Lecture 4 Notes - Sam Krepps 2.12.08 NOTES I Seismic Waves...

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Sam Krepps 2.12.08 NOTES I. Seismic Waves A. Body Waves: seismic waves that pass through the interior of the Earth 1. P-waves: primary waves i. Pressure or push-pull waves ii. Travel fastest: few kilometers per second a. Arrive at a seismic station first 2. S-waves: secondary waves i. Shear or shake waves ii. Travel slightly more slowly than P-waves a. Arrive second at the seismic station B. Surface Waves: seismic waves that travel along the Earth’s surface 1. Rayleigh wave (R-wave) make the ground surface to ripple up and down. 2. Love wave (L-wave) make the ground surface ripple side-to-side like a snake. 3. Travel more slowly then either P- or S- waves II. Locating an Epicenter A. Need three seismic stations to record event 1. Need to know the difference in arrival times between P- and S-wave i. Further away, larger the gap time. ii. Arrival time: the instant at which an earthquake appears on a seismograph iii. Delay between the P- and S-wave arrival times increases as distance from the epicenter increases 2.
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