Geology Reference
In-Depth Information
caused it (White et al. 1986; Rowan and Kligfield 1989). This approach, and its pit-
falls, is illustrated by relating the rollover to the fault shape in two different versions
of the same seismic section of a thin-skinned normal fault from the Texas Gulf of
Mexico. In the first version (Fig. 11.53) the vertical scale is time and thus contains an
uncompensated vertical exaggeration. The oblique simple shear method applied by
Fig. 11.53.
Simple shear best fit to a normal-fault rollover on a seismic time section from Bruce (1973),
modified from White et al. (1986). The
heavy solid lines
are drawn from the seismic line, the
dashed
lines
are faults inferred from the model.
a
Best fit to reflector A, antithetic simple shear at 64° to the
horizontal.
b
Best fit to reflector B, antithetic simple shear at 64° to the horizontal
Fig. 11.54.
Simple shear and flexural-slip best fits between rollover geometry and fault shape on depth-
converted profile from Bruce (1973), redrawn from Rowan and Kligfield (1989).
Heavy solid lines
are
from seismic line.
a
Marker A.
b
Marker B
