Seismic Waves & Refraction Overview GEOS 322 Spring 2009.

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Presentation transcript:

Seismic Waves & Refraction Overview GEOS 322 Spring 2009

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

P-Wave Particle Motion

S-Wave Particle Motion

Rayleigh-Wave Particle Motion

Love-Wave Particle Motion

On to refraction Sources include a power point presentation from IRIS – arth_structure_is_determined arth_structure_is_determined –

The first head wave is a reflected wave at the critical angle i c

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

Time Distance Direct wave: Slope is 1/v 1 The cross-over distance, x cross, is related to the depth to the boundary! Head wave: Slope is 1/v 2 x cross

Refraction Movie

Model from movie

Direct Wave Reflected Wave

Chapter 4 Quiz A A C C B B

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