« previous next »

Author Question: You have collected data on seismic-wave velocities in rocks that exist a few hundred meters below ... (Read 108 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?

Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.

Did you know?

Everyone has one nostril that is larger than the other.

Did you know?

HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.

Did you know?

The longest a person has survived after a heart transplant is 24 years.

Did you know?

People often find it difficult to accept the idea that bacteria can be beneficial and improve health. Lactic acid bacteria are good, and when eaten, these bacteria improve health and increase longevity. These bacteria included in foods such as yogurt.

An ECG strip showing a normal sinus rhythm with the P wave, QRS complex, and T wave identified. An ECG strip showing a normal sinus rhythm with the P wave, QRS complex, and T wave identified.
How Seismic Waves Pass through Rock How Seismic Waves Pass through Rock
Leonardo da Vinci, Madonna of the Rocks. Leonardo da Vinci, Madonna of the Rocks.
Apply effleurage with wave motion to posterior cervical region. Use fingertips to slide along ... Apply effleurage with wave motion to posterior cervical region. Use fingertips to slide along ...
Slow-wave sleep Slow-wave sleep
Basic Marketing Research: Using Microsoft Excel Data Analysis Basic Marketing Research: Using Microsoft Excel Data Analysis
Video: Cellular Defects - Osteoblasts, Osteoclasts and Osteocytes

For a complete list of videos, visit our video library