CGCS2000板块模型构建

CGCS2000 Plate Motion Model

基于中国地壳运动观测网络2001—2010年跨度长达10年的观测数据,采用基准优选、变异点数据分段处理等策略,计算获得ITRF2005框架下高精度速度场。同时针对国际上现有的NNR NUVEL1A、APKIM2005、PB2002等板块模型在中国区域适应性差,基于中国地质构造特性及实际速度场解算结果,构建了中国20个二级板块模型CPM-CGCS2000。采用本文提出的用板块模型参数将站点归算至CGCS2000的方法对板块模型进行外部检核,并用此方法验证所建的二级块体模型,精度可达2～3 cm。与国际上现有比较成熟的速度场模型———ITRF2005、APKIM2005、PB2002、NUVEL1A及国内文献[1—2]的板块模型进行的比较表明,CPM-CGCS2000板块模型实际精度优于目前现有的模型。

It is presented that methodology for the establishment of the China Plate Motion model,CPM-CGCS2000,and the performance assessment results of the new model developed based on 10 consecutive years GPS observations from China＇s Crustal Movement Observation Network.In the development of the new model,the approaches of optimising the reference frame,and segmenting time series based on the sudden abnormal deformation of base stations are used.A total of 20 subplates are identified and CPM-CGCS2000 model is developed for high accuracy national velocity field in ITRF2005.The test results show that the precisions of the optimal parameter estimates of the new model are mostly better than 1 mm/a.These parameters are also used to transform the coordinates of 28 base stations into CGCS2000 for a further validation of the models.The results show 2~3 cm differences between the transformed and the known coordinates of these points in CGCS2000,which could be regarded as the accuracy the new model achieved.Moreover,the comparisons of four reference stations＇ coordinates in CGCS2000 transformed from both the new model and other three global plate motion models-APKIM2005,PB2002 and NUVEL1A,and also two China national models-Fu Yang（2002） and Wei Ziqing（2011） indicate the superior accuracy of the new model.