Notes 10-8-09

Notes 10-8-09 - Snells Law Mode conversion 1.3 SV/SH Mode...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
GEOL 240Lxg Notes 10-8-09 Samoa Earthquake –subduction zone, magnitude 8.0, tension, normal fault, big tsunami , 10 km deep 1.1 Body waves o P waves (compressional waves): Travel at speeds of 6-8 km/s through the earth’s interior. Particle motion is parallel to direction of propagation. Also called primary waves (thus the P). similar to sound waves. o S waves (shear waves) Travel at speeds of 3-5 km/s through the earth’s interior. Particle motion is perpendicular to direction of propagation. Also called secondary waves (thus the S). Do not pass through liquids. Surface waves – Travel at speeds less than 3-4 km/s. They consist of dispersed wave trains (different frequencies travel at different velocities) that travel around the earth at its surface. o Rayleigh waves Particle motion is horizontal and perpendicular to the direction of propagation.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
o Love waves Particle motion is retrograde elliptical in direction of propagation.
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
Background image of page 5
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Snells Law Mode conversion 1.3 SV/SH Mode conversion 1.4 P/SV No mode conversion 1.5 SH Total Internal Reflection 1.6 o Example with light Fish tank o Example with air On a road o Example with water In a pool Earth with increasing P-wave and s-wave Structure of the Crust and Upper Mantle Only known the structure of the earth since the 1920s Earth has a layered structure (onion) base on composition 3 main layers o Crust Moho o Mantle o Core Crust o Continental Crust Lower density, quartz SiO2, feldspars, basalt, variable thickness (10-50 km) o Oceanic crust Higher density, basalt, constant thickness (about 10km) The crust (isostacy) floats on the denser mantle (ultra mafic minerals Olivine ( Mg , Fe ) 2 Si O 4 , Pylaxene (Mg,Fe)SiO 3 ) below...
View Full Document

This note was uploaded on 10/18/2009 for the course GEOL 240Lxg at USC.

Page1 / 5

Notes 10-8-09 - Snells Law Mode conversion 1.3 SV/SH Mode...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online