Earthquake Hazards. Hazards are produced from the response of energy released Amount and duration are related to the amount of energy released.

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Presentation transcript:

Earthquake Hazards

Hazards are produced from the response of energy released Amount and duration are related to the amount of energy released

WHICH HAZARDS DO YOU KNOW?

Earthquake Hazards Tsunami: displacement of a large volume of water – Shallow hypocenter, large volume of displaced crust, large earthquake Ground shaking: determined by proximity of epicenter; magnitude of earthquake; and earth materials Ground shaking

GroundGround shakingshaking In general, more intense closer to the epicenter: exceptions Mexico City, miles from epicenter Loma Prieta, miles from epicenter

Seismic wave energy dissipates faster when there are more rock layers. Notice the area in Southern California is smaller than in the New Madrid area. The geology in Southern California is much more complicated.

Seismic waves vary in amplitude and wavelength depending on Earth material Bedrock is more dense- higher frequency, lower amplitudes Soft mud is less dense-lower frequency, higher amplitudes

Liquefaction Magnitude 7.5 or larger Ground turns to slurryslurry Occurs where water meets land Especially unengineered fill

Liquefaction: earth material can no longer support any structures including water lines and pipes

Liquefaction, Japan 1964

Landslide

Massive Landslide, Turnagain Heights

Sand volcanoes occur in association with liquefaction: >M7 Alaska, 2002 Japan,1964

Sand volcano, Loma Prieta earthquake

Geologists infer a large earthquake occurred due to the presence of the sand volcano The timing is determined using carbon 14 dating methods Sand Volcanoes

GroundGround Rupture Landers, Mw 7.3 Hecter Mine, Mw 7.1

Ground Rupture: 1906 earthquake

LandslidesLandslides or mass movement Different types of earth material are stable at different angles Angle of repose: – dry sand versus wet sand

Angle of repose: depends on Earth material and climate Coast Ranges, California Utah Numbers indicate different part of slope but not addressed in this class

Any change in physical properties of the earth material, causes the slope to readjust China, 2009 Landslides or mass movementmovement El Salvador