Time-frequency analysis of seismic reflection data
bookPart
When seismic waves propagate through the subsurface, energy is reflected back toward the surface at acoustic impedance contrasts. The strength of this impedance contrast is called the reflectivity. The seismic cross section of Figure 8.1(b) is a representation of the (band-limited) reflectivity of the subsurface. If the seismic wave velocity is known, then the time axis can be converted to depth. In the image of Figure 8.1(b), a two-way (down and up) travel time of 1 sec corresponds roughly to a depth of 1 km below the surface. When a rapid change in acoustic impedance occurs at a certain depth, this generally implies a change in the composition of the rocks. As a result, it is possible to make an educated guess of the geologic structure of the subsurface, based on the seismic image. © 2003 by Taylor & Francis Group, LLC.
TNO Identifier
953626
ISBN
9781420042
Publisher
CRC Press
Source title
Applications in Time-Frequency Signal Processing
Editor(s)
Papandreou-Suppappola, A.
Place of publication
Boca Raton
Pages
307-338
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