Homework: questions on Journal of Geophysical Research article
Homework: questions on Journal of Geophysical Research article
by Davis, Suppe, and Dahlen*
Here’s our fourth journal article of the semester. In my opinion, it is the most challenging article you will read for this class. It may interest you to know, though, that this article arose out of Dan Davis’ undergraduate senior research project. Remember, it helps to focus your attention on what you want to glean from the article. The questions below are, as always, just variations on the fundamental questions I expect you to have in mind any time you read a journal article, and should guide you to an understanding of this complex study. It may be helpful to know in advance, too, that this paper is really just about Mohr-Coulomb failure, frictional sliding, and the effects of pore fluid pressure – it really builds on what we’ve been doing in class recently.
In preparation for our class discussion, please answer the following questions. Please bring two copies of your typewritten answers to these questions to class next Wednesday. (I suggest getting started this weekend though, because you will also have a take-home quiz due Wednesday, as usual.) One is to turn in at the beginning of class; one is for your own reference during the discussion.
When you come across unfamiliar terms, look them up in a geologic dictionary! There are dictionaries in the computer lab (room 123). If you can’t find the terms there, email me.
1. Pretend you are playing “Jeopardy,” and read the introduction to the paper (the first two pages). What basic research question are the authors trying to answer?
2. What makes that research question significant? That is, why should we care about the critical taper model?
3. The first half of this paper (p. 1153-1161) lays out the mathematics behind the critical taper model. The math determines what data they will collect, to apply the model.
a. What mathematical relationship do the authors predict, based on their model? That is, what is the equation for critical taper, and how does it depend on what variables?
b. For the sandbox model, what data did the authors collect?
c. For Taiwan’s fold-and-thrust belts, what data did the authors collect?
d. For other fold-and-thrust belts, what data did the authors collect?
4. a. Do the data fit the wedge model for the sandbox? For Taiwan? For other fold-and-thrust belts?
b. What far-reaching implications do the authors infer?
c. What limits do the authors impose on the use of their model? That is, under what conditions do they say it is not applicable?
5. Do you think that the data they collected supports their conclusions? Why or why not?
6. What questions, if any, does this article raise for you?
* Davis, Suppe, and Dahlen, 1983, Mechanics of fold-and-thrust belts and accretionary wedges. Journal of Geophysical Research, v. 88, no. B2, p. 1153-1172.
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