用大地测量数据反演2001年昆仑山地震

USING GEODETIC DATA TO INVERSE CO-SEISMIC DISLOCATION OF 2001 KUNLUN EARTHQUAKE

利用GPS和水准测量数据 ,采用模拟退火算法与分段断裂位错模型 ,对 2 0 0 1年昆仑山Ms8.1地震同震位错进行了反演研究。结果表明 :断层总长 390 (km)左右 ,呈直立走滑型 ,各断裂段左旋走滑量最大为 5～ 6m ,反演结果基本反映了地震破裂的总体特征 ;该地区岩石剪切模量 μ约为 4 .3× 10 10 Pa ;GPS和水准测量数据的联合使得多个参数的同时反演易于实现 ;

On the basis of data of GPS and leveling,we adopt the simulated annealing algorithm and segmented fault dislocation model to inverse the coseismic dislocation during the 2001 Kunlun earthquake. The result suggests that: ①The fault is about 390 km long and dips about 90 degree with the greatest left lateral strike slip distance of about 5-6 meters.The result of inversion reflects basically the overall characteristic of the seismic fracture.②The shear modulus of rock in the study region is about 4.3×10\+\{10\} Pa. ③Combining GPS data with leveling data makes it possible to inverse sevaral parameters simultaneously. Geodetic data accord well with the results of the field investigation.