Upload
abel-woods
View
222
Download
0
Tags:
Embed Size (px)
Citation preview
California’s California’s natural natural hazardshazards
Earthquake hazards
tsunamis, seismic shaking, liquefaction, and landslides
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
Seismic shaking
• Amount of shaking depends on the soil, buildings, distance from epicenter and intensity of the quake.
1868 quake on the Hayward fault
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
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 1914-1917
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
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.
Review
1. What is the name of a large wave caused by an earthquake?
2. Name 3 storm hazards.
3. Name 3 things that affect seismic shaking.