Tutorial 6
docx
keyboard_arrow_up
School
Simon Fraser University *
*We aren’t endorsed by this school
Course
312
Subject
Geology
Date
Dec 6, 2023
Type
docx
Pages
2
Uploaded by anniesun9876
What were the causes and trigger of the 2014 Oso slide?
The stratigraphy-the complex layers of materials in the ground. The oldest
sediments at the bottom are pre-glacial sediments that are about 35,000 years
old. As the glaciers began to come down, it began to dam the North Fork
Stillaguamish river and left behind lake sediments at the bottom. Sand was left
behind in front of glaciers until glaciers melting washed more sand and gravel on
top. This weak pile of sediments was bound to create a landslide anytime,
however, the main trigger was the large amount of rainfall in March 2014.
Question 2:
Risk is determined by both the probability of a hazard and the vulnerability to that
hazard when it occurs. In what ways did humans affect the probability of the Oso
landslide hazard? In what ways did human activity change vulnerability to the slide?
Human activity such as population growth the 1990’s-2014 was a factor in increasing
the probability of the Oso landslide. Population growth involves logging, clearcutting,
urban development, which changes the state of the land. Another human effect was
the inaccuracy or failure in recording historical landslides that enabled construction in
hazardous zones that would increase future landslide risks. One way human activity
changed vulnerability to the slide was by attempting mitigation.
Question 3:
In what ways do you think the Oso landslide may have been preventable or risk
reduced? Are these methods practical for the mitigation of future slope failures in the
Stillaguamish River valley near Oso?
One method in preventing or reducing risks of the Oslo landslide is
by implementing
strict land use planning and zoning regulations that restrict development in high-risk
landslide areas. This can help prevent construction in vulnerable locations. Another
method is mapping geological hazards to identify areas prone to landslides and make
this information readily available to landowners and people living nearby. Lastly, develop
and regularly update emergency response plans, ensuring that both authorities and
residents are well-prepared to respond to landslide events.
Question 4:
Would the costs of buying out the property owners in the year 2000 and forcing them
to leave, outweigh the costs of the landslide itself? Explain. What other problems might
exist with this strategy of mitigation?
The total cost of buying out property owners would be $1,656,000. This cost alone
would not outweigh the costs of the landslide itself, however, additional unexpected
fees can accumulate to outweigh the costs. For example, this strategy has both ethical
and legal risks in forcing to evacuate homeowners and long term land and
infrastructure management fees are unpredictable. In comparison, a landslide alone
may cost less if these long-term fees are accounted for.
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help