g7 - What are Earthquakes? The shaking or trembling caused...

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What are Earthquakes? The shaking or trembling caused by the sudden release of energy Usually associated with faulting or breaking of rocks Continuing adjustment of position results in aftershocks
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What is the Elastic Rebound Theory ? Explains how energy is stored in rocks Rocks bend until the strength of the rock is exceeded Rupture occurs and the rocks quickly rebound to an undeformed shape Energy is released in waves that radiate outward from the fault
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The Focus and Epicenter of an Earthquake The point within Earth where faulting begins is the focus, or hypocenter The point directly above the focus on the surface is the epicenter
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Seismographs record earthquake events At convergent boundaries, focal depth increases along a dipping seismic zone called a Benioff zone
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Where Do Earthquakes Occur and How Often? ~80% of all earthquakes occur in the circum-Pacific belt most of these result from convergent margin activity ~15% occur in the Mediterranean-Asiatic belt remaining 5% occur in the interiors of plates and on spreading ridge centers more than 150,000 quakes strong enough to be felt are recorded each year
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The Economics and Societal Impacts of EQs Damage in Oakland , CA, 1989 Building collapse Fire Tsunami Ground failure
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Response of material to the
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g7 - What are Earthquakes? The shaking or trembling caused...

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