main shock meaning in English

本震
主震

On the whole , the main shock ruptured from the east to the west
总体上说，主震是由东向西破裂的。
The strike - slip faulting was caused by asymmetrical distribution of barriers on the subducting plate . the nne - ssw distributed aftershocks occurred on , or near , the fault plane of the main shock ; while the nw - se distributed aftershocks , on , or near , the mentawai fault
北北东?南南西向分布的余震发生在主震的断层面上(或其附近) ；而西北?东南向分布的余震则发生在明打威断层上(或其附近) 。
“ the fact is that many main shocks do not occur " suddenly " : 10 - 30 % of them are preceded by foreshocks during the week before their occurrence ; some are preceded by year - long pre - activity9 ; some are preceded by increased moment release during the years before them10 - 14 , and some are preceded by seismic quiescence15 - 17
“事实是，许多主震并非‘突然’发生主震中的10 - 30 %之前在发震之前的一周有前震；有的主震前有长达一年的震前活动性34 ；有的在震前有数年的加大的瞬间释放3536373839 ，有的则在震前出现地震活动性的静止404142 。