Overview
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 square mile of mud 15 to ___________________ feet deep.
2. Landslides occur commonly all over the earth. In one 7 month period there were 222 large landslides 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 landslide scars. This technique shows that in the area of Oso there have been many large landslides in the past. This area is truly unstable. 5.
5. The old slides can be dated by ___________________ analysis using pieces of wood buried by slide. A large slide was dated at 5300 years ago. Since 1933 aerial and satellite photos show that the recent slide had slid many time before 2014.
6. _____________________________ helped searchers refocus the search downslope from where the houses were to where they were carried which is called the distal end of the landslide.
7. What was surprising is the 600 foot slope slid for nearly a ____________________, many times 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 in Oso, 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 material that is a mixture of silt and clay. Above that was glacial ____________________ which was more cohesive and slid as blocks. The Oso area had the wettest march in history, nearly 2 feet 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 materia
11. The young lady, name Summer, that was trapped in her car on the highway was found 5 days 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 the video
13. I hypothesize that
14. Why do you think the Western part of Colorado has greater susceptibility to landslides than the Eastern portion?
15. Why do you think the Eastern part of Tennessee has greater susceptibility to landslides 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 most at risk for landslides? Why?
Part 3. Landslides in Your Neighborhood. Click on the USGS Landslide Inventory Database 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 within initial map field of view? If so, how many? If no, zoom out and estimate how far away the nearest landslide is to your home.
19.Click on one of the landslides on the map and provide the information that the USGS has 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?