Part 1. Watch the video that’s on Canvas and answer the following questions.
1. March 22, 2014 near the town of Oso, Washington, many homes were covered by a squaremile of mud 15 to ___________________ feet deep. 2. Landslides occur commonly all over the earth. In one 7 month period there were 222 largelandslides worldwide that killed nearly __________________.
3. The raw slope left behind after a landslide is called a _____________________________.
4. A technique using laser-based altimetry or _____________________ can see old landslidescars. This technique shows that in the area of Oso there have been many large landslidesin the past. This area is truly unstable.5. 5. The old slides can be dated by ___________________ analysis using pieces of woodburied by slide. A large slide was dated at 5300 years ago. Since 1933 aerial and satellitephotos show that the recent slide had slid many time before 2014. 6. _____________________________ helped searchers refocus the search downslope fromwhere the houses were to where they were carried which is called the distal end of thelandslide.7. What was surprising is the 600 foot slope slid for nearly a ____________________, manytimes further than this slope had slid before at least in recent times.8. Studies indicate that the slide can quickly trigger a second often larger slide as happen inOso, and a few weeks later this same double slide occurred in________________________________ where many rescuers were killed. 9. The lower layer of the Oso slide is composed of __________________________ lake materialthat is a mixture of silt and clay. Above that was glacial ____________________ which wasmore cohesive and slid as blocks. The Oso area had the wettest march in history, nearly 2feet of rain. 10. The ground at Oso underwent liquefaction which is usually associated with_______________________________., but it known that this can happen during slides,especially if there is a lot of _________________________ in slope materia11. The young lady, name Summer, that was trapped in her car on the highway was found 5days after the slide. She hadnʼt suffocated but had died of percussion trauma due to___________________ waves hitting her car. 12. In the space below, write a paragraph describing what you found most interesting from thevideo
13. I hypothesize that
14. Why do you think the Western part of Colorado has greater susceptibility tolandslides than the Eastern portion? 15. Why do you think the Eastern part of Tennessee has greater susceptibility tolandslides than the Western portion?
16. What states have the greatest proportion of lands with a high incident of landsliding?
17. Which portions of California are mostat risk for landslides? Why?Part 3. Landslides in Your Neighborhood. Click on the USGS Landslide InventoryDatabase map and see which landslides are near your own home. Click here —>https://maps.conservation.ca.gov/cgs/lsi/ 18.Type the address to your home into the search bar. Are there any landslides withininitial map field of view? If so, how many? If no, zoom out and estimate how far awaythe nearest landslide is to your home.19.Click on one of the landslides on the map and provide the information that the USGShas about this landslide. 20.Describe the topography (what the lay of the land looks like) of your neighborhood?Does it fit with what you know about topography and landslides? TOCESTEN
Next, let’s look at California’s potential
for landslides (map to the right).
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GOOOD POOD
17. Which portions of California are most
at risk for landslides? Why?
LANDSLIDE
SUSCEPTIBILITY
CLASSES
%20Landslide.pdf
Part 2. Mass-wasting events come in many shapes, sizes and speeds. Typically, the
steeper the angle of a slope, the faster will be the down-slope movement of rock and
sediment. Also, water can play a significant role in mass wasting, sometimes acting as
the key component to a mass-wasting event, or serving as a lubricant within a mass of
sediment and rock, enabling it to travel faster and further than it would otherwise. It is
important to understand that one type of mass wasting can evolve into another type of
mass wasting as the body of sediment/rock moves down a slope. This can make it
difficult to classify a single event as being one type of mass wasting or another.
(Modeled after a lab by Dr. Carol Harden; University of Tennessee).
United Stas Teutate of the
Canbey
LAS SLIDE ONO
5E
The map of landslide areas in the contiguous United States was produced in color and
distributed by the U.S. Geological Survey (http://pubs.usgs.gov/pp/p1183/
plate1.html). According to this map (on page 4), some states have no landslides, while
others have considerable landslide activity. Looking at the map, hypothesize the type of
terrane and the type of environment that is most susceptible to land-sliding.