« previous next »

Author Question: You have collected data on seismic-wave velocities in rocks that exist a few hundred meters below ... (Read 107 times)

P68T

  • Hero Member
  • *****
  • Posts: 509
on: Jul 16, 2018
You have collected data on seismic-wave velocities in rocks that exist a few hundred meters below the surface.
 
  Use information in Figure 8.18 to determine what kind of rock(s) is suggested by these P-wave velocities: 2.25 km/s; 4 km/s; 6.25 km/s; 6.75 km/s; 8 km/s.
  What will be an ideal response?

Question 2

How do we know that P and S waves do not travel through Earth at constant velocities?
 
  What will be an ideal response?


raenoj

  • Sr. Member
  • ****
  • Posts: 340
Reply #1 on: Jul 16, 2018
Answer to Question 1

2.25 km/s = unconsolidated sediment or sandstone or limestone
4 km/s = sandstone or limestone
6.25 km/s = granite
6.75 km/s = basalt or lower continental-crust metamorphic rocks
8 km/s = peridotite

Answer to Question 2

Real P and S wave travel times from decades of earthquake records do not match the travel times you would predict based on the assumption that P and S wave velocities are constant throughout Earth. The P and S waves arrive sooner than predicted.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

P68T

  • Hero Member
  • *****
  • Posts: 509
Reply #2 on: Jul 16, 2018
Correct answers!


raenoj

  • Sr. Member
  • ****
  • Posts: 340
Reply #3 on: Jul 16, 2018
Great! Please up vote :D


« previous next »
 

Did you know?

Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

Did you know?

More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.

Did you know?

To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.

Did you know?

Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.

Did you know?

There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.

Wave Travel Wave Travel
Treatment of Depression with Ketamine The graph shows the effects of ketamine on symptoms of depress Treatment of Depression with Ketamine The graph shows the effects of ketamine on symptoms of depress
Material safety data sheets (MSDS), now called safety data sheets (SDS), should be readily available ... Material safety data sheets (MSDS), now called safety data sheets (SDS), should be readily available ...
How to find the quartiles and percentiles for a data set How to find the quartiles and percentiles for a data set
Boys Climbing Rocks And Diving, Tomb Of Hunting And Fishing Boys Climbing Rocks And Diving, Tomb Of Hunting And Fishing
Basic Marketing Research: Using Microsoft Excel Data Analysis Basic Marketing Research: Using Microsoft Excel Data Analysis
Video: Exocytosis - secretion

For a complete list of videos, visit our video library