Travels only through solids pandswaves


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Unformatted text preview: ry (P) waves Push-pull motion Travel thru solids, liquids & gases – Secondary (S) waves Moves at right angles to their Moves direction of travel direction Travels only through solids P and S waves Smaller amplitude than surface (L) waves, but faster, P arrives first Locating the source of Locating the source of earthquakes Focus - the place within Earth where earthquake waves originate earthquake Epicenter – location on the surface directly above the focus above Epicenter is located using the difference in Epicenter velocities of P and S waves velocities Earthquake focus and epicenter Delay between P and S arrivals gives distance to epicenter Note how much bigger the surface waves are Body Waves Graph to find distance to epicenter Graph to find distance to epicenter Locating the epicenter of an earthquake Locating Three seismographs needed to locate an Three epicenter epicenter Each station determines the time interval Each between the arrival of the first P wave and the first S wave at their location the A travel-time graph then determines each travel-time station’s distance to the epicenter station’s Locating Earthquake Epicenter Locating the epicenter of an earthquake A circle with radius equal to distance to circle the epicenter is drawn around each station station The point where all three circles The intersect is the earthquake epicenter intersect Epicenter located using three seismographs Epicenter l...
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This document was uploaded on 01/26/2014.

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