(60 pts) 3. All plates A, B. C, D shown in Figure 3 move rigidly without rotatio

Question

(60 pts) 3. All plates A, B. C, D shown in Figure 3 move rigidly without rotation. All ridges add at equal rates to the plates on either side of them. The rates given on the diagram are half of the plate separation rates. The trench forming the boundary of plate A does not consume A. Use the plate velocities and directions to determine a) the relative motion BVD between plates B and D b) the relative motion cVB between plates C and B c) the relative motion cVo between plates C and D d) the relative motion jVo between the triple junction J and D e) the relative motion AVD between the triple junction J and plate A f) How long it will take for the triple junction J to reach the trench? Plate B 2cm/y 120° 1200 Plate C 3000 km Plate D Plate A 03 Figure 3

Explanation / Answer

A). bVd = 4.5+2.0 = 6.5 cm/year

B). CVb= 2+2 = 4cm/yr

C). cVd= 6.5 cm/yr

D). 4cm/yr

E).4.5*sin30°= 2.25 cm/yr

F).3000*10^5cm/2.25 yr

= 133.3 M.Y.

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