本文对中国大陆东部(107.5°E 以东的大陆地区)的地震活动性差异进行了纬向划分,并对比了西太平洋岛弧—海沟系统地震活动空间分布的差异,表明大陆东部地震活动并非随机分布,各地震区之间的地震活动特征具有明显的差异。着重讨论了华北和长江中下游地震区几十年尺度地震幕演变过程的时空特征。 In this paper, we divide the seismicity differences in the eastern part of the Chinese mainland (the area to the east of 107.5 ° E) and compare the differences in the spatial distribution of the seismic activity in the western Pacific island arc-trenches, indicating that the seismic activity in the eastern part of the mainland is not random Distribution, the seismic activity between the seismic characteristics have obvious differences. This paper focuses on the spatio-temporal features of the evolution of the seismic curtain over the decades in the middle and lower reaches of the North China and the Yangtze River.