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Earthquakes are usually caused when rock underground suddenly breaks along a fault. This sudden release of energy causes the seismic waves that make the ground shake. When two blocks of rock or two plates are rubbing against each other, they stick a little. ... Back to Where Do Earthquakes Happen? <
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www.geo.mtu.edu/UPSeis/why.html
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Earthquakes occur all the time all over the world, both along plate edges and along faults. ... Most earthquakes occur along the edge of the oceanic and continental plates. The earth's crust (the outer layer of the planet) is made up of several pieces, called plates. The plates under the oceans are called oceanic plates...
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www.geo.mtu.edu/UPSeis/where.html
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Small earthquakes happen with movements of millimeters. On the maps below, each dot marks the locations of a magnitude 4 or larger earthquake. The earthquakes were recorded over a five year time period. Earth’s outer surface in broken into what geologists call plates.
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www.iris.edu/hq/files/publications/brochures_onepagers/...
www.iris.edu/hq/files/publications/brochures_onepagers/doc/no2_lo.pdf
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Why do they happen? ; Although the ground we walk on seems solid, the earth is actually made up of huge pieces of flat rock called tectonic plates. ... This causes tremors and shakes - and this is what causes earthquakes.
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news.bbc.co.uk/cbbcnews/hi/find_out/guides/tech/earthqu...
news.bbc.co.uk/cbbcnews/hi/find_out/guides/tech/earthquakes/newsid_1894000/1894934.stm
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Hurricanes ; The destructive power of hurricanes, typhoons and cyclones ; Tornadoes ; How tornadoes form and the damage they can cause ; Earthquakes ; How and why the Earth moves - and different types of quake ; Volcanoes ; How they are formed and what happens during an eruption ; Tsunamis ; How earthquakes at sea...
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news.bbc.co.uk/2/hi/4126809.stm
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Geologists have found that earthquakes tend to reoccur along faults, which reflect zones of weakness in the Earth's crust. Even if a fault zone has recently experienced an earthquake, however, there is no guarantee that all the stress has been relieved. ... How Earthquakes Happen...
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pubs.usgs.gov/gip/earthq1/how.html
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Earthquakes happen along "fault lines" in the earth’s crust. Earthquakes can be felt over large areas although they usually last less than one minute. Earthquakes cannot be predicted -- although scientists are working on it!
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www.fema.gov/kids/quake.htm
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