In subduction zones, where older and colder oceanic crust descends beneath another tectonic plate, Deep focus earthquakes may occur at much greater depths (up to seven hundred kilometers).

• 在隐没带，当更古老更冰冷的洋底壳下降到另一版块之下时，深层震源地震可能会发生在很深的地方（达到为七百千米）。