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Exploration Seismology Exam 1
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Hookes Law
Statement of linear relationship between stress and strain
Applies to "elastic" region of materials
σ=Cε
C: "stiffness" of spring
Shear Modulus (μ)
Ratio of shear stress to shear strain
Units of pressure (Pa)
Young's Modulus (E)
Ratio of
normal
stress to
normal
strain
Units of pressure (Pa)
Poison's Ratio (σ)
Ratio of negative of transverse strain to longitudinal strain
no units
Bulk Modulus (k)
Ratio of pressure to change in volume (dilatation)
Lame's Constant (λ)
Shear Modulus of liquids
μ=0
Stress
Force per area
Units of pressure
Strain
Change in shape or dimension
No units
Example of low poison's ratio
sponge
Example of high poison's ratio
Lead cylinder
Group Velocity
Connect inside branches of Christmas tree image
Phase Velocity
Branches of Christmas tree
Relationship of Amplitude and Radius
Relationship of Energy and Amplitude
(Directly Proportional)
Isotropic
All properties in a material are the same throughout
Relationship of Energy and Radius
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)
Huygen's Principle
Every point on a wavefront serves as a new source of waves
Snell's Law
Slope of refracted arrival
Reflection Coefficient
Transmission Coefficient
Hyperbolic Travel Time Equation
Standard form for travel-time expression
Slope of direct arival
Fermat's principle
The first arrival of a wave will be from the path of least resistance
Max S-wave velocity
.7 of p-wave velocity
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
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Description:
Wave constants, etc.
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