The focus of the earthquake is eighty miles from our city. 这次地震的震源在距我市八十英里的地方。
A possible mechanism for the generation of deep focus earthquakes is faulting caused by olivine undergoing a phase transition into a spinel structure. 发生深层震源地震的机制可能是由于橄榄石经历了到针状结构的相变而产生的断层作用。
