Shield Volcano completed lab
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Triton College *
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Course
100
Subject
Geology
Date
Dec 6, 2023
Type
Pages
5
Uploaded by HighnessBisonPerson884
Shield Volcanoes
1. The following table shows the distance the various islands that make up the
Hawaiian island chain are from the big island of Hawaii and the time of last eruption.
Island
Distance from
Date of last Eruption
Hawaii in km
(millions of years)
Hawaii
0
Present
Maui
180
1.3
Molokai
280
1.8
Oahu
395
3.6
Kauai
540
5.6
Niihau
650
6.4
Nihoa
775
7.5
Necker
1040
10.0
Gardener
1410
11.3
Layson
1885
14.1
Lisionski
2205
15.1
Midway
2455
16.2
Q1. The oldest island on the map is _________________________
Q2. The youngest island on the map is _______________________
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Q3. In what direction is the only active volcano located? (High light your answer)
a. northeast
b. middle
c. southeast
Q4. Using the table on the first page how does the time of the last eruption relate to
the increase in distance from the island of Hawaii?
Q5. From your answers to questions 1-4, in what direction is the sea floor moving?
Q6. Where is all this lava coming from to make all these islands?
Q7. What is the name of the
most recently
active volcano in Hawaii?
2.
To determine if the seafloor is spreading at the same rate now as it did when
this island chain was first formed, use the data in the table to determine the
average spread rate of the Pacific Plate for the past 1.3 million years.
a. This can be calculated by dividing the distance between Hawaii and Maui
by 1,300,000 years.
______________________ =
km / year
1,300,000
b. This is a really meaningless answer so let's convert your answer of km/year
to cm / year by moving the decimal point 5 places to the right.
Record your answer below.
__________ cm / year
3.
Now do the same to calculate the spreading rate between Necker and Midway.
a. To do this, subtract the distance Necker is from Hawaii from the distance
Midway is from Hawaii.
This is how far the seafloor spread in 6.2 million
years (16.2 million - 10 million).
________________________ =
km / year
6,200,000
b. Again a meaningless answer. Move the decimal point 5 places to the right.
Record your answer below.
__________ cm / year
Q8. Compare answer 2b to answer 3b, what has happened to the spreading
rate of the Pacific Plate?