Investigation16

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Coconino Community College *

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110

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Geography

Date

Apr 29, 2024

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docx

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4

Uploaded by EarlWildcat346

GLG 110 Natural Disasters Name: __________________________ Investigation 16 Living with Mass Movements Instructions: Use the links provided to answer the questions. 1. Take a look at these photos of a mass movement that damaged US 89 between Flagstaff and Page in 2013: https://www.flickr.com/photos/arizonadot/sets/72157632823622216/with/ 8519427830/ Explain why it wouldn’t be easy to stabilize this stretch of road (compared to some of the simpler techniques we saw in class). 2. Read this short post: http://arizonageology.blogspot.com/2013/02/us89-slide-may-be-failure-in- larger.html Why could you say the 2013 mass movement was unsurprising? 3. Read about ADOT’s repair project, which took over 2 years to complete so the road could be reopened. This early post contains a helpful diagram: https://azdot.gov/adot-blog/adot-identifies-long-term-us-89-repair-solution And this later post has a clearer description: https://azdot.gov/adot-blog/us-89-landslide-repairs-begin-later-month What did they do?
4. The steep walls of Oak Creek Canyon along Hwy 89 between Flagstaff and Sedona mean the risk of mass movements is significant. Let’s take a look. a. What can you see here? https://www.google.com/maps/@35.028447,- 111.7418844,3a,75y,67.76h,104.3t/data=!3m6!1e1!3m4! 1sGmCUaOD7WJFTAsWe7LG0mA!2e0!7i13312!8i6656!5m1!1e4 b. Look at the west side of the highway, just north of Cookstove Draw: https://www.google.com/maps/@35.0169337,-111.7387005,15.97z/data=!5m1!1e4 Switch between “Terrain” and “Satellite” views. What type of mass movement do you see there, between the cliff and the road? c. As a driver, what type of mass movement would you be most concerned about here? https://www.google.com/maps/@34.8753645,-111.7548003,91m/data=!3m1!1e3!5m1! 1e4 (Remember you can use Street View.) 5. Use Oregon’s statewide landslide hazard map to answer the questions below: https://gis.dogami.oregon.gov/maps/slido/ a. Turn on only the “Mapped Landslide Data Inventory” layer. The different colors represent different types of mass movements, but we won’t worry about the differences for now. Find Mt. Hood, which is a volcano. (Look for the red color east of Portland.) Why do you think the mass movement deposits are mainly confined to gullies/valleys? What kind of mass movements might those have been? b. Look northwest of Mt. Hood at I-84 along the Columbia River. Judging from the information on the landslides map , why should you not be surprised to learn that a rock fall closed the highway in 2014? (That story: http://www.oregonlive.com/pacific- northwest-news/index.ssf/2014/02/interstate_84_landslide_nearly.html ) c. Why would the closure of I-84 due to rock fall damage be particularly inconvenient for people in the region? d. Find Newport, OR. (You can type “Newport” into the address bar.) In a previous class, we looked at the tsunami hazard map for this city. Look at the highways going north,
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