homework5

# homework5 - In which layer is an s-wave at its minimum...

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SIO 10 – Winter 2010 Homework # 5 Due Friday, February 19 Lectures 13-16, Chapters 10, 11 and Interlude D 20 Points 1: a) What are the 3 types of faults, what plate boundary are they found in, and sketch their sense of motion. Make sure to indicate the hanging wall and footwall. (2 pts) b) Describe the elastic rebound theory. (1 pt) c) List the four seismic waves generated by an earthquake in order of relative velocity (fastest first). (2 pts) d) The difference in arrival times between P and S waves can be used to determine how far from a seismometer an earthquake occurred. Use the following distances to draw circles around each seismometer (A, B, and C). Where all three intersect, draw a star to indicate the earthquake epicenter. (2 pts) 2: a) What is the s-wave shadow zone and what does it tell us about the interior of the Earth? (1 pt) b) At what depth is a p-wave at its maximum velocity?

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Unformatted text preview: In which layer is an s-wave at its minimum velocity? (2 pts) c) Why do seismologists see such a strong signal associated with the Moho? (1 pt) 3, Google Earth Exercise: Go to 35 o 16’17”N, 119 o 49’39”W in Google Earth. (The Ruler tool in Google Earth will help greatly with this exercise) a) What is this feature, sketch its sense of motion and what is its heading? (2 pts) b) If the feature is 3800 years old, what is the rate of motion here (in mm/yr)? (1 pt) c) Going northward at the same heading, what major city does this feature cut through? (1 pt) d) Assuming the same heading and rate, how long will it take this city to reach the Aleutian Trench? (1 pt) 4: a) What is an orogeny? (1 pt) b) What is the difference between brittle and ductile deformation? (1 pt) c) What is isostasy? After a glacier melts, what does isostasy say will happen to the Earth’s crust? ( 2 pts)...
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