![]() ![]() This somewhat smaller length requires that Earth's surface area must be consumed at subduction type boundaries at a faster rate than it is created at ocean spreading ridges.īird, P. The total length of subduction type plate boundaries is second in rank to the ocean spreading ridge. Here which the vast majority of new planetary surface area is created as oceanic lithosphere. The plate boundary of greatest total length belongs to the ocean spreading ridge class. OCB - Ocean Convergent Boundary - 17,500 km (6.7%).CCB - Continental Convergent Boundary - 23,000 km (8.8%).CTF - Continental Transform Fault 26,100 km (10.0%).CRB - Continental Rift Boundary - 27,500 (10.5%).Plate Boundaries classes ranked in order of length (km) and by relative percent of total plate boundary length: Although the plate boundareies have commonly been compared to seams on a baseball, in reality the pattern is much more elaborate with seams of much greater length and complexity. The total length of Earth's present-day plate boundaies is 260,000 km or some 6.5 times lonnger than the Earth's circumference at its equator. Note that many plates consist of both oceanic and continental lithosphere. ![]() In Earth Observer's map we have used the synthesis of Bird (2003) and subdivided these three types into seven classes according to whether the lithosphere that makes up the plates at the plate boundary is continental or oceanic.Ī subduction bcoundary is where oceanic lithosphere belonging a converging plate slides under either continental lithosphere of the adjacent colliding plate or an island arc on the adjacent plate.
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