Geology Reference
In-Depth Information
Exercise 4 • Volcanoes and Volcanic Hazards
63
FIGURE 4.8
Oblique aerial photograph of the upper cone of Mount Rainier from the northwest, showing the Puyallup Glacier and
the steep upper slopes. Note also the crater at the top of the volcano, which has been filled in with younger eruptive products. Photo
courtesy of U.S. Geological Survey Austin Post photograph collection.
that alter them, or if the rocks are shaken during a regional (not
volcano-related) earthquake. Use the topographic maps in this
exercise and at the back of the topic to analyze areas that may
be at risk from landslides and lahars. Sketch on the topo-
graphic map (Figure 4.9 in the back of the topic) areas that may
be at risk from landslides and lahars from Mount Rainier.
Explain your choice of areas, and your decision of how far to
extend the areas from the peak of the mountain.
4. How are the hazards in Orting likely to be different from
hazards in Seattle or Tacoma? Refer to Figure 4.9, the color
plate in the back of the topic.
5. Review the aerial photograph (Figure 4.10) and topogra-
phy of Orting as shown on Figure 4.9.
a.
If you were in charge of planning an evacuation
because of an imminent volcanic hazard, what geological,
economic, and social factors should you include in devel-
oping your plan?
3. What volcanic hazards do the citizens of Orting need to be
aware of?
