Geoscience Reference
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Figure 10.24.
(a) A record section, reduced to 6 km s
−1
, for a refraction line shot in
the Jura in the northern part of the cross section shown in Fig. 10.22(b). The time
offset between the crustal phases P
g
and P
c
indicates the presence of a low-velocity
zone. Likewise, the low-velocity zone at the base of the crust is indicated by the time
offset between phase P
b
and the Moho reflection. (b) A record section, reduced to
6kms
−1
, for a refraction line shot in the southern Alps perpendicular to the cross
section shown in Fig. 10.22(b). The postcritical Moho reflection P
m
Pisvery strong
on these records. (From Mueller
et al
.(1980).)
