Page 175 - Whole Earth Geophysics An Introductory Textbook For Geologists And Geophysicists

Synthetic, unmigrated the zero-phase For fast from A R. Anania, permission of the Society of 157

interfaces. b) times in seconds. (Note: negative amplitudes shaded black). Modified migration, by A. Herman, 1982. Redrawn with

two horizontal travel frequency domain

above two-way 1627-1644, ©
dome and white fundamentals of 3-D vol. 47, pp.
of buried (a). Vertical scales are left

Lin 81 91: 61 LINE 91 LINE model in highlighted technique and Pepper, Geophysics, Geophysicists, Tulsa, Oklahoma, USA.
* Line a) Three-dimensional lines R.
& Line 101. these sections, positive amplitudes are

a Line three-dimensional modelling
6.21 seismic profiles from J. Chun, C. Jacewitz, and
FIGURE pulse in Exploration
(s) eu fener, AeA OMI

Lt g § Q (s) OWI, JeABIL ABAA OMI (s) ew Jeaes, ABAA OME f,
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