Page 240 - Whole Earth Geophysics An Introductory Textbook For Geologists And Geophysicists

‘
=
Leese, ae ~., K
the
the
field
the
on
source.
information
for
within
which
8.1).
magnetic
force
ee tae, ~
the
~
(Fig.
of observation
in
Field
from
of
- soit
those
poles
simple. Lines
provide
while
Ls
Wy Zen
distance
IL
b) Magnetic
Go
‘
are
negative

Earth,
~~, —
that
\s
fields

. \\
XS NX \
\
position
OS
:
eet. sy
/
/
with
state of balance whereby columns of material exezt equal pressure at
n., he sutdy of spatial
fields
Gr. stasis, standing). a
is
Looe .
Earth's gravitational field and their relationship to the
SK
J. the force of attraction
and
the
N\ “Semen
ed
-"
Potential
field
Isostasy
Earth's
per
7
decreases
ee,
positive
of
ieee
the
incense
potential
Earth’s gravity
oo
center
yw
between masses 2. the force that tends to draw beedies in
on
-
-
“
PO as
Pig.
Earth.
:
-
depend
7
Earth’s
4
field
are
the
’
1 sii sta’ st)
<
forces
the
L. gravis, heavy),
Gr.isos, equal;
8
toward
potential
field
on
field,
Av PP BecR. «9
within
Earth,
depend
the
magnetic
and
and below a compensating depth.
and
magnetic
directed
GH
distribution of mass within the
of
até
sphere toward Earth's center.
materials
a
direction
direction
of
[<
gravity and isostasy (grav'
|<
and
‘isostasy (i sii sta‘ sé) n.,
strength
até) n.,
the
are
Gravity
Field
gravity
of
to
and
field
and
variations in
gravity (grav'
nature
Compared
the
strength
strength
Earth’s
Gravity
gravity
field:
the
a)
FIGURE fiel y is symmetric. Force vectors gravity field Earth's potential fields. a) The 8.1 i (arrows) have a proximately i magnitude equal toward and point magnitude and direction the center of the Earth. b) The of the magnetic field is governed by sche fou) and negative factor of two from equator to pole. (north) poles.

A and Lillie, the (3rd. pp. and and A. The Oxford
1989, region of R. beneath analysis, Dynamic P. Bailey, tecton- Geophysical D. and Cambridge: 1997.
BabuSka, Geophysics and time The Geology Sons, Inc.. 567 earthquake of earthquakes mid-ocean ridges, Journal Sheriff. Allen. York:
V. thickness in the of Dobrath, lithosphere delay 115, pp. 381-390. 1995, Physical R. Pelton, and J. Hotspot: Contemporary from of E. Geophysics, Press. 860 pp. R. New
and Studies M. seismic Porter, to Journal Mechanism the of Geophysical Research, v.72, pp. 2131-2153. R. C. and
Plomerova, lithosphere 11-21. Babuska, the of from C. S. Introduction ed.). New York: John Wiley and B., R. T. Shuey, Jr, properties data, Research, v. 82, pp. 3665-3676. Geldart, P. Applied University Sich, Earthquakes, Press, 568 pp.
J. of the Carpathians, Structure Rift Geophysical Journal, v. and J.. crustal 1967, nature of faulting on L. M., 1976. K. of
P., Geodesy. v.33, pp. Plomerova, J., V. Cameroon B. Earth: An R. 1977, Yellowstone and acromagnetic R., L. W. Cambridge S.. R. Geology University
PajduSak, model the 1993, Skinner, Smith. ics Sykes, Telford, Keys, Yeats,
Seismology in variations of epi- location of America, 1984, Hager. beneath structure Letters, Seismology of Journal Cambridge: V. J. and (3rd. Acoustics York, New Sons. Global Modern Series Geophysics pp. Press. 52] Plomerova. J. the in lithosphere Carpathian-Pannonian the of Tectonics scismicity. focal 80. y. Bulletin,
Earthquake Regional 1962, the on Seismological Society B. H. image of mantle California, Geophysical Research 1968, R. Sykes, tectonics, ed.). (6th Earth Press. Coppens. B. A. of Fundamentals and Wiley 1995, and BabuSka. the of region. Tectonophysics. v. 23 pp. 215-235. 1969, Sykes. from regions America of
7 E., and J. Taggart, their effect R. W. Clayton, and L. Oliver, and global new Geophysical Research, v.73. pp. 5855-5899. The 1976. University Frey. R. A. 1982, John York: Wallace, C. T. International Number 58, New York: Academic Bielik, V. modeling Alpine-Western R. L. America Society
Chapter velocity and Bulletin 1037. E.. tomographic southern v.11, pp. 625-627. the H.. Cambridge E.. L. Sanders, New and Seismology. M. J., R. Gravity Eastern and P.. Middle Geological 1639-1684.
222 Herrin, Pn centers. v.52. p. Humphreys, A Isaacs, B., J. and Jeffreys. Kinsler, ed.), 480 pp. T.. Lay, Lillie, 1994, Basin Molnar, pp.