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Seismic Waves & Refraction Overview

Seismic Waves & Refraction Overview. GEOS 322 Spring 2009. Outline. Seismic Wave Particle Motion Examples Refraction Basics Discuss the last quiz. P-Wave Particle Motion. http://web.ics.purdue.edu/~braile/edumod/waves/WaveDemo.htm. S-Wave Particle Motion.

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Seismic Waves & Refraction Overview

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  1. Seismic Waves & Refraction Overview GEOS 322 Spring 2009

  2. Outline • Seismic Wave Particle Motion Examples • Refraction Basics • Discuss the last quiz

  3. P-Wave Particle Motion http://web.ics.purdue.edu/~braile/edumod/waves/WaveDemo.htm

  4. S-Wave Particle Motion http://web.ics.purdue.edu/~braile/edumod/waves/WaveDemo.htm

  5. Rayleigh-Wave Particle Motion http://web.ics.purdue.edu/~braile/edumod/waves/WaveDemo.htm

  6. Love-Wave Particle Motion http://web.ics.purdue.edu/~braile/edumod/waves/WaveDemo.htm

  7. On to refraction • Sources include a power point presentation from IRIS • http://www.iris.edu/hq/resource/how_shallow_earth_structure_is_determined • http://web.utah.edu/thorne/animations.html

  8. The first head wave is a reflected wave at the critical angle ic ic

  9. ic ic The Head wave moves along the surface at the SPEED OF THE LOWER LAYER!!!

  10. Distance xcross Direct wave: Slope is 1/v1 Time Head wave: Slope is 1/v2 The cross-over distance, xcross , is related to the depth to the boundary!

  11. Refraction Movie

  12. Model from movie

  13. Direct Wave Reflected Wave

  14. Chapter 4 Quiz A C B

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