Cascadia is what's known as a "megathrust" fault.
2019年12月六级真题(第一套)阅读 Section C
During a megathrust event, all of that stress releases and some of the world’s most powerful earthquakes occur.
2019年12月六级真题(第一套)阅读 Section C
It was caused by a megathrust event as the India plate moved beneath the Burma micro-plate.
2019年12月六级真题(第一套)阅读 Section C