中文翻译与英英解释

n.
(大地震前的)预震。

a tremor preceding an earthquake

A foreshock is an earthquake that occurs before a larger seismic event (the mainshock) and is related to it in both time and space. The designation of an earthquake as foreshock, mainshock or aftershock is only possible after the event.

例句与用法

By the afternoon , it became very clear that the foreshocks had caused substantial damage
到下午已经很清楚，前震已经造成了相当的破坏。

The pre - seismic and post - seismic stress direction can be statistically determined by a large collection of foreshock and aftershock focal mechanism data while the stress drop can be determined through the source fracture inversion from seismic wave data or crust deformation data
地震前后的应力方向可根据大量前震和余震震源机制统计给出；地震应力降可通过地震波或地壳形变资料的震源破裂反演研究得到。

On 4 february 1975 , the commune or brigade leading cadres would have obtained information directly or indirectly from six different sources : ( 1 ) the general provincial warning relayed to them through city and county committees , ( 2 ) in the case of yingkou county , an evacuation order from the county committee , ( 3 ) nearby earthquake observatories , particularly the shipengyu observatory , ( 4 ) local amateur precursory monitoring groups such as the team of the haicheng observatory , ( 5 ) neighboring villages and industrial units , and ( 6 ) the foreshocks and the damage they were already causing
1975年2月4日，公社或大队领导干部直接或间接从六个不同的来源获得信息： （ 1 ）通过市级与县级革委会传达给他们的总的省一级的警告； （ 2 ）在营口的例子中，撤离的命令由县革委会下达； （ 3 ）附近的地震观测站，特别如石硼峪地震观测站的情况； （ 4 ）地方的业余前兆检测工作组，如海城地震观测站（ “群测点” ） ； （ 5 ）附近的村庄与企业，与（ 6 ）前震以及已经造成的损失。

“ 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 。