Abstract
The temporal and spatial distributions of all the 259M⩾6 earthquakes of eastern Chinese mainland (λ⩾108° E) and its adjacent area and all the 153M⩾7 earthquakes of western Chinese mainland (λ<108°E) and its adjacent area up to 1991 were analyzed systematically. These earthquakes are called as strong earthquakes and those of the east before and after 1600, and those of the west before and after 1900, are called respectively as former ones and latter ones. Most of these events were divided into 45 sets of which the each relatively concentrated in both time and space and took the form of group. In the grouping form, the probability of occurrence of a strong earthquake higher than the average appeared simultaneously in time and space. The grouping occurrences of the strong earthquakes of Chinese mainland has been determined as a fundamental feature of the seismicity.
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