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The shaking of Earth's crust by a sudden release of energy. |
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Elastic Rebound Theory [image] |
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The theory that earthquakes occur when the stress building up between two lithospheric plates evercomes the force of friction, causing the plates to suddenly move, release energy, and then snap back to their former shapes. |
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Point on Earth's surface directly above the focus of an earthquake. |
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The boundary between Earth's cust and mantle. |
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A numerical description of an earthquake's magnitude. |
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Modified Mercalli Scale [image] |
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Definition
The Mercalli Scale is a scale used for measuring the intensity of an earthquake. |
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Seismic Waves are waves that travel through the Earth or other elastic body, for example as the result of an earthquake, explosion, or some other process that imparts forces to the body. |
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The recording of an earthquake made be a seismogragh; it records the time the earthquake takes place and teh type and strength of earthquake waves. |
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An instument that detects and records earthquake waves. |
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A wide area around Earth on the side opposite the focus of an earthquake where neither P nor S waves are received. |
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A graph that shows the relationship between P and S wave travel times and epicenter distance. |
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Primary earthquake waves, that can travel through any material. |
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Secondary, or shear, earthquake waves, which can travel through solids, but not liquids or gases. |
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An earthquake wave that travels along Earth's surface. |
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R-waves move the surface of the earth around in a circle, forward and down then back and up. |
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A gigantic wave that results from an underwater earthquake, or landslide, or volcanic eruption. |
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| Body waves travel through the interior of the Earth. |
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Definition
A surface wave is a mechanical wave that propagates along the interface between differing media, usually two fluids with different densities. |
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