1. 2. Oceanic-Oceanic - __________________________________________________________________________________________________________________
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Features: Deep Ocean Trenches and island arcs such as of Japan Aleutian Islands (of Alaska)

2. Deep powerful earthquakes, subduction
2. Oceanic-Oceanic - ____________________________________________________________________________
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Deep powerful earthquakes, subduction

3. We are going to fly over Alaska and the Aleutian Islands
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We are going to fly over Alaska and the Aleutian Islands
What features should we be looking for?
Aleutian Islands

4. Unimak Island
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Sept Seen in this southwest-looking, low oblique photograph is Unimak Island, AK, the largest island in the Aleutian chain. The major volcano on the island (snow-capped peak in the center of the photograph), Shishaldin, rises approx ft (2860 m) and has been active during the last 175 years, with several eruption occuring recently. The volcano is locally known as “Smoking Moses.” At the southwestern end of the island is the snow-capped Pogromni Volcano. The blue lake situated in a large volcanic caldera, which can be seen midway between Pogromni and Shishaldin volcanoes, is the result of a now extinct volcano that collapsed.

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Unimak Island and Aleutian Islands, AK, Sept Three distinctive, snowcapped stratovolcanoes are easily identified in this near-vertical photograph of Unimak Island, one of many volcanic islands in the Aleutian archipelago. The Aleutian archipelago, formed by the collision of the Pacific Plate with the western extension of the North American Plate, forms a northern part of the Ring of Fire that encircles the Pacific Ocean. Unimak Island, the large island nearest the AK peninsula, is separated from the peninsula by Bechevin Bay, shown at the bottom of the photograph. Shishaldin Volcano is the westernmost and tallest of the three featured volcanoes. Isanolski Volcano is the middle volcano (8088 ft or 2465 m.)
Unimak Island

6. Page 11
Put with convergent plate boundary or volcanoes
trench

7. Convergent Boundary _____________________ - - Features:
(Ocean-ocean)
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Strong, deep earthquakes
Trench, volcanic island arcs

8. Subduction and Earthquake Depth
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Subduction and Earthquake Depth
BLUE= shallow YELLOW= moderate RED= deep

9. Continental crust colliding with continental crust
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Continental crust colliding with continental crust
What features do we expect to find here?

10. __________________ - - Features: Convergent Boundary
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__________________ -
- Features:
Convergent Boundary
(Continental-continental)
Strong, deep quakes
Folded Mountains

11. __________________ - - Features: Convergent Boundary
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__________________ -
- Features:
Convergent Boundary
(Continental-continental)
Strong, deep quakes
Folded Mountains

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We’re off to Southeastern Asia, one of the best places to observe this type of plate boundary!
China
India
Nepal

13. India colliding with Asia forming the Himalaya Mountains
3. Continental-
Continental
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India colliding with Asia forming the Himalaya Mountains

14. Page 11

15. India China Page 11 Himalayas
Tibetan Plateau and Himalayas, China, October The Himalayas and the Tibetan Plateau shown in this photograph were formed and continue to be modified by the convergent collision of two of the world’s great continental tectonic plates, the Eurasian and the Indian-Australian. As a result of this collision that started more than 65 million years ago, the average elevation of the Tibetan Plateau (shades of brown and numerous deep blue lakes) in the intermountain valleys is approx. 16,000 ft (4880 m). The lakes are fed by the snowmelt from the higher mountain ridges and peaks. Words like treeless, cold, barren, windswept, and desolate are good descriptors of the harsh environment that exists on this elevated plateau. Part of the highest mountains in the world, and sometimes called the “rooftop of the world,” the Himalayas create a formidable barrier southwest of the Tibetan Plateau. The snowcapped Himalayas trend in a southeast-northwest arc with more than 30 peaks rising to heights of 24,000 feet (7300 m). Some clouds along the lower foothills of the southwest side of the Himalayas and some snowcapped mountain ridges and peaks are visible in the photograph. Towards the horizon, hazy and dusty conditions seem to exist on the Indo-Gangetic Plain of northern India (southwest) and the Takla Makan Desert of western China (northwest.)

16. Mount Everest, Nepal
29,035 feet tall! (8850 meters)
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17. Moderate, shallow quakes
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________________ -
Transform Boundary
(Strike-slip fault)
Moderate, shallow quakes

18. c. Transform Plate Boundaries- _____________________________________
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San Andreas Fault

19. The most famous and most active transform fault
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The most famous and most active transform fault
Other faults are small or unknown in historic time
The San Andreas fault is actually made comprises many small faults in addition
Earthquakes are repetitive
The San Andreas
Fault in California

20. Page 11

21. Divergent Plate Boundaries- __________________________________
1. Ocean (example)- _________________
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Where two plates are moving apart
Mid Atlantic Ridge

22. ___________________ - - Features: Divergent Plate Boundaries
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Usually minor quakes, shallow depth
Mid- ocean ridges, volcanoes, & rift valleys

23. Earthquake Depth and Plate Tectonic Setting, Selfos, Iceland (June 2000)
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24. Plate Boundaries Data Table
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Location
Type of
Boundary
Divergent
Convergent
Transform
East Pacific Ridge
Aleutian Trench
West side of the South American Plate
San Andres Fault ✔ ✔ ✔ ✔

25. Note Packet pages 12-13 questions 1-13
They move the lithospheric plates
35°N, 18°W
Divergent
Located on a hot spot A C D 25