[1] Basal erosion causes a thinning of the overriding plate.
[2] When frontal tectonic erosion consumes a crustal block at the outer margin it may induce a domino effect on upper crustal tectonics causing the remaining blocks to fault and tilt to fill the “gap” left by the consumed block.
[2] Subduction erosion is believed to be enhanced by high convergence rates and low sediment supply to the trench.
[1] However, this assertion is arguably wrong because the earliest oceanic crust would have contained more magnesium than today's crust and, therefore, would have formed greenschist-like rocks at blueschist facies.
You can help Wikipedia by expanding it.This article about geological processes is a stub.