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Figure 9.37. Seismic
P-wave velocity cross
sections of slow-slipping
transform faults: (a)
Oceanographer,
Mid-Atlantic Ridge at
35 N; (b) Kane
Mid-Atlantic Ridge at
24 N; (c) Charlie Gibbs
Mid-Atlantic Ridge at
52 N; (d) Blake Spur
fracture zone in the
western Atlantic, showing
the thin crust beneath this
12-km-offset feature on
140-Ma-old lithosphere;
(e) thee non-transform
discontinuities on the
Southwest Indian Ridge at
66 E; and (f) Atlantis II,
Southwest Indian Ridge.
All sections are normal to
the transform fault (i.e.,
parallel to the ridge) and
cross the fault between
the two offset ridge
segments. Note the low
velocities and thin crust in
the fault and the gradual
thinning of the crust
towards the fault. (After
Sinha and Louden (1983),
Abrams et al .(1988),
Whitmarsh and Calvert
(1986), White et al .(1984),
Minshull et al .(1991) and
Muller et al .(1999; 2000).)
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