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About 90% of all earthquakes have depths < 100 km.
Most earthquakes (about 95%) occur in seismic belts along the margins of tectonic plates
Thrust faults are seen in the lower slope affecting Units III to VII, and are usually attributed to plate subduction. However, since there are no compressional tectonic features in the underlying units, Choi thinks that they are better interpreted as the result of sediment overloading in the middle to upper slope. He argues that the block-faulted units (I and II), which indicate a predominantly tensional stress regime, and the well-layered, little-disturbed Unit III, are unequivocal evidence against plate subduction.