关键词: 华东地区, 模式识别法, 危险区划

Abstract: Using the modified Cora-3 pattern recognition algorithm established by I.M.Gel-fand et al., we have studied the related date in tectonics, geomorphology and geophysics to identify destructive earthquake-prone regions in East China(30?-35癗, 116?-123癊). The results are satisfactory.Seven D (Dangerous) and eight N (Non-dangerous) "characteristic traits" are selected from sixteen original features. The geological meanings of the traits are analyzed. It shows that destructive earthquakes in East China often occur in such regions as inside subsidence areas during the neotectonic period, inside or in the margin of Cretaceous or Cainozoic structural/faulted-down basins, near the boundaries of the blocks having vertical neotectonic movement of contrasting nature, as well as where there are abundant active faults. In the above-mentioned regions some degree of geophysical anomalies generally appears at the same time.The mis-identifying rate in the course of "Voting" is low. By voting we have zoned five earthquake-prone regions in East China. The conclusions are confirmed by the control experiments.

Key words: Eastern China, Pattern recognition, Zoning of dangerous areas