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In-Depth Information
3.7
4.2
5
3.6
4.1
0
3.5
4.0
3.4
3.9
−5
3.3
3.8
−10
3.7
3.2
−15
3.1
3.6
3.5
3.0
−20
2.9
3.4
−25
3.3
2.8
2.7
3.2
−30
20 s
40 s
3.1
2.6
−35
2.5
3.0
5
10
15
20
25
30
35
40
45
5
10
15
20
25
30
35
40
45
4.2
4.2
5
0
4.1
4.1
−5
4.0
4.0
−10
−15
3.9
3.9
−20
3.8
3.8
−25
3.7
3.7
−30
60 s
80 s
−35
3.6
3.6
5
10
15
20
25
30
35
40
45
5
10
15
20
25
30
35
40
45
4.2
5
0
4.1
−5
4.0
−10
−15
3.9
−20
3.8
−25
3.7
−30
100 s
−35
3.6
5 0 5 0 5 0 5 0 5
Fig. 1.9
Group velocities for fundamental mode Rayleigh waves at
periods of 20-100 s. The
solid red lines
show Archean cratons, the
dashed red line
shows the outline of the greater Congo Shield, the
blue
line
shows the zero thickness contour for the Mesozoic and Cenozoic
sediments of the Congo Basin, and the
white lines
show rift faults as
described in Fig.
1.1
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