GEOL 108 - Crises of a PlanetLab 3 - Earthquake Hazards
Sept. 16 - 21, 2012
Department of Earth Sciences
Department of Earth Sciences
REVIEW | 2
QUIZ 1 REVIEW
Department of Earth Sciences
REVIEW | 3
QUIZ 1 REVIEW• Draw and label the following features in a single sketch: Mid-ocean ridge,
trench, subduction zone, oceanic lithosphere, continental lithosphere, mountains/volcanoes. Draw arrows showing direction of plate movement.
http://www.tulane.edu/~sanelson/geol204/eqhazards&risks.htm
Department of Earth Sciences
EARTHQUAKES | 4
LAB 3 - EARTHQUAKES - KEY CONCEPTS
• Understand the effects of shaking on various objects
• Underlying geology changes seismic wave properties
• Liquefaction
Department of Earth Sciences
EARTHQUAKES | 5
SEISMIC WAVES
• Release of accumulated energy leads to quake• Energy travels in waves of vibration
− Body waves• P-waves - primary• S-waves - secondary
− Surface waves• Love• Rayleigh
Department of Earth Sciences
EARTHQUAKES | 6
SEISMIC WAVES
• Damage usually highest from waves of highest amplitude
From the seismogram, which wave is most destructive?
Department of Earth Sciences
EARTHQUAKES | 7
BEDROCK TYPE AND INTENSITY
Video removed for sizehttp://www.youtube.com/watch?v=-bzQM0j3W8c
Department of Earth Sciences
EARTHQUAKES | 8
LIQUEFACTION
• During earthquakes, saturated sediment can flow like a liquid
http://www.tulane.edu/~sanelson/geol204/eqhazards&risks.htm
