Earthquake Hazards.

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Presentation transcript:

Earthquake Hazards

A. Some Earthquake Hazards Earthquakes and Society A. Some Earthquake Hazards Structural Failure Land and Soil Failure Fault scarps (the earth opens up!) Tsunamis- NOT tidal events

Structural Failure The damage produced by an earthquake is directly related to the strength or quality of the structures involved. The most severe damage occurs to unreinforced buildings made of stone, concrete, or other brittle building materials. Wooden structures and many modern high-rise, steel-frame buildings sustain little damage during an earthquake.

Earthquakes may trigger massive landslides in sloping areas. Earthquakes and Society Land and Soil Failure Earthquakes may trigger massive landslides in sloping areas. In areas with sandy soil, earthquakes may cause subsurface materials to shake so much they liquefy and behave like quicksand. Wave size and earthquake intensity are amplified in soft, unconsolidated sediments and are dampened in hard, resistant rocks such as granite.

Fault movements associated with earthquakes can produce fault scarps. Earthquakes and Society Fault Scarps Fault movements associated with earthquakes can produce fault scarps. Fault scarps are cliffs that form where the fault meet the ground surface.

Earthquakes and Society Tsunami A tsunami is a large ocean wave generated by vertical motions of the seafloor during an earthquake. These motions displace the entire column of water overlying the fault, creating bulges and depressions in the water. The disturbance spreads out from the epicenter in the form of extremely long waves that can travel at speeds of between 500 and 800 km/h When the waves enter shallow water they may form huge breakers with heights occasionally exceeding 30 m.

B. Seismic Risk West Coast, Alaska & Hawaii New Madrid Zone Earthquakes and Society B. Seismic Risk West Coast, Alaska & Hawaii New Madrid Zone

Earthquakes and Society

C. Earthquake Prediction Earthquakes and Society C. Earthquake Prediction 1.The probability of an earthquake’s occurring is based on two factors: The history of earthquakes in an area The rate at which strain builds up in the rocks 2. Seismic Gap -sections of active faults that haven’t had earthquakes for a long period of time.