« previous next »

Author Question: You have collected data on seismic-wave velocities in rocks that exist a few hundred meters below ... (Read 119 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?

Warfarin was developed as a consequence of the study of a strange bleeding disorder that suddenly occurred in cattle on the northern prairies of the United States in the early 1900s.

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?

Excessive alcohol use costs the country approximately $235 billion every year.

Did you know?

The average adult has about 21 square feet of skin.

Did you know?

It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.

Evaluation of a child for cystic fibrosis with a sweat chloride test. Sweat is being collected under Evaluation of a child for cystic fibrosis with a sweat chloride test. Sweat is being collected under
Hokusai, The Great Wave off Kanagawa, from the series Thirty-Six Views of Mount Fuji. Hokusai, The Great Wave off Kanagawa, from the series Thirty-Six Views of Mount Fuji.
Data from more than 22,000 men over the age of 40, showing the relationship between birth weight and ... Data from more than 22,000 men over the age of 40, showing the relationship between birth weight and ...
Data management questions Data management questions
Data management short answer q Data management short answer q
Data for a Hypothetical Paternity Test Using 13 CODIS Genes Data for a Hypothetical Paternity Test Using 13 CODIS Genes
Video: EpiPen Animation (Part 1)

For a complete list of videos, visit our video library