利用EGM2008重力场模型反演青藏地区构造应力场

Inversion of Tectonic Stress Field in Qinghai -Tibet Area with EGM2008 Gravity Model

利用重力资料能够获取区域构造应力场的总体特征。采用2160阶EGM2008重力场模型计算了青藏地区重力异常和垂线偏差，并分别用垂线偏差和重力异常数据反演了青藏地区构造应力场，反演结果表明：两类数据反演结果相一致，青藏地区构造应力场复杂，喜马拉雅地块、阿尔金山-祁连山断裂带、柴达木断裂带以及龙门山断裂带地区受到明显挤压作用，构造应力聚集明显、构造应力值高，反映了这些地区构造运动活跃，与地震历史资料相符。

The general characteristics of regional tectonic stress fietd can be obtained by using gravity data. Gravity anomaly and vertical deflection in Qinghai -Tibet areaare calculated by using EGM2008 gravity model of 2160 order. Tectonic stress field in Qinghai -Tibet area is calculated with gravity anomaly and vertical deflection respectively. The result shows that the inversion results are consistent. Tectonic stress field in Qinghai - Tibet area is complicated. Tectonic stress distribution is gathered obvious- ly in Himalayan block, Altun Mountains - Qilian Mountains Fault zone, Qaidam Fault zone and Longmenshan Fault zone. The average value of the tectonic stress in these zones is higher than in other areas, which shows that the tectonic movement is active in these areas and consistent with the historical earthquake data.