Applied Geophysics

Midterm Review

The exam will consist of definitions and short answers/estimations. All of the material covered so far on gravity and seismic methods is far game, but I strongly recommend that you review the items in this list.

Gravity

Definitions and Values:

Universal Gravitational Constant (G)

Gravitational attraction at the surface (g)

Concepts:

Geoid

Reference Spheroid

Force Equation

Gravitational Potential

Isostacy

Anomalies:

Field produced by point mass

Approximate anomalies produced by simple shapes (like a semi-infinite slab)

Field Procedures and Data Reduction:

Instruments (LaCoste-Romberg)

Sources of Error in data collection

Normal Corrections (Free Air, Bouguer, etc.)

Seismic

Lamé Parameters

Vibroseis

MiniSosie

Wave types (P, SV, SH, Rayleigh, Diffracted, Refracted, Reflected)

Velocities of waves; including the time average equation.

Basics of running a refraction survey

Raypaths of refracted, reflected, and direct waves

Signal Processing Stuff like:

Convolution and Deconvolution

Normal Moveout

Common Midpoint Gathers

Migration

Stacking