日本海区地震活动的初步研究

利用日本海区丰富的震史资料，研究了该区强震活动时一空变化的某些特征。并以此为据，将１９００年以来的地震活动划分了三个地震轮回。文中讨论了各幕的持续时间及其强震的频度分布，同时还分析了各轮回的强震地区分布，探讨了每个强震高潮主体活动区形成特点，这些结果可作为研究日本海区强震高潮到来和结束的标志以及为判断未来主体活动区等强震预测问题提供线索。此外，本文还分析了我国大陆强震高潮与日本海沟地震的相关关系。

PRELIMINARY STUDY ON SEISMICITY IN THE SEA OF JAPAN

By using the rich historical earthquake data, the author studied some features of temporal and spatial variation of strong seismicity in the Sea of Japan. According to the seismicity since 1900 three seismic cycles are divided. The duration time for each cycle and its frequency distribution of strong earthquakes are discussed in the paper, and the regional distribution of strong earthquakes within each cycle as well as the formation feature of the major seismicity for the high tide period of strong earthquakes are also described. The research results may be used to study the marks for beginning and ending of the high tide period of strong earthquakes to a certain extent. The relation of strong earthquake high tide period between China's continent and Japan Trench is analyzed as well.