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

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

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