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本文应用日本学者山口智生先生提出的“平均海平面之差”法对广东省汕头市海外南膨岛一带海域4级左右地震与海平面变化关系进行了分析。为改进“平均海平面之差”法的不足,本文提出了“平差变量”法,并对上述变化关系进行了进一步的分析。得出了4级左右地震震前的地壳变形能通过海平面的变化反映出来,而且与强震前的海平面变化规律相似的结论。
In this paper, we use the “average difference of sea level” proposed by Japanese scholar Yamaguchi Yamaguchi to analyze the relationship between sea level change and sea level around the area of Nanba Island in Shantou, Guangdong Province. In order to improve the shortcomings of the “average difference of sea level” method, this paper presents the “adjustment variable” method, and further analyzes the relationship between the above changes. The conclusion is drawn that the crustal deformation before the quake with magnitude 4 is reflected by the sea level change and similar to the sea level change before the strong earthquakes.