华北中强地震前地震活动的模式识别
THE PATTERN RECOGNITION OF SEISMICITY BEFORE MODERATE STRONG SHOCK IN NORTH CHINA
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摘要: 本文通过对历史地震资料的分析,选取12个特征作了描述华北地震区的各不同时期的地震活动图象,并以1515年至1900年华北地震区内7级以上地震和6级地震的发生时段作为样本,用模式识别方法,分二次识别过程分析了7级地震和6级地震前的异常特征,取得了描述7级和6级地震的异常标志,并由此对未参加识别的1951年至1984年的地震活动作出预测,得到了与实际比较一致的结果。Abstract: Based on the analysis of the historical earthquake documents in North China and the 12 different features selected for describing the seismic activity pattern in different perio-ds, taking occurrence period of earthquakes M≥7 or 6< M< 7 from 1525 to 1900, prem-onitory phenomena before 7 and 6 magnitude earthquake have been analysised with pattern recognition method at twice.The precursor information before M≥7 and 7 >M≥6 eart-hquake have been obtained.According these, the seismicity from 1951 to 1984 period have been recognized by same method.The results are consistent with practice.
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