丽江7.0级地震前跨断层形变累积率的变化特征

通过对丽江7．0级地震前跨断层短水准、短基线资料断层形变累积率的计算分析，表明丽江地震前跨断层形变累积率在空间分布上及演化过程中有一定的分布特征。以丽江-剑川断裂为界，其西部震中附近的断层形变累积率相对较低，而其东部周围的则较高，且震前存在累积率减小的调整过程。由此可见，地震不一定发生在形变累积率高的地区，而通常发生在多年形变累积率空间分布差异性显著的地区。通过多场地断层形变累积率的计算，分析其空间分布特征及演变，结合其它手段资料，对地震中、长期危险区的判定及中短期危险性的判定有重要的参考意义。

Variation Characteristics of Cumulative Percentage of Cross - fault Deformation before M7.0 Lijiang Earthquake

According to the analyzed results,the cross-fault cumulative prercentage of deformation is proved to have some characterists in space distribution as well as in the preparing process before Lijiang Earthquake.To the east part of Lijiang-jianchuan Fault (namely the epicentral area of Lijiang Earthquake), The cumulative percentage is relatively low. But to the east part of it, the cumulative percentage is high.There was an adjusting process in which the cumulative percentage was going down before the earthquake occurred. So it is obvious that the earthquakes do not always occur in the high cumulative percentage area but normally occur in the areas in which the distribution of the cumulative percentage is distinct. So, through calculation of multi-field cumulative percentage of deformation of fault, one can analyze the characteristics of cumulative percentage in space distribution and in evolution. Together with data got by other surveying methods,the characteristics of cumulative percentage can be referential to the discrimination of mid-long term earthquake risk area and the mid-short term earthquake area.