Seismic Reflection Surveys

Seismic Application Include
General geologic structure
Faults and other hazards
Landfill investigation
Overburden thickness
Rock rippability and quality
Water table depth
Bedrock depth

Seismic Reflection follows the law of mirror images the angle of reflection from a surface is equal to the angle of incidence. Shots are fired, in turn, at each of the geophone positions and active geophones are progressively added ahead of the shots, and taken up from behind the shots, in a roll–along fashion. At each subsurface boundary, across which the elastic and density parameters differ, a percentage of the energy in the wave is reflected back to the surface where it is recorded. If a particular boundary is horizontal, the reflection point will be half way between the shot and any given geophone. Reflecting boundaries are mapped out as the system rolls along. Placing each reflection point in its proper place in the subsurface requires intense and complicated processing of the collected information.

Seismic reflection plot of the Wasatch Fault in northern Utah. Indicated is the main normal fault and an associated antithetic ault.


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