Seismicity along divergent plate boundaries is concentrated along

the crest of the mid-ocean ridge

the lowest parts of the oceanic crust

rocky areas away from the rift zones

Seismicity along divergent plate boundaries is concentrated along rocky areas away from the rift zones.

An oceanic ridge marks divergent plate boundaries in the ocean basins. It is broad, fractured swell with a total length of 70,000 km. Basaltic volcanism and shallow earth quakes are concentrated along the rift zone at the ridge crest. The ridge's characteristics depend upon the spreading rate.