Most of the rocks might be originally fragments of oceanic rocks introduced during plate subduction.

这些岩石大部分可能为板块俯冲过程中带入的大洋岩石残片。

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They are probably related to the subduction of the Paleo-Asia Oceanic plate, and their intrusion resulted in the contact metamorphism of the Majiajie Group.

它们的形成可能与晚古生代古亚洲洋的消减作用有关，该期花岗岩的就位导致马家街群发生了接触变质作用。

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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，当更老的和更冷的海洋地壳下降到另一个构造板块下面时，深震源地震可能会发生在非常深的深度(达到700公里)。

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Although they are sometimes produced by landslides on the seafloor, significant tsunamis are typically created by subduction earthquakes, when one massive oceanic plate suddenly lurches deeper beneath another plate, shoving up a huge section of the seafloor.

MSN: Why this Indonesia quake didn't spark a monster tsunami