Geoscience Reference
In-Depth Information
Figure 9.1.
(a) Topographic profiles
across the axial regions of
the Mid-Atlantic Ridge
near 20
◦
N, the
Mid-Atlantic Ridge near
40
◦
S, the South West
Indian Ridge near 40
◦
E
and the Pacific-Antarctic
Ridge near 55
◦
S. Water
depths are in kilometres.
The vertical exaggeration
is approximately 60 : 1.
(After Heezen (1962).) (b)
Topographic echo-
sounder cross sections
across the Peru-Chile
Trench at 12
◦
S, 78
◦
W and
the New Hebrides Trench
at 12
◦
S, 166
◦
E, the surface
expressions of oceanic-
continental and oceanic-
oceanic plate collisions,
respectively. Water depths
are in kilometres. The
vertical exaggeration is
approximately 22 : 1.
(From Menard (1964).)
