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The map below locates earthquakes around the globe. They are not evenly distributed; the boundaries between the plates grind against each other, producing most earthquakes. So the lines of earthquakes help define the plates: (from the USGS)
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www.seismo.unr.edu/ftp/pub/louie/class/100/plate-tecton...
www.seismo.unr.edu/ftp/pub/louie/class/100/plate-tectonics.html
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Visit the Earthquake Museum for everything you want to know about Earthquakes. What Causes quakes? ... The government analyzes the shock waves (earthquakes) produced by nuclear explosions to study the effects of nuclear tests and to monitor tests elsewhere in the world.
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www.olympus.net/personal/gofamily/quake/causes.html
www.olympus.net/personal/gofamily/quake/causes.html
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Earthquakes shake our world every 11 seconds. Find out what causes earthquakes, how fault lines work and learn how earthquakes are monitored. ... In this article, we'll find out what causes earthquakes, and we'll also find out why they can have such a devastating effect on us.
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www.howstuffworks.com/earthquake.htm
www.howstuffworks.com/earthquake.htm
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Next section-- Previous section-- Table of Contents-- Pacific Northwest Earthquakes; ... WHAT CAUSES EARTHQUAKES?; taken from "Washington State Earthquake Hazards", by Linda Noson, Anthony Q amar, and Gerald Thorsen; ... Earthquakes occur only in the outer, brittle portions of these plates, where temperatures in the rock...
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www.geophys.washington.edu/SEIS/PNSN/INFO_GENERAL/NQT/w...
www.geophys.washington.edu/SEIS/PNSN/INFO_GENERAL/NQT/what_causes.html
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Earthquakes release stress which causes permanent change in the Earth's crust. ... What are earthquakes? Types of earthquakes Forces What causes stress? Elasticity Waves Detection and recording Measurement A new type of measurement;
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scign.jpl.nasa.gov/learn/eq.htm
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