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