Page 79 - Laboratory Manual in Physical Geology

ACTIVITY 2.6 Using Earthquakes to Identify Plate Boundaries

Name: ______________________________________ Course/Section: ______________________ Date: ____________

A. Refer to FIGURE 2.2 for background on how the depth of earthquake foci is related to plate tectonics. On the map below, use

a red colored pencil or pen to draw lines (as exactly as you can) that indicate where plate boundaries occur at Earth’s surface.
Then label the East Pacific Rise, Galapagos Rise, Chile Rise, and all of the plates (refer to FIGURE 2.5 ).

100°W 90°W 80°W
Guyana
Venezuela

110°W Columbia

10°N

Brazil
Ecuador
Peru

0°

Bolivia

Para-
guay
10°S

B´
B

20°S Argentina

Chile

0 500 1000 km

30°S 120°W 40°S 100°W 80°W

▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲
Map of Earthquake Activity in the Eastern Pacific Ocean and South America
Shallow-focus Intermediate-focus Deep-focus ▲ ▲ ▲ ▲ Trench
earthquakes earthquakes earthquakes
0–69 km deep 70–299 km deep 300–700 km deep (Data from U.S. Geological Survey)

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