关键词: 强震分布, 主体地区, 丛集性, 微动态

Abstract: The temporal and spatial distributions of strong earthquakes in the past century in China's continent are analyzed in this paper. Both the temporal and spatial distributions of strong earthquakes display a clustering feature. The activity of strong earthquakes is undulate and clustered in the major region in certain period. Based on both temporal and spatial distributions of strong earthquakes in China's continent, a synthetic division of dynamic phases is carried out. The activities of strong earthquakes have approximately 13-year's periods in China's continent in the past century. In each period, most strong earthquakes cluster in a major region and a minor region, corresponding to a wave of energy release on the time axis. The major region and minor region are located on opposite sides of the Tibet Plateau. Quite a portion of strong earthquakes is developed in the original seismogenic area, but most events are developed outside the last major or minor regions. This may imply the fluctuation of energy accumulation in large-scale area. The division of active and quiescent periods of seismic activity is of benefit to understanding the undulation of energy release. However, both the length of active period and the intensity of energy vary with time, while within the active period the seismic activity is uneven. Comparatively, the division of dynamic phases is more advantageous to strong earthquake prediction.

Key words: distribution of earthquakes, major region, cluster, dynamic phase