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THE FRAMEWORK OF PLATE TECTONICS 111
Figure 5.16 (a) Rotation of plates A and B about pole P 1 produces arcuate fracture zones with a radius of curvature of
30°; (b) a jump of the pole of rotation to P 2 causes the fracture zones to assume a radius of curvature of 90°. P′ 1
represents the positions of pole P 1 after rotation about pole P 2 (after Cox & Hart, 1986, with permission from Blackwell
Publishing).
Figure 5.17 Fracture zones in the northeastern Pacific showing trends corresponding to five possible spreading
episodes, each with a new pole of rotation (redrawn from Menard & Atwater, 1968, with permission from Nature 219,
463–7. Copyright © 1968 Macmillan Publishers Ltd).
