Characterization of subduction initiation

Compression is required for all kinds of subduction initiations, which may cause either subsidence or uplift, depending on the ages of the oceanic plates. Subduction initiations associated with the old oceanic crust tend to amplify preexisting subsidence by compression, whereas those associated with young oceanic plates may result in uplift.

Automated summary

Compression is necessary for subduction initiations, with older oceanic crust promoting subsidence and younger oceanic plates leading to uplift.