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通过远震记录ＳＨ波位移脉冲的二阶矩的计算，得到了１９８８年澜沧地震（ＭＳ＝７．６）震源扩展参数．采用最小二乘原理反演了震源过程的持续时间Ｔ、断层长度Ｌ和方向性参数Ｄ，并得到Ｔ＝１１．７７ｓ、Ｄ＝１５．０５ｋｍ·ｓ、Ｌ＝７０．９４ｋｍ．结果表明，１９８８年澜沧地震为对称双侧破裂，两侧破裂长度均为３５ｋｍ．结合余震分布分析表明，在两个主震破裂区的连接部位存在着一个主震时未破裂的区域．由于主震时的位错，应变将重新调整．连接部位具有足够的强度，以储存可以激发较大余震的应变能
Based on the second moment of the SH wave displacement pulse recorded by teleseismic, the source expansion parameters of the 1988 Lancang earthquake (MS = 7.6) were obtained. The least squares principle was used to invert the duration T, the length of fault L and the directional parameter D, and obtained T = 11.77s, D = 15.05km · s and L = 70.94km. The results show that the Lancang earthquake in 1988 was a symmetrical bilateral rupture with rupture lengths of 35km on both sides. According to the aftershock distribution analysis, there is an unbroken area at the junction of the two main shock ruptures. Due to dislocations during the main shock, the strain will be readjusted. The joints have sufficient strength to store the strain energy that can excite larger aftershocks