12 12 C) 10 nne Outer Core O 6 4. 2 0 4 Lower Mantle I 2 0 1000 2000 3000 4000 5
ID: 154429 • Letter: 1
Question
12 12 C) 10 nne Outer Core O 6 4. 2 0 4 Lower Mantle I 2 0 1000 2000 3000 4000 5000 6000 The graph above shows you how P-wave velocity, S-wave velocity and density change as a function of depth in the Earth (there is a version in color available on Blackboard) a) In the range from 0-2800 km depth, describe in very general terms how density and the two seismic wave velocities change with depth (in three separate sentences)? Why should the previous answer be surprising, given what you know about the equations for seismic wave velocities and how they depend on density? What does this behavior tell you about the elastic moduli and how they change with depth (You do not need any additional information, just the graph and the equations.) b) Based on the figure only(), describe (in three separate sentences) what happens to density and the seismic wave velocities as you go from the mantle into the outer core How could the changes in all three parameters be explained in terms of the properties of the materials across this boundary (you do not need any additional background information, you can answer based on this graph and your general knowledge of material/rock properties) c) What can you say about the physical properties of the inner core, based on this graph only?Explanation / Answer
A.Density increases from 0 to 700 km then it start decreasing in the asthenosphere then it again increases up to 2800km.Velocity of p waves decreases in crust and upper mantle but decreases in asthenosphere and again increases at lower mantle. S wave velocity travels in the same manner as p wave velocity but at a slower rate.
Inner core is made up of solid so both P and S waves pass through it.
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