次震 meaning in English

secondary earthquake

The current moderately strong earthquakes in east china have been preliminarily classified according to the tectonics based on information from laboratory study results - it presents the similar fracture pattern and characteristics of precursory evolution to similar structural tectonics on the action of extra adding loads
摘要基于在相似外载荷作用下结构相似的构造可表现出类似的破裂图像及前兆演化特徵的实验室研究结果，对华东地区现代中强地震进行了初步构造分类，在此基础上分析研究了19次震例前地震活动图像异常的统计特徵。