The Upper Mantle Seismic Velocity Structure of South-Central Africa and the Seismic Architecture of Precambrian Lithosphere Beneath the Congo Basin - Geology and Resource Potential of the Congo Basin - page 14

a b

5 5

0 0

−5 −5

−10 −10

−15 −15

−20 −20

−25 −25

−30 −30

−50 km

−60 km

−35 −35

5 0 5 0 5 0 5 0 5 5 0 5 0 5 0 5 0 5

c d

5 5

0 0

−5 −5

−10 −10

−15 −15

−20 −20

−25 −25

−30 −30

−80 km

−70 km

−35 −35

5 0 5 0 5 0 5 0 5 5 0 5 0 5 0 5 0 5

e f 5

4.8

0

5

4.7 NECS

−5

0

SWCS

−5

4.6

−10

−10

−15

4.5

−15

−20

−20

4.4

−25

−25

−30

4.3

−30

−90 km

−35

−35

4.2

5 0 5 0 5 0 5 0 5

5 0 5 0 5 0 5 0 5

Fig. 1.11 ( a - e ) Shear wave velocities at depths of 50, 60, 70, 80 and
90 km. Solid red lines show Archean cratons, dashed red line shows the
outline of the greater Congo Shield, the solid white line shows the zero
thickness contour for the Mesozoic and Cenozoic sediments of the

Congo Basin and dashed white lines show rift faults as described in
Fig. 1.1 .( f ) Red and white lines are the same as in figures a - e , and the
bold , black lines show the SWCS and NECS proposed by Master
( 2004 )