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– Natural Hazards

– Natural Hazards. Warm Up. What is a natural hazard? What are natural hazards that result from earthquakes?. What is a Natural Hazard ?. An event that results from Earth processes and that can cause damage and endanger human life.

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– Natural Hazards

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  1. – Natural Hazards

  2. Warm Up • What is a natural hazard? • What are natural hazards that result from earthquakes?

  3. What is a Natural Hazard? An event that results from Earth processes and that can cause damage and endanger human life. Earthquakes Hazards: Seismic shaking landslides, tsunamis, liquefaction Other types of Hazards in CA: volcanoes, mudflows and flooding Hazards in other locations: Tornadoes, hurricanes, etc. in other states

  4. California’s Earthquake Hazards Hundreds of earthquakes each day in CA http://earthquake.usgs.gov/earthquakes/map/ Earthquakes can lead to numerous other natural hazards Tsunamis, Seismic Shaking, Liquefaction and Landslides.

  5. Tsunamis • http://www.youtube.com/watch?v=j9JDzBTwiig&list=PLCD62497630B1A8A2&safe=active • Along a Subduction • Zone, the Fault • breaks, Causing • the Ocean to Push • up, creating a damaging wave

  6. Tsunamis In the past 200 years, more than a dozen locally generated tsunamis have struck the CA coastline. Not all are locally such as when a major earthquake in Alaska in 1964 produced a tsunami that struck Crescent City hours later and killed 11 people.

  7. How do we prepare for a Tsunami: • What are some ways we can prepare for a Tsunami? • Do we have a warning system in place? • http://wcatwc.arh.noaa.gov/

  8. Is there a Warning: • Hawaiian Tsunami Warning Center

  9. Are earthquakes always bad? What causes it be a hazard? • http://www.youtube.com/watch?v=CtBXTvtFaCU&list=PLCD62497630B1A8A2&safe=active • Seismic Shaking: • Plates have their motion blocked, stress builds up until an earthquake happens, the seismic waves rolling causes shaking.

  10. What makes seismic shaking a hazard? • Write down your answers in that part of your paper.

  11. Seismic Shaking The amount of shaking from one location to another varies. The further from the epicenter the less shaking that will occur. Rock and soil conditions also play a part.

  12. Liquefaction Definition • A process by which water-saturated sediment temporarily loses strength and acts as a fluid, like when you wiggle your toes in the wet sand near the water at the beach. This effect can be caused by earthquake shaking.

  13. Demonstration of Liquefaction • Watch the demonstration: Write down notes of what you see • Which type of material would be best to build on? • What will happen in some areas as the population builds up? • http://www.youtube.com/watch?v=Rd6W2aP2dkA&safe=active

  14. Warm Up • What is a landslide? • What is liquefaction? • Where would a tsunami most likely start?

  15. Liquefaction Liquefaction occurs when water-soaked soil turns to a thick, soupy liquid during an earthquake.

  16. Landslides When loose rock and soil on a slope moves resulting from an earthquake. Mostly on steep slopes More likely after fires or droughts since plants are damaged and they typically hold the soil in place.

  17. Earthquake Hazards in California • http://www.youtube.com/watch?v=Rd6W2aP2dkA&safe=active

  18. California's Volcanic Hazards Natural hazards that result from volcanic activity are volcanic ash, lava flows and volcanic gases. The Cascade Range runs through CA, in northern CA. Most are dormant but can still erupt at any given time. All composite cones and has the potential to cause volcanic ash and lava flows.

  19. Plate Boundary

  20. Volcanoes in California • http://www.nationalatlas.gov/dynamic/dyn_vol-ca.html

  21. Lassen Peak, Mt Shasta from the Cascade Range Volcanoes

  22. California's Volcanic Hazards Volcanic Field: An area that is covered by volcanic rocks. Eastern and central parts of CA. Long Valley Caldera is an example of a volcanic field. High concentrations of Carbon Dioxide gases are currently leaking in this area; causing vegetation to die. Especially Mammoth Mountain.

  23. California's Storm Hazards Two main storm-related hazards in California are mudflows and flooding. The dry conditions in southern California make it very susceptible to mudflows and flooding, especially when precipitation is greater than normal.

  24. Mudflows Masses of very wet soil, and sometimes rock, that flows quickly downhill. These are common in southern CA during and after severe rainfall. Usually on a steep slope.

  25. Floods are the stage at which rivers or dams over flow. It causes a sufficient magnitude of water to cause considerable flooding of land and roads and/or threat of significant hazard to life and property Flooding

  26. Flooding There are flash floods in areas that have been in droughts. Flooding, especially flash flooding is extremely dangerous because the water rises and moves rapidly.

  27. California levees are in critical condition and need repair Floods

  28. Ticket Out: • Name the different hazards • What good things do earthquakes show is going on in the planet? • What causes so much damage from earthquakes? (Or creates so many hazards?) • What natural hazard would most concern us in Yuba City

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