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本文介绍基于地震活动性的强震中长期预报的三种新方法，即自助统计，Ｓｏｍｐｉ谱分析及模糊时空分维。对川滇地区一些强震的震例分析检验结果表明，这三种新方法可在数年期的强震中长期预报中发挥一定的作用．
This paper presents three new methods for medium and long-term prediction of strong earthquakes based on seismicity: self-help statistics, Sompi spectrum analysis and fuzzy spatio-temporal fractal dimension. The test results of earthquake cases of some strong earthquakes in Sichuan and Yunnan Provinces show that these three new methods can play a certain role in mid- and long-term prediction of strong earthquakes of several years.