Analysis of tidal signals in surface displacement measured by a dense continuous GPS array
Analysis of tidal signals in surface displacement measured by a dense continuous GPS array
复制标题
DOI：
10.1016/j.epsl.2012.08.035
复制
发表时间：
2012-11
影响因子：
5.3
通讯作者：
Linguo Yuan;B. Chao
中科院分区：
文献类型：
--
作者：
Linguo Yuan;B. Chao
我们分析了潮汐位移信号，为8个主要的全日和半日潮，从全球定位系统（GPS）的测量在美国西部在过去的16年与1075个独立的站。通过对内陆与沿海GPS数据的仔细检查，我们能够证明，潮汐信号的估计精度已达到10.1mm（水平）和10.3mm（垂直）的水平，在这样的精度下，在去除体潮和海洋潮汐负荷（OTL）的先验建模影响后，剩余潮汐振幅和相位中显示出连贯的空间模式。我们展示了现代精确的GPS数据的设施，不仅限制了海潮模型，但更重要的是，在提供源数据的区域，复杂的爱数的地球物理推断的弹性和非弹性结构的异质性在固体地球的深部内部潮汐时标。
We analyze the tidal displacement signals, for the eight major diurnal and semidiurnal tides, from Global Positioning System (GPS) measurements made at the Western United States over the past 16years with 1075 independent stations. By careful examinations among inland versus coastal GPS data we are able to demonstrate that estimated precisions down to the level of ∼0.1mm (horizontal) and ∼0.3mm (vertical) have been reached for the tidal signals, and that at such precisions coherent spatial patterns are revealed in the residual tidal amplitudes and phases after the removal of a priori modeled effects of body tides and ocean tidal loading (OTL). We demonstrate the facility of modern precise GPS data in not only constraining the ocean tide models but, more significantly, in providing source data in terms of regional, complex Love numbers for geophysical inference of the heterogeneities of elastic and inelastic structures in the solid Earth's deep interior on tidal timescales.