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首页> 外文期刊>Surveys in Geophysics: An International Review Journal of Geophysics and Planetary Sciences >A reanalysis and reinterpretation of geodetic and geological evidence of glacial-isostatic adjustment in the Churchill region, Hudson Bay
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A reanalysis and reinterpretation of geodetic and geological evidence of glacial-isostatic adjustment in the Churchill region, Hudson Bay

机译：对哈德逊湾丘吉尔地区冰川等静压调整的大地测量和地质证据的重新分析和重新解释

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摘要

We review the historical, geological, tide-gauge, GPS and gravimetric evidence advanced in favour of, or against, continuing land uplift around Hudson Bay, Canada. We also reanalyse the tide-gauge and GPS data for Churchill using longer time series than those available to previous investigators. The dependence of the mean rate of relative sea-level change obtained from the tide-gauge record on the length and mid-epoch of the observation interval considered is investigated by means of a newly developed linear-trend analysis diagram. For studying the shorter-period variability of the tide-gauge record, the wavelet transform is used. The mean rate of land uplift obtained from GPS is based on a new analysis using IGS solutions of GFZ. To include the post-glacial land uplift, sea-level indicators from the Churchill region representing the relative sea-level history during the past 8000 years are also used. Finally, the values of the four observables are jointly inverted in terms of mantle viscosity. The optimum values are similar to 3.2 x 10(20) Pa s and similar to 1.6 x 10(22) Pa s for the upper- and lower-mantle viscosities, respectively.
机译：我们回顾了赞成或反对加拿大哈德逊湾附近土地持续抬升的历史，地质，潮汐计，GPS和重力证据。我们还使用比以前的研究人员更长的时间序列，重新分析丘吉尔的潮汐仪和GPS数据。借助最新开发的线性趋势分析图，研究了从潮汐记录获得的相对海平面变化的平均速率对所考虑的观测间隔的长度和中期的依赖性。为了研究潮位计记录的短期变化，使用了小波变换。从GPS获得的平均陆地上升速度是基于使用GFZ的IGS解决方案进行的新分析得出的。为了包括冰川后的土地隆升，还使用了丘吉尔地区的海平面指标，这些指标代表了过去8000年的相对海平面历史。最后，根据地幔粘度，将四个可观测值的值联合反转。最佳值分别对应于上地幔粘度和下地幔粘度的3.2 x 10（20）Pa s和1.6 x 10（22）Pa s。

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