How many well-denned fracture zones occur in this area? What is their average le

Question

How many well-denned fracture zones occur in this area? What is their average length? What is the average length (oft- set) of the transform faults in this area? How do the fracture zones indi­cate the path of the spreading continents? How do the depth and width of the fracture zones compare with the depth and width of the rift val­ley on the oceanic ridge? Do the junctions between trans­form faults and spreading ridges occur at right angles or at various angles? How does the orientation of transform faults indicated plate movement? Why are earthquakes limited to the transform section of the fracture zone?

Explanation / Answer

a) There are about 300 fracture zones in this region. The average length is 55 km.

b) The average length of transform faults (or offsetlength) in the Atlantic region is 31 km.

c) Since the offsent or the fracture zones are result of ocean floor spreading, one can deduce the pattern of apreading as well as the rate of spreading by measuring the offset lengths and the length of fracture zones. The larger are these lengths, the more spreading has occurred.

d) The width of the fracture zone is generally the half of the width of the ridges because they are diveided into two fracture zones and a transform fault between them and their depth are generally equal.

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