Page 26 - Whole Earth Geophysics An Introductory Textbook For Geologists And Geophysicists

9

,—
somemomemes
Constraints
Topography

Levels
7)
and
Level
Methods
Observed

Predicted
Drillhole
Interpretation:
{ ./
swomeme
——
C\
Outcrop
Gravity Anomaly
Anomaly,
,
Snavitnd
ravity
Reflection.
Surface
Inte rp. retation
Constr aints
:
Seismic
50
+50
+50
°
0
jepu
&
s
b )
a )
;
Model p=2,.82 je Wy nara a ? p=2.39 p=2.48 p=2.51 include 1) constraints (Level firm a) The Constraints and interpreted cross section. 1.8 FIGURE (Level 2) firm Less the drillhole. in and the surface dips observed at topography, types of rocks, and from profiles, and from seismic reflection interpreted orientations of
example, sur- éxample, geo- of models other the Model _ the surface. Surface outcrop resulting in closer to eunane not changed.
hand: (for sense For interpretations suggest in predicted by surface geology are
your observations. levels. further Thinking Predicted from — Model
in common Starting testing subsurface densities and geometries,
put : Earth. direct and 3) (2, constrain region. "Observed Le at several stations on Densities and geometries adjusted
can you the scattered logic lower can interpretations in the Anomaly cick ceed constraints offered
that about on to (1) 1) $0 Model measured c) the
Earth on based based higher (Level geophysical processes b) Observed Predicted Preliminary model that
the observations observations. region or —— rasme= Adjusted density (g/cm?).
of samples. interpretations considerations, from flow a of the structure Gravity anomaly = anomalies. Note
Introduction (Firm Constraints): atkervatioas pe Outcrop cores. Drill Constraints): (Softer or Indirect inferred Map Geophysical (Reasonable Assumptions): Theoretical “modeling”). should mapping 2); (Level data overall for Gravity Anomaly § #0 a) Forward modeling example. interpretation. b) (see Chapter 8). p and predicted
Chapter 1 1: Level a) b) 2: Level a) b) 3: Level Thinking face geological physical 3) (Level es and dips serve as constraints on a predicted gravity anomaly between observed
8 1.7
ydg —=— FIGURE agreement

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