# Exploration Seismology Exam 1

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1. Hookes Law
Statement of linear relationship between stress and strain

Applies to "elastic" region of materials

σ=Cε

C: "stiffness" of spring
2. Shear Modulus (μ)
Ratio of shear stress to shear strain

Units of pressure (Pa)
3. Young's Modulus (E)
Ratio of normal stress to normal strain

Units of pressure (Pa)
4. Poison's Ratio (σ)
Ratio of negative of transverse strain to longitudinal strain

no units
5. Bulk Modulus (k)
Ratio of pressure to change in volume (dilatation)

6. Lame's Constant (λ)
7. Shear Modulus of liquids
μ=0
8. Stress
Force per area

Units of pressure
9. Strain
Change in shape or dimension

No units
10. Example of low poison's ratio
sponge
11. Example of high poison's ratio
12. Group Velocity
Connect inside branches of Christmas tree image
13. Phase Velocity
Branches of Christmas tree
14. Relationship of Amplitude and Radius
15. Relationship of Energy and Amplitude

(Directly Proportional)
16. Isotropic
All properties in a material are the same throughout
17. Relationship of Energy and Radius
18. Sampling Theorem
A signal can be competely reconstructed if it is sampled at least 2x per cyle

If not, it appears to be a totally different signal (aliasing)
19. Huygen's Principle
Every point on a wavefront serves as a new source of waves
20. Snell's Law
21. Slope of refracted arrival
22. Reflection Coefficient

23. Transmission Coefficient
24. Hyperbolic Travel Time Equation
25. Standard form for travel-time expression

26. Slope of direct arival
27. Fermat's principle
The first arrival of a wave will be from the path of least resistance
28. Max S-wave velocity
.7 of p-wave velocity
29. 4 assumptions of boundary conditions (z equations)
Continuity of Normal Displacement

Continuity of Tangential Displacement

Continuity of Normal Stress

Continuity of Tangential Stress
 Author: KarlPeterson ID: 239541 Card Set: Exploration Seismology Exam 1 Updated: 2013-10-09 19:27:46 Tags: Exploration Seismology Exam Folders: Description: Wave constants, etc. Show Answers: