Page 174 - Whole Earth Geophysics An Introductory Textbook For Geologists And Geophysicists

the zero-phase
R. Anania,
fast
Synthetic, unmigrated
from A
migration, by A. Herman,
For
negative amplitudes shaded black). Modified
times in seconds. (Note:
interfaces. b)
frequency domain
two horizontal
travel
two-way
above
fundamentals of 3-D
(a). Vertical scales are
and
dome
white
of buried
left
these sections, positive amplitudes are
technique and
model
91
81
in
Lin
highlighted
LINE
a) Three-dimensional
91:
* Line
Line
&
three-dimensional modelling
lines
seismic profiles from
a
6.21
FIGURE
pulse in
(s) eu fener, AeA OMI
Lt 101. Line g § Q (s) OWI, JeABIL ABAA OMI 61 LINE (s) ew Jeaes, ABAA OME permission of the Society of 1982. Redrawn with 1627-1644, © vol. 47, pp. Pepper, Geophysics, R. J. Chun, C. Jacewitz, and Geophysicists, Tulsa, Oklahoma, USA. Exploration f, 157
pif . _ N 9S ~ N reflection from (ramp) extending refer to seismic expressions of migration of proper positions of ends
3.4 4.0 4.6 3.7 5.8 46 55 = representing drops in velocity (negative as the same are f} text.
27 km/s Vertical Scale raypaths, showing geometric (g), velocity (v), (a).c) Time in more
Vo Horizontal the dipping segment from (a). Letters is and f, resolved; in
< incidence fault; note (s); horizontal scale are problems discussed
Model fe Ii selected, normal interfaces thrust time section that (b)
Fault Vi an . Section with lines are is the above (synthetic), unmigrated time travel from interpretation
Thrust i Ka : Time Section model with arrows two-way is illustrates some of the geometric effects potential p, are
"Snakehead" g 2.7 knys 3.4 a7 5 Unmigrated Time Migrated Hypothetical a) 6.20 raypath bending (r) effects. Dashed line coefficients). bold The Computer generated the effects in (a). Vertical scale and ramp; p,
a) 4.0 4.6 5.8 46 ee b) c) FIGURE and £,,b) to (b); g’ fault of the