Earthquakedefinitions - Earthquakes Aftershocks Earthquakes...

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Earthquakes 1/28/2013 Aftershocks- Earthquakes that are weaker than the principal tremor. Body waves- (P and S Waves), travel through the interior of the earth. Creep-(aseismic slip) fault displacement without significant earthquake activity. Dip-slip fault- A fault in which the displacement is vertical, up or down, in the direction of dip. Earthquake- A period of stress buildup,sudden fault rupture in a major earthquake, followed by a brief interval of aftershocks reflecting minor lithospheric adjustments, then another extended period of stress buildup. elastic rebound- The behavior in which rocks snap back elastically to their previous dimensions. epicenter- Point on the earth’s surface directly above the focus. fault-planar breaks in rock along which there is displacement of one side relative to the other, focus- Point on earth’s surface directly above the focus. intensity- the measure of the earthquake’s effects on humans and on surface features.
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Unformatted text preview: liquefaction- When wet soil is shaken by an earthquake and soil particles is jarred apart, allowing water to seep in between them. magnitude- Amount of ground motion. precursor phenomena- Events that occur or rock properties that change prior to an earthquake. P-waves- Compressional waves that travel through matter, the matter is alternately compressed and expanded. seismic gap- Dormant sections of otherwise active fault zones. seismic waves- Stored-up energy that travel away from the focus during an earthquake. seismograph- A machine that detects seismic body waves. strike-slip fault- A strike-slip fault in which the displacement is parallel to the strike (horizontal/ transform ). surface waves - Stored-up energy released during an earthquake. s-waves- Shear waves involving a side-to-side motion of molecules. thrust fault-Reverse faults with relatively shallow dipping fault planes ( Convergent ) tsunami-Seismic sea waves....
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  • Fall '11
  • FITZGERALD
  • Earthquakes, body waves, buildup,sudden fault rupture, significant earthquake activity, shallow dipping fault

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