Lab 4 - Leslie Martinez
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Geology
Date
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
Lab 4: Leslie Martinez
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When looking on the map we can see there have been 1645 earthquakes in the past month and all the earthquakes seem to be on Pacific Plate “Ring of Fire”
, all of these earthquakes in the past month all have different high and low magnitudes. The highest magnitude that I have seen is 7.1 the Banda Sea and there seems to be many low magnitude earthquakes starting at 2.5.
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