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Geohazards

Geohazards. Geohazard. A geohazard is a geologic event that has the potential to both destroy property and cause a loss of life Landslide Earthquake Volcano Tsunami Sinkhole Groundwater pollution Flooding. landslides.

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Geohazards

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  1. Geohazards

  2. Geohazard • A geohazard is a geologic event that has the potential to both destroy property and cause a loss of life • Landslide • Earthquake • Volcano • Tsunami • Sinkhole • Groundwater pollution • Flooding

  3. landslides • A landslide is where debris separates from bedrock and the material slides rapidly down slope • Caused by: • Over steepened slope • Removal of vegetation • Earthquakes

  4. landslides • Ways to avoid landslide damage • Don’t build homes on areas of weak soil • Replant trees • Slopes can be sprayed with concrete to reduce rock slipage

  5. Earthquakes • Earthquakes occur when tectonic plates slide past each other, slip and release seismic waves • Ways to mitigate earthquake damage: • Secure bookshelves in home • Secure gas/water heater

  6. Volcanoes • Volcanoes release dust and ash which can alter the climate by blocking out the sun (pyroclastic cloud) • As well they can trigger mudslides and send lava down a mountainside

  7. Tsunamis • A tsunami is a large tidal wave that is generated by seismic waves released from an earthquake • Slab of crust is displaced along a fault • Can travel up to 500-950 kilometers per hour

  8. tsunamis • Ways to mitigate tsunami damage: • Preserve dunes on beaches  Provide inland protection from tsunamis • Build trenches to divert water • Build seawalls to protect inland areas

  9. sinkholes • A sinkhole is a natural depression on the Earth’s surface • Can be caused by collapse of underlying rock

  10. sinkholes • Mitigation: • Use filters  Pump out water which dissolve underlying rock • Careful inspection of bedrock

  11. Groundwater Pollution • Groundwater-Water stored beneath the surface • Becomes polluted when chemical seep into the ground and contaminate the aquifer • This can contaminate wells and a communities drinking water

  12. Flooding • Flooding occurs over an area where water cannot seep into the soil • Soil is impermeable or saturated

  13. Flooding • Mitigation: • Flood risk maps • Don’t build homes on flood plains • Redirecting waters through flood channels

  14. Warm up Wednesday September 11th • 1. Soil is mainly formed by what two processes? • 2. Which layer of a soil profile contain the most humus.? • 3. What factor has the most influence on the development of soil?

  15. Warm upThursday September 12th • Open science notebook to show me “Rock Cycle” vocabulary • Prepare for Vocabulary Quiz • Finish Geohazards foldable • Finish Unit 1 test study guide

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