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Geology
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The University of Alabama
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Homework
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Oso Infographic Questions
Please read through and examine the photographs in the link to answer the following
questions. Answer the questions on this page and SaveAs_YourLastName to upload to the
submission box on Canvas.
http://projects.seattletimes.com/2014/building-toward-disaster/
1. The first landslide is documented in the interactive graphic in what year?
1887
2. How many landslides had been mentioned in the historical records leading up to this first
documented event?
6
3. What approach did the government use to subdue mass wasting along the slide area in the
1960's?
The government used the "sensitive area" approach, where water can feed the stable
slope.
4. Offer two reasons why their attempt to engineer a solution in the 1960's didn't work:
One of the ways in which trying to design a solution to the problem did not work was the
proposal to buy properties from sliding-sensitive areas and move the river, but the cost would be
too high and "not worth it".
Another proposal was to build a 150-meter-long rock dam on the hill, but because the dike
was not long enough, it covers only a quarter of the active sliding area. In addition, the dam
retains water instead of channeling it.
5. Compare the photos from before and after the 1967 landslide event. What is the dramatic result
to the landscape that occurs as a result of the 1967 slide?
The dramatic result of the landscape following the 1967 landslide was the flooding of
several areas due to the overcharging of the dike, killing several types of vegetation.
6. In what year has the river moved itself back to its position at the time of the 1967 slide?
1987
7. What events lead up to the next major slide, in 1988?
Inside the 1967 scar, a landslide pushes one or two acres of mud and trees into the
Stillaguamish, leading to the large slide.

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8. In the image taken in 1998 the head scarp has shifted. Where is it in relation to the head scarp
from the 1967 slope failure event? (to the north, south, east, west)
Compared to the other years, in the image taken in 1998 the escarpment changed. In 1967,
escarpment is 50 and 60 meters from the creek. Now it is further north.
9. In what year does the failure surface from 1967, and from 1998 appear to be combined into
one, large, massive slope surface with potential for failure?
1999
10. What actions do the government agencies take in light of the increasingly apparent danger in
2006?
County officials inform residents of the landslide.
County officials consider applying for grants from a statewide program to raise or buy
properties in flood-prone areas.
11. The catastrophic 2014 Oso event is illustrated in a photograph. What do you notice about the
placement of the head scarp now? Specifically, what is it location relative to the area that had
been logged in 2009-2011?
Observing the illustration of the 2014 disaster, it is possible to see that the placement of
the escarpment of the head continues to grow to the north. In relation to what had been
recorded in 2009-2011 it is possible to notice that there was a difference of 50 meters.
12. One of the biggest challenges in dealing with or preparing for natural disasters is considering the
cost to every 'stakeholder' that may be affected. Stakeholders include different groups of people
who use the land and its natural resources, as well as endangered animals, agencies, and
businesses. List the 5 primary shareholders that have a stake in what happens along this stretch
of the Stillaguamish River according to the infographic:
State flood control supervisor.
Director of the gaming department.
Hunting department.
Fisheries.
Department of State Ecology.
13. At least 5 different types of mass movement are described in the Red Flags, occurring at this
location over the years. List 4 of them, the year they are documented. Explain how they are
different from one another.
1967: Landslide area gets closer and closer to Headache Creek. Escarpment was 490 feet.
1969: A local state geologist sees a 45-meter escarpment, recently collapsed, and a mud
flow hundreds of feet long.

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Oso Infographic Questions Please read through and examine the photographs in the link to answer the following questions. Answer the questions on this page and SaveAs_YourLastName to upload to the submission box on Canvas. http://projects.seattletimes.com/2014/building-toward-disaster/ 1. The first landslide is documented in the interactive graphic in what year? 1887 2. How many landslides had been mentioned in the historical records leading up to this first documented event? 6 3. What approach did the government use to subdue mass wasting along the slide area in the 1960's? The government used the "sensitive area" approach, where water can feed the stable slope. 4. Offer two reasons why their attempt to engineer a solution in the 1960's didn't work: One of the ways in which trying to design a solution to the problem did not work was the proposal to buy properties from sliding-sensit ...
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