of Sumatra created 33-foot (10-m) waves and a human tragedy. INDOAUSTRALIAN PLATE PACIFIC PLATE PACIFIC PLATE The deepest marine trench on the planet, with a depth of 35,872 feet (10,934 m) below sea level. It is on the western side of the north Pacific and east of the Mariana Islands. AFRICA CENTRAL AMERICA CARIBBEAN PLATE A Caribbean Plate nd e NAZCA PLATE M o u n ta in s NEW ZEALAND FAULT A large fault that moves horizontally, crosses the lithosphere, accommodating the movement between two large crust plates; it is a special type of directional plate called a transforming plate.

A 1960 earthquake off the coast of Chile caused a tsunami that swept away communities along 500 miles (800 km) of the coast of South America. Twenty-two hours later the waves reached the coast of Japan, where they damaged coastal towns. A 33 feet Sea level drops abnormally low. Water is “sucked” away from the coast by the growing wave. (10 m) 25 feet (8 m) (10 m) B Harbor Wave (3 m) The giant wave forms. At its highest, the wave may become nearly vertical. 8 m) C 1 Typical height a major tsunami can reach.

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Britannica Illustrated Science Library Volcanoes And by Inc. Encyclopaedia Britannica
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