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13A.3 – Natural Hazards

13A.3 – Natural Hazards. Do Now. What are four main earthquake hazards in California?. Do Now. What are four main earthquake hazards in California? Tsunamis Seismic Shaking Liquefaction Landslides. Key Words. Hazard. Vocab Words. Natural Hazard Volcanic Field.

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13A.3 – Natural Hazards

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  1. 13A.3 – Natural Hazards

  2. Do Now • What are four main earthquake hazards in California?

  3. Do Now • What are four main earthquake hazards in California? • Tsunamis • Seismic Shaking • Liquefaction • Landslides

  4. Key Words • Hazard

  5. Vocab Words • Natural Hazard • Volcanic Field

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

  7. California’s Earthquake Hazards Hundreds of earthquakes each day in CA Most are so weak they are generally not felt. Earthquakes can lead to numerous other natural hazards Tsunamis, Seismic Shaking, Liquefaction and Landslides.

  8. 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.

  9. 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.

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

  11. 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.

  12. 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.

  13. 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 plants, animals and people to die. Especially Mammoth Mountain.

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

  15. 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.

  16. 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.

  17. Group Challenge Question • What factors are responsible for most of the floods in California?

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