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Author Question: How do we know that Earth is inhomogeneous? What will be an ideal ... (Read 31 times)

jeatrice

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on: Jul 16, 2018
How do we know that Earth is inhomogeneous?
 
  What will be an ideal response?

Question 2

Which type of wave arrives first at an earthquake recording station? Why do the waves not arrive at the same time?
 
  What will be an ideal response?


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carolinefletcherr

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Reply #1 on: Jul 16, 2018
Answer to Question 1

Oceanic crust is different than continental crust. The density of the entire Earth is 5.5 g/cm3 but typical mantle only has a density of 3.2 g/cm3.

Answer to Question 2

The P waves arrive first, then the S waves, then finally the surface waves. Wave velocities reflect compositional differences in materials.


jeatrice

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Reply 2 on: Jul 16, 2018
Great answer, keep it coming :)

Joy Chen

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

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