Earthquakes http://environment.nationalgeographic.com/environment/photos/earthquake-general/1.

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Presentation transcript:

Earthquakes http://environment.nationalgeographic.com/environment/photos/earthquake-general/1

San Andreas Fault The 800-mile (1,300-kilometer) fault runs through western and southern California, dividing the Pacific and North American plates

Compression Waves aka P-Waves Fastest Waves – arrive first (primary waves) Push – Pull rocks in the same direction as the wave travels Travel through solids and liquids (Travels through entire earth Theoretical p-waves travel times http://neic.usgs.gov/neis/eq_depot/2008/eq_080512_ryan/neic_ryan_t.html

Shear waves aka S-waves or Secondary Waves Body waves characterized by a series of sidewise or shearing movements causes particles to move at right angles to wave direction Slower than P-waves Can travel through solid material only

http://sunshine.chpc.utah.edu/labs/seismic/seismic.swf Animation of p-waves and s-waves

Surface Waves Love waves (L-Waves) Rayleigh Waves Move in two directions as they pass through the surface Up and Down as well as Side to Side CAUSE THE MOST DAMAGE TO BUILDINGS

3-D Models http://www.forgefx.com/casestudies/prenticehall/ph/seismic/seismicRT.htm

Seismograph or Seismometer instrument that records the intensity and duration of earthquakes and similar tremors

Seismogram The record produced by a seismometer