midterm 3 eosc
.pdf
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School
University of British Columbia *
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Course
EOSC 114 9
Subject
Geology
Date
Jan 9, 2024
Type
Pages
2
Uploaded by CommodoreCloverIbis9
1. A property developer is planning to build a new town in an area that is prone to landslides. Which of
the following is the best way to keep the town safe from landslides? - placing the town in a different
location
2.
Which of the following causes is the most important reason we have more landslides in British
Columbia than in other provinces in Canada? - rainfall
3. Which of the following is the best definition for angle of repose? - The angle where the shear stress
on the slope is exactly balanced by shear strength
4. Which statement about landslides is
TRUE
?- triggers initiate motion
5. In which of the following locations would you be most concerned about frost wedging/freeze thaw
increasing rockfall? - Whistler
6. What failure mode (motion) would you expect if a substantial landslide occurred in the location
depicted below? - fall
7. Forestry roads in British Columbia are sometimes poorly made and lead to landslides. Why? - undercut
and overload slopes
8. Which of the following was not a possible cause of the Oso Landslide in Washington State? - quick clay
9. The human response to ‘creep’ is likely to be____evacuation________.
10. Which of the following landslide causes
CANNOT
also be a trigger? - steep slope angle
11. Which of the following does
NOT
indicate that a slope could be unstable? - A heavy rain storm
12. What is the classification (name) of the landslide circled in the image below? - A debris flow
13. The graph above represents the gradual weakening of a slope over time. At which of the following
points on the line is the slope most likely to fail? - D
14. The relatively high shear strength of quick clays can be reduced to almost zero by __lowering the
water content of clay_________.
15. A highway is threatened by very large blocks of rock (40 metres by 10 metres by 2 metres) that could
slide onto the road. Which of the following methods would be the best choice for mitigation, both
effective and not too expensive? - rocks, bolts or anchor
16. What type of explosive eruption was the 79 AD eruption of Mt. Vesuvius, Italy, which buried Pompeii
and Herculaneum? - Plinean
17. Which of the following volcanic hazards can occur
WITHOUT
an accompanying eruption? - lahar
18. The shape of a shield volcano is the result of many eruptions of ___low___________ viscosity
___mafic lavas____
19. The 1980 eruption of Mt St Helens was a VEI of 5, erupting ~1 km
3
of tephra. The Mt Pinatubo
eruption of 1991 was a VEI of 6, approximately how much tephra was erupted during the Mt Pinatubo
eruption?- ~10km3
20. Which of the following does
NOT
depend on the chemical composition of an extrusive igneous
rock/lava? - crystal size
21. Which of the following monitoring methods is used to detect the volume and type of gas being
emitted by a volcano? - tiltmeters
22. If you were put in charge of starting a monitoring program for a newly discovered dormant
stratovolcano showing renewed signs of activity, what should be your order of priorities? - Mapping of
previous hazards, seismometers, global positioning systems, tiltmeters
23. Explosive eruptions disperse tephra as____lava flows and domes__________.
24. On the diagram to the right which area on the hazard map represents the region of likely
air fall hazard? - A
25. Also considering the diagram in Question 84, this is a hazard map for a stratovolcano or composite
cone, which two of the hazards shown would also be most likely to be found on a cinder cone hazard
map? - D&E
26. The most likely place to find an active volcano is __. - in a mountain range above a subduction zone
27. Mt Baker is an example of a __stratovolcano_____.
28. How does viscosity affect explosivity? - Low viscosity magma lets gas escape, increasing the pressure
29.
30. A high silica igneous rock with large interlocking crystals is called a(n) ____rhyolite_______.
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