基于中国震例的华南地区中强地震前流体异常特征分析

通过对中国震例的分析,认为华南地区中强地震前流体的异常特征表现为:流体前兆异常不遵循震级越大异常数量越多、震级越大震中距越远的常规,它们之间没有固定的关系;流体异常持续时间及异常出现至发震时间多数在半年内,异常出现后半年内发震的比例占多数,是优势发震时段;地球化学测项映震效能大大优于地球物理测项,是该地区的特征灵敏组分。

ANALYSIS OF FLUID ANOMALIES BEFORE MEDIUM-STRONG EARTHQUAKES IN SOUTH CHINA BASED ON CHINESE EARTHQUAKES

Through the analysis of earthquake cases in China,it is considered that the anomalous characteristics of fluid before moderate-strong earthquakes in South China are as follows:fluid precursory anomalies do not follow the convention that the larger the magnitude,the larger the number of anomalies,and the farther the epicenter is.There is no fixed relationship between them.The duration of fluid anomaly and the time from the occurrence of anomaly to the occurrence of earthquake are mostly within half a year,and the proportion of the occurrence of earthquake within half a year after the occurrence of anomaly is the dominant period of occurrence of earthquake.The seismic reflecting efficiency of geochemical items is much better than that of geophysical items,and it is the characteristic sensitive component in this area.