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Geohazards.

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Presentation on theme: "Geohazards."— Presentation transcript:

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 Tsunami Sinkhole 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

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6 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

7 Volcanoes Volcanoes release dust and ash which can alter the climate by blocking out the sun As well they can trigger mudslides and send lava down a mountainside

8 volcanoes This contour map represents a volcano
The lava and ash flow would have to flow North due to the sharp drop in elevation on the Northward side

9 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 kilometers per hour

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11 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

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

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

14 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

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

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

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