Lab 4 - Leslie Martinez

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Northern Arizona University *

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Geology

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Feb 20, 2024

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Lab 4: Leslie Martinez Part 1: The Lithospheric Plates Maps: https://canvas.nau.edu/courses/6446/files/3029527?wrap=1 Great Plates Lesser Plates Pacific American (North, South) Eurasian Persian subplate African Somalian subplate Austal-Indian Antarctic Nazca Cocos Philippine Caribbean Arabian Juan de Fuca Caroline Bismark Scotia 1. It consists almost entirely of oceanic lithosphere. Its eastern boundary is largely a spreading boundary; its western boundary is largely a converging boundary. Pacific Plate 2. Formed entirely of oceanic lithosphere, its eastern boundary is a converging boundary; its northern, western, and southern boundaries are spreading boundaries. Nazca Plate 3. Formed almost entirely of oceanic lithosphere and volcanic island arcs, this plate is bounded almost exclusively by converging boundaries. Austral-Indian Plate 4. It consists of a central mass of continental lithosphere completely surrounded by a broad zone of oceanic lithosphere. Antarctic Plate 5. It consists of two widely separated masses of continental lithosphere, one of which is completely surrounded by oceanic lithosphere; the other bounded in the north by a converging boundary. Austral- Indian Plate 6. It consists largely of continental lithosphere. Oceanic lithosphere forms its western and northern border zone. Converging boundaries in the form of island arcs comprise much of its eastern and southern boundary. Eurasian Plate 7. It has two parallel transform fault boundaries, and each of these connects with a spreading boundary and a converging boundary. Arabian Plate? 8. It is about equally divided into continental lithosphere and oceanic lithosphere. Oceanic lithosphere forms the eastern part; continental, the western part. South American Plate or North American Plate 9. Composed entirely of oceanic lithosphere, its western and southern boundaries are spreading boundaries; its northern boundary is a converging boundary. Caribbean Plate 10. Elongate in the east-west direction, its eastern boundary is a converging boundary, and both its northern and southern boundaries are transform boundaries. two answers, Scotia Plate? And Antarctic Plate 11. A small, narrow plate sandwiched between two great plates, one of which is formed of oceanic lithosphere, the other of continental lithosphere. Scotia Plate or Juan de Fuca Plate
Lab 4: Leslie Martinez 12. It consists of a large central core of continental lithosphere, surrounded on the west, south, and southeast by oceanic lithosphere. Its northern boundary is partly a converging boundary. Its northeastern boundary is a spreading boundary. African Plate Part 2: Volcanoes and Earthquakes Question 1: What are the names and locations of volcanoes for which there is a current advisory (yellow), watch (orange), or warning (red)? For these currently active or erupting volcanoes, what type of volcano do you think each is given its tectonic setting? Make sure to zoom into those areas where the names of volcanoes are displayed so you don't miss identifying any active volcanoes. Aim to follow this format when constructing your answers : http://volcanoes.usgs.gov/ Name and location: Kilauea - Hawaii Alert level: Yellow - Advisory Tectonic setting: Pacific Plate Type of volcano: Shield - Name and location: Trident - Alaska Alert level: Yellow - Advisory Tectonic setting: Pacific Plate Type of volcano: Stratovolcano cluster - Name and location: Shishaldin - Unimak Island Alaska Alert level: Orange - WATCH Tectonic setting: Pacific Plate Type of volcano: Stratovolcano - Name and location: Great Sitkin - Alaska Alert level: Orange - WATCH Tectonic setting: Pacific Plate Type of volcano: Stratovolcano Question 2: Using your knowledge of plate tectonics, explain the general spatial pattern of these recent global earthquakes - where do they tend to occur? What does this map “tell you” about the frequencies and magnitudes of earthquakes? For example, are there many or few low magnitude earthquakes? Are there many or few high magnitude earthquakes? earthquake-hazards
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