Activity 2.8 - Using Earthquakes to Identify Plate Boundaries A. Use Figures A2.8.1 and A2.8.2 along with the associated text to complete the cross section below and answer the following questions. Plot the locations of earthquake foci on the cross-section (Fig. A2.8.3) Location East or West of Trench Depth of Earthquake (or volcano location) Location East or West of Trench Depth of Earthquake (or volcano location] Location East or West of Trench Depth of Earthquake (or volcano location) 200 km West 20 km 260 Num East 120 km 450 km East 150 km 160 km West 25 km 300 Num East 110 km 500 km East 30 km 60 km West 10 km 330 km Eest 40 km 500 km East 160 km 30 km West 25 km 330 Jum East 120 km 500 km East 1B0 km ◇ (trench) 20 km 390 lum East 40 km 590 km East 20 km 50 km East 60 km 390 km East 140 km 710 km East 30 km 80 km East 70 km 410 Nom East 25 km 780 km East 530 km 100 km East 10 km 120 km East 80 km 410 km El 110 km 800 km East 560 km 200 km East 110 km Figure 220 km East 30 km 410 lum East 450 om East 150 km 50 km 820 km East 610 km 8.80 km East 620 km A2.8.2 © 2021 Pearson Education, Inc. B West Distance East or West of Trench (km) East B Depth of Earthquake (km) 100 200 300 400 500 600 D 200 100 Trench 100 200 300 400 500 600 700 800 900 volcanoes (height exaggerated) 700 Figure A2.8.3 © 2021 Pearson Education, Inc. 1. What kind of plate boundary is shown in your cross-section? 2. Draw a curve in the cross-section to show your interpretation of where the top surface of the subducting plate is located. 3. Label the part of your cross-section that probably represents earthquakes in the subducting slab. Then label the part of your cross-section that probably represents earthquakes in the South American Plate above the subducting Nazca Plate. How can you tell? 4. At what depth does magma probably originate below the volcanoes, just above the subducting plate: km. REFLECT & DISCUSS What is the deepest earthquake plotted on your cross-section? Why do you think that earthquakes occur at hundreds of kilometers depth along subducting slabs but not elsewhere in the mantle at that same depth? Department of Geosciences, University of Arkansas, 2022 Text adapted for use in UARK Physical Geology Laboratory classes by H. Turner from the eText of Laboratory Manual in Physical Geology, 12th edition by AGI/NAG 3 GEOL 111
Activity 2.8 - Using Earthquakes to Identify Plate Boundaries A. Use Figures A2.8.1 and A2.8.2 along with the associated text to complete the cross section below and answer the following questions. Plot the locations of earthquake foci on the cross-section (Fig. A2.8.3) Location East or West of Trench Depth of Earthquake (or volcano location) Location East or West of Trench Depth of Earthquake (or volcano location] Location East or West of Trench Depth of Earthquake (or volcano location) 200 km West 20 km 260 Num East 120 km 450 km East 150 km 160 km West 25 km 300 Num East 110 km 500 km East 30 km 60 km West 10 km 330 km Eest 40 km 500 km East 160 km 30 km West 25 km 330 Jum East 120 km 500 km East 1B0 km ◇ (trench) 20 km 390 lum East 40 km 590 km East 20 km 50 km East 60 km 390 km East 140 km 710 km East 30 km 80 km East 70 km 410 Nom East 25 km 780 km East 530 km 100 km East 10 km 120 km East 80 km 410 km El 110 km 800 km East 560 km 200 km East 110 km Figure 220 km East 30 km 410 lum East 450 om East 150 km 50 km 820 km East 610 km 8.80 km East 620 km A2.8.2 © 2021 Pearson Education, Inc. B West Distance East or West of Trench (km) East B Depth of Earthquake (km) 100 200 300 400 500 600 D 200 100 Trench 100 200 300 400 500 600 700 800 900 volcanoes (height exaggerated) 700 Figure A2.8.3 © 2021 Pearson Education, Inc. 1. What kind of plate boundary is shown in your cross-section? 2. Draw a curve in the cross-section to show your interpretation of where the top surface of the subducting plate is located. 3. Label the part of your cross-section that probably represents earthquakes in the subducting slab. Then label the part of your cross-section that probably represents earthquakes in the South American Plate above the subducting Nazca Plate. How can you tell? 4. At what depth does magma probably originate below the volcanoes, just above the subducting plate: km. REFLECT & DISCUSS What is the deepest earthquake plotted on your cross-section? Why do you think that earthquakes occur at hundreds of kilometers depth along subducting slabs but not elsewhere in the mantle at that same depth? Department of Geosciences, University of Arkansas, 2022 Text adapted for use in UARK Physical Geology Laboratory classes by H. Turner from the eText of Laboratory Manual in Physical Geology, 12th edition by AGI/NAG 3 GEOL 111
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
Related questions
Question
![Activity 2.8 - Using Earthquakes to Identify Plate Boundaries
A. Use Figures A2.8.1 and A2.8.2 along with the associated text to complete the cross section below and answer the
following questions. Plot the locations of earthquake foci on the cross-section (Fig. A2.8.3)
Location East
or West of
Trench
Depth of
Earthquake (or
volcano location)
Location East
or West of
Trench
Depth of
Earthquake (or
volcano location]
Location East
or West of
Trench
Depth of
Earthquake (or
volcano location)
200 km West
20 km
260 Num East
120 km
450 km East
150 km
160 km West
25 km
300 Num East
110 km
500 km East
30 km
60 km West
10 km
330 km Eest
40 km
500 km East
160 km
30 km West
25 km
330 Jum East
120 km
500 km East
1B0 km
◇ (trench)
20 km
390 lum East
40 km
590 km East
20 km
50 km East
60 km
390 km East
140 km
710 km East
30 km
80 km East
70 km
410 Nom East
25 km
780 km East
530 km
100 km East
10 km
120 km East
80 km
410 km El
110 km
800 km East
560 km
200 km East
110 km
Figure
220 km East
30 km
410 lum East
450 om East
150 km
50 km
820 km East
610 km
8.80 km East
620 km
A2.8.2
© 2021 Pearson Education, Inc.
B West
Distance East or West of Trench (km)
East
B
Depth of Earthquake (km)
100
200
300
400
500
600
D
200 100 Trench 100 200 300 400 500 600 700 800 900
volcanoes (height exaggerated)
700
Figure
A2.8.3
© 2021 Pearson Education, Inc.
1. What kind of plate boundary is shown in your cross-section?
2. Draw a curve in the cross-section to show your interpretation of where the top surface of the subducting plate is located.
3. Label the part of your cross-section that probably represents earthquakes in the subducting slab. Then label the part of
your cross-section that probably represents earthquakes in the South American Plate above the subducting Nazca Plate.
How can you tell?
4. At what depth does magma probably originate below the volcanoes, just above the subducting plate:
km.
REFLECT & DISCUSS What is the deepest earthquake plotted on your cross-section? Why do you think that earthquakes
occur at hundreds of kilometers depth along subducting slabs but not elsewhere in the mantle at that same depth?
Department of Geosciences, University of Arkansas, 2022
Text adapted for use in UARK Physical Geology Laboratory classes by H. Turner from the eText of Laboratory Manual in Physical Geology, 12th edition by AGI/NAG
3
GEOL 111](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F181a2a94-4a19-49a0-a19f-f691ca399da9%2F69787cac-8322-442b-9ade-bff99d08fbc6%2Ftd1qgmv_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Activity 2.8 - Using Earthquakes to Identify Plate Boundaries
A. Use Figures A2.8.1 and A2.8.2 along with the associated text to complete the cross section below and answer the
following questions. Plot the locations of earthquake foci on the cross-section (Fig. A2.8.3)
Location East
or West of
Trench
Depth of
Earthquake (or
volcano location)
Location East
or West of
Trench
Depth of
Earthquake (or
volcano location]
Location East
or West of
Trench
Depth of
Earthquake (or
volcano location)
200 km West
20 km
260 Num East
120 km
450 km East
150 km
160 km West
25 km
300 Num East
110 km
500 km East
30 km
60 km West
10 km
330 km Eest
40 km
500 km East
160 km
30 km West
25 km
330 Jum East
120 km
500 km East
1B0 km
◇ (trench)
20 km
390 lum East
40 km
590 km East
20 km
50 km East
60 km
390 km East
140 km
710 km East
30 km
80 km East
70 km
410 Nom East
25 km
780 km East
530 km
100 km East
10 km
120 km East
80 km
410 km El
110 km
800 km East
560 km
200 km East
110 km
Figure
220 km East
30 km
410 lum East
450 om East
150 km
50 km
820 km East
610 km
8.80 km East
620 km
A2.8.2
© 2021 Pearson Education, Inc.
B West
Distance East or West of Trench (km)
East
B
Depth of Earthquake (km)
100
200
300
400
500
600
D
200 100 Trench 100 200 300 400 500 600 700 800 900
volcanoes (height exaggerated)
700
Figure
A2.8.3
© 2021 Pearson Education, Inc.
1. What kind of plate boundary is shown in your cross-section?
2. Draw a curve in the cross-section to show your interpretation of where the top surface of the subducting plate is located.
3. Label the part of your cross-section that probably represents earthquakes in the subducting slab. Then label the part of
your cross-section that probably represents earthquakes in the South American Plate above the subducting Nazca Plate.
How can you tell?
4. At what depth does magma probably originate below the volcanoes, just above the subducting plate:
km.
REFLECT & DISCUSS What is the deepest earthquake plotted on your cross-section? Why do you think that earthquakes
occur at hundreds of kilometers depth along subducting slabs but not elsewhere in the mantle at that same depth?
Department of Geosciences, University of Arkansas, 2022
Text adapted for use in UARK Physical Geology Laboratory classes by H. Turner from the eText of Laboratory Manual in Physical Geology, 12th edition by AGI/NAG
3
GEOL 111
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