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利用已有的GPS观测数据,借助球面最小二乘配置方法对天山地区的GPS速度场进行研究,得到了研究区域应变场的空间分布特征.其最大主压应变表明,大地震多发生在主压应变快速交替变化的地带,主压应变最大值主要分布于西南天山与帕米尔弧及塔里木西北交汇的地区,强地震(M7.0—8,0)基本发生在该区域.面膨胀值表明天山地区应变呈挤压收缩的特征.
Using the existing GPS observation data, the spheric least square collocation method is used to study the GPS velocity field in Tianshan Mountains, and the spatial distribution of the strain field in the study area is obtained. The maximum principal compressive strain indicates that the major earthquakes happen at the main pressure In the areas where the strain changes rapidly and rapidly, the maximum principal compressive strain is mainly distributed in the area where the southwest Tianshan intersects with the Pamir arc and the northwest of Tarim. Strong earthquakes (M7.0-8,0) basically occur in this area. Regional strain was squeezed contraction characteristics.