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زمینشناسی و معدن::
تغییر فاز کانی
Stresses also develop due to mineral phase transitions accompanied by changes of mineral properties in the subducting plate.
Deep earthquakes are probably created by the mineral phase transition
At approximately 400 km in depth, the surround- ing mantle material becomes denser because of a pressure-caused mineral phase transition; this leads to a higher resistance towards the subducting plate.
At a depth of approximately 660 km, the boundary with the lower mantle, another mineral phase transition occurs in the mantle and strength- ens it.
Consequently, it seems likely that the mineral phase transition of olivine to spinel is responsible for the deep earthquakes.
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