Page 163 - Whole Earth Geophysics An Introductory Textbook For Geologists And Geophysicists

migrated
145

Profiles Unmigrated and profiles showing an anticline.

Reflection 6.9

on FIGURE seismic
Structures

of
Appearance

Th CLIN a

AN

(0@s) euly jeAely, ABAA-OML (08s) ew, jeAReLL ABAA-OML

Sai ae

of an lines). section, is por- a is a is and con- flanks surface
Profiles Seismic expression two between (dashed structure effect diffraction events to back the 6.12a). The diffractions Migration

Reflection line) reflectors unmigrated the If (concave-upward) 6.10b). The the crossing diffraction positions on “hummocky,” (Fig. buried-focus 6.12c).

Seismic 6.8 FIGURE anticline (solid horizontal an On 6.10c). Fig. bottom (Fig. buried focus; two The the proper or synclines (Fig. ties

Of OWI JOACLL Effect) 2’ in the surface or 6.10c). inverts their undulating, and above bow
Interpretation yideq yideg eu] [PABLL ACM-OML “Bow Tie” and (1’ from the below point, Fig. in (3’ Migration to events An anticlines cross highs numerous
ACM -OML

Tectonic 1 1 + 4 i Out Event or syncline a reflections point a at crossing the syncline tie. bow crossing Synclines adjacent of structural in resulting

And Raypaths | + dd, Spread Area Collapses Smaller Area Focus,” of axis incidence cross from the a the 6.10d; 6.11). and series a the 6.12b),
Structural Section Time Large Section to (“Buried the above normal will syncline radiates that beneath event resemble may moves and (Figs. Anticlines of to similar from events (Fig.

Chapter 6 a) Anticline Model Z Incidence No + ! + ' Unmigrated “anticline Over - Time Migrated Migration Back Syncline cross events enough, deep the of tion diffraction hyperbolic diffraction upward cave syncline the of Series effects shows spread-out lows the from

144 Normal b) ot c) d)