SO461
Geological Oceanography
Fall 2008 Test
1--A version
|
Diagrams |
4
@ 20 points |
80 |
|
|
Short
answer |
4
@ 5 points |
20 |
|
|
Total |
|
100 |
|
Authorized
reference:
Diagrams: These should clearly indicate understanding
of the procedures and concepts involved, and should be well thought out with
appropriate terms and details to support your answer. You must answer four of the five questions.
Short Answer: The questions should be answered with
several sentences (no more than a short paragraph). You must answer four of the
five questions.
Budget your time. If you try to look up everything in the text
book, you will run out of time. Do not
leave anything blank, and note that I am looking for an understanding of the
important concepts and appropriate use to terminology. An answer that does this will get more credit
than finding and copying a sentence in the book that includes the word asked
for.
All work on this exam is
individual. You may not any materials
(books, notes, computers), and you may not use IM, texting, talking, or any
other means to communicate with other individuals.
(3) What are these magnetic
profiles actually measuring?
(8) Label at least five anomalies
on each profile with your estimate of the age in millions of years, and show
where they occur on the time line at the bottom.
(3) On each profile, mark the
location or the ridge or indicate the direction in which you would look to find
the ridge that created this seafloor.
(3) How does the spreading rate
vary for each profile? For one profile,
show how you would calculate it, and then indicate whether the other two would
have faster or slower spreading rates.
(3) How do these profiles relate
to the Euler pole for the two plates involved?
Figure 2. The diagram on the previous page shows a
sequence of rocks that you found while walking through the scenic mountains of
Figure 3. The diagram above shows the focal mechanisms
for selected earthquakes in a region that is about 700 km across.
Pick two representative and
distinctly different earthquakes that will do the best job of explaining what
is happening, and show the likely orientation of the fault plane and the type
of fault involved. Be specific and
include numbers; list and defend any assumptions you make.
On the diagram, sketch a
possible plate boundary or boundaries and indicate the plate motions suggested
by the earthquake data.
.
SO461
Geological Oceanography
Fall 2008 Test 1--B version Significant Differences
SO461 Geological Oceanography
Fall 2008 Test 1--Makeup Exam Differences
What did the magnetometer used to create these profiles actually record?
Label at least five anomalies on each profile with your estimate of the age in millions of years, and show where they occur on the time line at the bottom. Insure that you label an anomaly near the edges of each profile.
On each profile, mark the location or the ridge or indicate the direction in which you would look to find the ridge that created this seafloor.
How does the spreading rate vary for each profile? For one profile, show how you would calculate it, and then indicate whether the other two would have faster or slower spreading rates.
Sketch a possible set of plate boundaries that could create this pattern of anomalies.