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前言拉萨地区(N90°—92°,E29°—31°.5)的强震活动自1976年至1987年平静十年之后,于1987年9月、10月发生5.3级地震两次。当时作者曾撰文对拉萨地区强震活动特征作了基本的分析。继后,1989年2月和1992年7月,再次发生5.6级、6.5级两次尼木地震。根据认识来源于实践又受实践检验的原则,有必要对作者原有认识加以进一步的研讨,以助于对拉萨地区震情分析和防震预测研究的深入开展。
Preface Strong earthquakes in the Lhasa area (N90 ° -92 °, E29 ° -31 ° .5) occurred two decades after the ten-year period of calm from 1976 to 1987, with a magnitude 5.3 earthquake in September and October 1987. At that time, the author had written a basic analysis of the characteristics of strong earthquakes in Lhasa. Following that, in February 1989 and July 1992, another 5.6 earthquakes occurred at 5.6 and 6.5 levels, respectively. According to the principle of knowing from practice and being tested by practice, it is necessary to further study the original understanding of the author so as to help further the research on the earthquake situation analysis and earthquake prediction in Lhasa.