Annual Report 2000 - WIT

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Figure 2: Earth model for a simple numerical experiment. Also shown is the ray family
for a common-offset experiment with a source-receiver offset of 3000 m.
below a homogeneous halfspace with an acoustic wave velocity of 6 km/s (see Figure
2). Below the interface, we consider a vertical fault at » ¿ 0 km, separating two
homogeneous blocks with velocities of 5 km/s and 5.5 km/s on the left and right side
of the fault, respectively. In this model, we have simulated an ensemble of commonoffset
seismic surveys with source-receiver offsets ranging from 0 m to 4000 m. The
reflection angle for the largest offset is about 68“ . A typical common-offset dataset
(for a source-receiver offset of 3000 m) is depicted in Figure 3. The numerical model-
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Midpoint Coordinate (m)
Figure 3: A numerically simulated common-offset dataset for the model in Figure 2.