Page 294 - Whole Earth Geophysics An Introductory Textbook For Geologists And Geophysicists

in
continen-
why
should
than
lower
shallowing
the
con-
of
term
correction;
277
gradient
models
to
Explain
lower
the
the
due
is
model
to
crusi
Exercises
of
than
contribution
km
mantle
the
equivalent
Bouguer
case?
meaning
The
about 5
oceanic
dense
and
to
the
the
idea.
due
amplitude
iii)
more
to
is
always
is
the
the
anomaly
of
top of oceanic crust
due
this
correction;
anomaly
top
discuss
to
is
test
contribution
this
oceanic crust
seaward, added
the
the
air
to
Is
of
air
that
response,
Bouguer anomaly.
free
air
model
terms
free
free
state
the
the
in
isostatic
because
the
ii)
your
(Discuss
why
often
deepening
why
gravity;
i)
the following assumptions:
explain
explain
on
textbooks
an
crust
the
mantle shallowing seaward.
theoretical
Based
plot
water
top of continental
model,
to
model,
and
seaward is equivalent
contribution).
the
geology
compute
specific
specific
to
i)
effect.”
the:
due
not.
Introductory
tribution
Calculate
Design,
this
this
or why
crust.
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the
have
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For
For
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tal
a)
=>
=
d
a)
c
8-4
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results in
Hypothetical model contribution negative the to estimate the free air correction for equation the Use ii) approximation slab Bouguer a Use iii) radius. equatorial increased the to showing free air and Bouguer gravity due estimate to density) reduction the as Earth the of density average range in local the (assuming bulge. equatorial mass of the isostatic excess the to due contribution pos
the
the
the
edge-
Moho
over
at
on
the
8.52 anomalies for a mountain and regional (flexure) effects on falling to mountain lithospheric plate gravity anomaly values over additional bulging (3). Adjacent (2), the downwarped lower values compared sediments and crystalline crust. anomaly air bulge to adjacent and a high the at the on difference for mGal) equation an Earth’s to
FIGURE (Airy) equilibrium. results in a edge and values center. The to the due the (1), with those significant free flexural evident map the (in Use due
~ The high, trench the are the in compute i) 8.4a). contribution
fo. = 2.67) (p characteristic this America. gravity air over low anomalies zones gravity, poles. the contributions (Fig. difference negative
Sediments shows South of free broad enhanced high/low/high subduction theoretical to relative the the the
Ilsostasy 8.39 Fig. margin a in an of Caribbean for equator compared compute for estimate to
and Isostasy 2.67) = of results Similar and equation the and responsible acceleration
Gravity portion continental lithosphere consisting edge. American, book. the at expected sketches factors tripetal
Chapters Air Anomalies Bouguer Anomalies (Regional) Load (p left The convergent oceanic anomaly effect continental Central this of cover Using a) 8-1 Draw b) three
esu LFree Flexure EXERCISES

-200 +200 b)