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Reflection Survey Method
Reflected waves from the interfaces between materials of significant different
elastic properties (density and seismic velocity) are used for this type of survey.
More specifically, a special acquisition and processing method called “CDP
(common-depth-point) method” is used and the final product from this survey is a
section that depicts cross-sectional image of the subsurface below the surveyed
line (Fig. 1). This method has been invented and used traditionally for the purpose
of exploration for natural resources (oil, coal, etc.). Since early 1980s, its use for
shallow geotechnical engineering projects became active (Fig. 1). Comparing
these types of reflection surveys together, they are different in dimensions surveyed
and resolution achieved. Field acquisition and data processing procedures are
normally much more costly than the other types of the seismic survey.
Reflected waves from the interfaces between materials of significant different
elastic properties (density and seismic velocity) are used for this type of survey.
More specifically, a special acquisition and processing method called “CDP
(common-depth-point) method” is used and the final product from this survey is a
section that depicts cross-sectional image of the subsurface below the surveyed
line (Fig. 1). This method has been invented and used traditionally for the purpose
of exploration for natural resources (oil, coal, etc.). Since early 1980s, its use for
shallow geotechnical engineering projects became active (Fig. 1). Comparing
these types of reflection surveys together, they are different in dimensions surveyed
and resolution achieved. Field acquisition and data processing procedures are
normally much more costly than the other types of the seismic survey.
| Fig. 1. |