ITRF2008 plate motion model
ITRF2008 plate motion model
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DOI：
10.1029/2011jb008930
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发表时间：
2012-07-04
影响因子：
3.9
通讯作者：
Collilieux, X.
中科院分区：
文献类型：
--
作者：
Altamimi, Z.;Metivier, L.;Collilieux, X.
与以往的ITRF解相比，ITRF2008速度场具有更高的质量和更高的精度。我们估计了一个由14个主要板块组成的绝对构造板块运动模型，使用了206个高质量大地测量站点的速度(远离板块边界、变形带和冰川均衡调整(GIA)区)，源于ITRF2008并与之一致。估算模型的精度为0.3 mm/a WRMS。在估计板块旋转极之前，没有对站点速度进行GIA校正，因为我们选择的站点位于Fennoscandia区域之外，我们测试的GIA模型在这些区域表现得相当好，并且远离GIA区域，因为这些区域的模型会降低FIT(南极洲和北美)。我们选择的速度场具有沿三个轴(X，Y，Z)的小起始率偏差分量，分别为0.41+/-0.54，0.22+/-0.64和0.41+/-0.60(95%置信限)。将我们的模型与NNR-NUVEL-1A和新近可用的NNR-MORVEL56进行比较，我们发现对于所有板块，我们与NNR-MORVEL56的一致性比与NNR-NUVEL56的一致性更好，除了澳大利亚，在那里我们观察到平均剩余自转速率为4 mm/a。使用我们选择的站点，我们发现两个模型之间以及我们的模型与NNR-MORVEL56之间的大的全球X自转速率(0.016度/Ma)，相当于地球表面的2.5mM/a。
The ITRF2008 velocity field is demonstrated to be of higher quality and more precise than past ITRF solutions. We estimated an absolute tectonic plate motion model made up of 14 major plates, using velocities of 206 sites of high geodetic quality (far from plate boundaries, deformation zones and Glacial Isostatic Adjustment (GIA) regions), derived from and consistent with ITRF2008. The precision of the estimated model is evaluated to be at the level of 0.3 mm/a WRMS. No GIA corrections were applied to site velocities prior to estimating plate rotation poles, as our selected sites are outside the Fennoscandia regions where the GIA models we tested are performing reasonably well, and far from GIA areas where the models would degrade the fit (Antarctica and North America). Our selected velocity field has small origin rate bias components following the three axis (X, Y, Z), respectively 0.41 +/- 0.54, 0.22 +/- 0.64 and 0.41 +/- 0.60 (95 per cent confidence limits). Comparing our model to NNR-NUVEL-1A and the newly available NNR-MORVEL56, we found better agreement with NNR-MORVEL56 than with NNR-NUVEL-1A for all plates, except for Australia where we observe an average residual rotation rate of 4 mm/a. Using our selection of sites, we found large global X-rotation rates between the two models (0.016 degrees/Ma) and between our model and NNR-MORVEL56 of 0.023 degrees/Ma, equivalent to 2.5 mm/a at the Earth surface.