Evaluating temporal stability of the New Zealand quasigeoid following the 2016 Kaik?ura earthquake using satellite radar remote sensing
Evaluating temporal stability of the New Zealand quasigeoid following the 2016 Kaik?ura earthquake using satellite radar remote sensing
复制标题
使用卫星雷达遥感评估 2016 年凯库拉地震后新西兰准大地水准面的时间稳定性
DOI：
10.1093/gji/ggz536
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发表时间：
2019
影响因子：
2.8
通讯作者：
Nishijima J
中科院分区：
文献类型：
--
作者：
McCubbine J C;Stagpoole V;Caratori T F;Featherstone W E;Garthwaite M C;Brown N J;Amos M J;Fukuda Y;Kazama T;Takiguchi H;Nishijima J
大地水准面模型可以从地表重力异常中确定，因此对地形形状的变化以及重力的变化都很敏感。在这里，我们提出了2016年Mw7.8 Kaikōura地震后合成孔径雷达数据的重力/准大地水准面变化的正演模拟结果，陆地隆起高达10米。我们评估的影响，地形变形的参考表面的新西兰垂直基准代替昂贵的重力场测量。最显着的模拟重力和似大地水准面的变化是-2.9 mGal和5-7毫米，分别。我们将我们的正演模拟重力信号与地面重力观测数据进行了比较，结果表明数据集之间的差异具有±0.1 mGal的标准差。在准大地水准面的最大模拟变化是一个数量级小于57.7毫米的估计精度最近计算的新西兰大地水准面模型在Kaikōura地区。模拟准大地水准面的变化暗示了这一特定的变形事件是没有统计意义的新西兰准大地水准面模型的估计精度。
Quasigeoid models can be determined from surface gravity anomalies, so are sensitive to changes in the shape of the topography as well as changes in gravity. Here we present results of forward modelling gravity/quasigeoid changes from synthetic aperture radar data following the 2016Mw7.8 Kaikōura earthquake with land uplift of up to 10 m. We assess the impact of the topographic deformation on the reference surface of the New Zealand vertical datum in lieu of costly field gravity field measurements. The most significant modelled gravity and quasigeoid changes are—2.9 mGal and 5–7 mm, respectively. We compare our forward modelled gravity signal to terrestrial gravity observation data and show that differences between the data sets have a standard deviation of ±0.1 mGal. The largest modelled change in the quasigeoid is an order of magnitude smaller than the 57.7 mm estimated precision of the most recently computed NZGeoid model over the Kaikōura region. Modelled quasigeoid changes implied by this particular deformation event are not statistically significant with respect to estimated precision of the New Zealand quasigeoid model.