Recitation 6 - Volcanoes
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School
Pittsburg State University *
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Course
160
Subject
Geology
Date
Jan 9, 2024
Type
Pages
3
Uploaded by JudgeElectronWren19
Name
Recitation Section:
Volcanoes Recitation
Goals:
1.
To recognize volcanoes of all shapes and sizes in a landscape.
2.
To recognize various features of volcanoes and volcanic deposits, including lava flows, pyroclastic flow deposits,
craters, calderas (both mafic and felsic), sites
of fissure eruptions, and a’a and pahoehoe flow textures.
3.
To be able to distinguish shield volcanoes, composite/strato-volcanoes, cinder cones, and calderas based on size,
steepness of slopes, and relative abundance of long lava flows, short lava flows, and pyroclastic deposits.
4.
Associate types of volcanoes with tectonic location.
The Tasks:
1.
Break into your groups. Each group will rotate between six stations with satellite images and field photos related
to one or more volcanoes or volcanic centers.
Do not spend more than 8 minutes on each station.
2.
Analyze each image. As a group, answer the following questions.
What you hand in:
The attached volcano questions.
Station 1: Galapagos Islands
Look at the satellite image of the Galapagos Islands.
The Galapagos Islands are interesting because they sit on or
near a divergent boundary but are also thought of as hot spot volcanoes.
1. What type of volcanoes are these?
2. What are the circular features?
3. How many volcanic centers do you see in the image?
4. What are the dark features radiating from the volcanic centers?
5. Look at horn of Eastern Africa on your volcanoes map.
What kind of tectonic activity is causing volcanism in
this location?
GEOL 0800:
Geology
2
Station 2: Two photos of Tolbachik Volcano, Kamchatka
1. What are the features in the foreground of the lovely panoramic photo?
Station 3: Bezymianny Volcano and Klyuchevskoy Volcano
1. Locate these volcanoes on your volcano map.
What is the tectonic setting?
2. What kind of volcanoes are these?
3. What the heck is going on at the top of the Bezymianny Volcano?
Station 4: Chillin’ with St. Helen’
1. Take a look at the aerial photographs of Mt. St. Helens from September 1973 and May 1983 or August 1992.
Briefly explain what happened to this volcano.
2. When the volcano erupted, what direction did the majority of the debris go?
(North is up on the photos.)
3. Name three volcanic hazards that may occur from eruptions at Mt. St. Helens (refer to pgs. 138-140 in your
book).
Station 5: The magnificent, the fascinating… Crater Lake
1. Take a look at Crater Lake. What do you speculate was once in place of the beautiful blue lake?
2. This volcano is within which volcanic arc?
3. In what tectonic setting does this volcano lie?
GEOL 0800:
Geology
3
4. Name another volcano in this volcanic arc that is close to Tacoma, Washington (and also Seattle!).
Name 2
hazards with which this volcano threatens the city.
(pgs. 138-140, and especially pg. 142!)
5. If I told you that you could find parts of this volcano in Montana today, how do you think they got there?
6. What from this mountain do we find in Montana?
Station 6: The Big Island, Hawaii and Piton de la Fournaise, Reunion Island
1. Locate these two volcanoes on your volcano map.
Are these two volcanoes on a convergent or divergent
boundary, or within a plate?
2. Are these volcanic islands a result of a mantle plume or of tectonic activity at a plate boundary?
3. Look at the photo labeled J. Caldera Wall.
What are the planar features?
4. Are Mauna Loa and Piton de la Fournaise composite or shield volcanoes?
How can you tell?
5. Do you expect these volcanoes to erupt mafic or felsic lavas?
Why?
6. Look at the photo of the surface of a
lava flow.
Is this a’a or pahoehoe lava?
7. Look at the ‘Big Island’ image.
What is the light blue streak emanating from the wee little crater on the
southeast part of the island (actually, it’s not so wee…)?
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