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