1. California’s natural hazards

2. Earthquake hazards
tsunamis, seismic shaking, liquefaction, and landslides

3. tsunamis
Form when the ocean floor shifts in an earthquake or undersea landslide.
The wave travels 600mph
Coastal warning systems are in place.
If you see the water go out…RUN!
Crescent City, 1964 after Alaska earthquake

4. Seismic shaking
Amount of shaking depends on the soil, buildings, distance from epicenter and intensity of the quake.
1868 quake on the Hayward fault

5. Other EQ hazards Liquifaction: water-soaked soil turns into a liquid.
Landslides: on steep slopes, rocks and dirt come loose.
Other causes:
Excess rain
After fires
After drought
Anchorage, Alaska 1964

6. Volcanic hazards Include volcanic ash, lava flows, and volcanic gases.
Volcanic fields can become active again.
Toxic CO2 from Mammoth Mtn. is killing the forest in this volcanic area east of the Sierras.
Mt. Lassen

7. Storm hazards
Mudflows: a mass of very wet soil flows downhill – can move 60 km/hr.
Flooding: too much rain or melting snow.
Failing levees in rivers and deltas
Flash floods in deserts

8. Be prepared for an earthquake
Getting together an EQ safety kit.
Preparing your home for an earthquake
Know how to turn off the gas supply.

9. Review What is the name of a large wave caused by an earthquake?
Name 3 storm hazards.
Name 3 things that affect seismic shaking.