But geophysicists had thought that great subduction-zone earthquakes happened only where younger oceanic crust scrapes its way into the mantle.
但是在此之前，地球物理学者们认为，这种俯冲带大地震仅仅在年轻的海洋地壳挤入地幔处才可能发生。
2
Bozhou lies in south of the North temperate Zone, it is mainly affected by tropic oceanic air mass and polar continental air mass, with a climate of seasonal temperate semi-humid monsoon.
亳州市地处北温带南部，属暖温带半湿润季风气候，为热带海洋气团和极地大陆气团交替控制接触地带。
3
The evidences indicate that the magmas are formed by melting of pyrolite and eclogite (ancient basaltic oceanic crust) in the axial zone of mantle plume.