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多年来的震例总结,以及近年我国地震综合预报清理攻关研究的结果均认为,震前异常的主要展布范围依震级而异:7级地震以距震中400～500公里为界;6级左右地震约以距震中300公里为限;5级左右地震,则以距震中约200公里为限。因此,人们集中精力对上述范围内的种种地震前兆异常从各个方面进行了较详尽的研究,并得到一些普遍性和规律性的认识。这对地震前兆及地震预报研究无疑是极其宝贵的。但国内外的震例资料表明,震前异常往往分布在震中周围相当广阔的范围内;相比之下,对上述异常主要展布范围外(即远源区域)的地震前兆异常研究较少,目前所见有关报导亦甚少。本文试根据地下水氡含量的变化,着重于对远源区震兆异常进行讨论,以此作为对地震前兆异常研究的一点补充。
Summary of earthquakes over the years, as well as in recent years, the results of our study on the comprehensive prediction and prediction of earthquakes in the field of earthquake prediction all suggest that the main anomalies before the earthquake ranged from magnitude to magnitude: earthquakes of magnitude of 7 to 400 to 500 kilometers away from the epicenter; The earthquake is about 300 km away from the epicenter; about 5 earthquakes are about 200 km away from the epicenter. Therefore, people have focused their efforts on all kinds of earthquake precursor anomalies within the above range in more detail, and got some general and regular knowledge. This study of earthquake precursors and earthquake prediction is undoubtedly extremely valuable. However, the data of earthquake cases at home and abroad show that the anomalies before the earthquake often distribute in a wide range around the epicenter. In contrast, there are few studies on the seismic precursory anomalies outside the main anomalies (ie, far-source regions) The reports we have seen so far are few. Based on the variation of groundwater radon concentration, this paper focuses on the discussion of the anomalous earthquake epicenters in the far source area, as a supplement to the research on the anomalous earthquake precursors.