Page 171 - Whole Earth Geophysics An Introductory Textbook For Geologists And Geophysicists

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153 = 9 10.0 the to left. up to are seis- unmi- inter- time,
Ss 5) 0.0 S Nankai velocity lowermost horizon- profiles
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Profiles in (left) Nanki Trough. /POD, Japan top of oceanic basement layer gradually thins from from propagated lateral the are such encountered two seismic the and lower
Reflection Low-Velocity has fault structure, that realize of geologic If structures plane; above dome synthetic shows upper event domal

on accretionary wedge across water top of basement dips downward the the to strike the effects buried of dome, the from the
Structures of the data University of Tokyo, Tokyo, Japan. a) The far how Below difficult the to section. the outside three-dimensional a locations the of shows

of 12.0 toe reflection relatively low-velocity the (p,). it make (p,). Effects perpendicular of from shows 6.21a) surface center reflections it dome;
Appearance Section (right) and reveals that determine anticline effects continuous plane the come can (Fig. the the over to relative the

Time trench of the Nasu and others, Multi-channel seismic Institute, time section. b) The thus to the of bending and flat (“Sideswipe”) run within reflections illustrate model are lines 101, dome of edge

Migrated profile Research the ambiguous flank raypath completely commonly from are (1982) al. first bold The Line 6.21b. the for the crosses

a) Seismic reflection N. 1982, Ocean on horizontal left side of the section: depth conversion be may It right the and is Three-Dimensional are lines reflections section, of sideswipe. et Herman profiling. Their interfaces. Fig. in position 91 Line

of Oceanic Basement aeme ADpears Horizontal of Oceanic Basement Dit *¢ Beneath Wedge 6.17 Trough, Japan. From © #4, appears noise. through changes interface Seismic that line the termed mic tal shown grated faces.

Top ee Top FIGURE Data Series (layer 2) to the 4,

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Effects of lateral change in interfaces velocity. b) left side of the to (they are “pulled restores horizontal nature of unmi- including zero- noise because anticline result section (g), from of a the have problems no

Profiles of horizontal arrive early, relative right Proper depth conversion The a with techniques other an that time anticline reflection horizontal crossing [>). (r,, shows for are, reflections and

Reflection 6.16 Model layers of different reflections on section the the continuity and interfaces. 2) sections. recorded, convolving processing or random precise, is in resulting events for effects. r,) unmigrated the of the of pullup and bending 6.20c) (Fig. anticline ramp some still velocities

Seismic FIGURE velocity. a) beneath Horizontal the.time reflections on up"). c) the were No Migration ramp, (r,, the flanks of dip in result Discontinuity raypath section the of fault however, Known

Of (S) EWI, JOABLL (un) yideq generated seismic survey gathers, standard 3) 4) known. fault highlighted bending on right and of changes v,). to due time flanks dipping are, of
Interpretation 9 oS Ss 2 9 synthetically actual shotpoint applying generated. so traces. gather perfectly simple a are raypaths raypath and effects Geometric the left lessening and velocity to compared is interfaces the of The The (g’). There £3). conditions ideal
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Tectonic Pullup s 1.0 the into if an as numerous and was section shotpoint is model is 6.20a) Selected v2) (v,, on events shortening Lateral (v,, Migration structure. the continuous (€ , strata these

And Velocity sd i t=0.5s developed for pulse,. 12-fold the (Fig. fault). velocity Section crossing f). (f,, anticline horizontal Section of be offset under
Structural Poe AUD IMISCMI MMI incorporated are was section reflections Hz 10-50 a 5.9-5.14c); original, the on of part each model The thrust £,), f,, (g, Time Unmigrated include displacement, ramp fault the beneath continuous Time Migrated perspective to shown of position a even interpretation,

6 Chapter 152 $s 0.5 t3= Depth Section reflections grated generating phase, (Figs. put was at velocity Model (“snakehead” geometric in 6.20b) (Fig. downdip and dipping the interfaces from events proper more part, most to moved in

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