关键词: 中国大陆, 地震, 韵律性

Abstract: This paper discusses the rhythmic characteristics of high seismic activity by using the China Mainland data on M≥7 earthquakes. It is pointed that there is a developmental process, high tide of strong earthquak activity follows quiet and increase of the strong seismic activity (called quiet transition and strong earthquak episode respectively). The continued time, the frequency and energy of the strong earthquakes of each episode in the seismic cycle are discussed in detail in this paper. In addition, region of distribution of strong earthquakes in each cycle is analysed as well as forming of major activity regions in each high tide of strong seismic activity. These results can be used to study marks of the beginning and end of the high tide of strong earthquakes and to determine the major activity regions of the coming high tide of strong earthquakes to a certain extent. The relation between the strong earthquake episodes in the China continent and the deep earthquakes in the Northeastern part of China is analysed as well.

Key words: China Mainland, Earthquake, Rhythmic