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首页> 外文期刊>Journal of geophysical research. Solid earth: JGR >Changing Moho Beneath the Tibetan Plateau Revealed by GRACE Observations
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Changing Moho Beneath the Tibetan Plateau Revealed by GRACE Observations

机译：在藏高的高原下改变Moho揭示了恩典观察

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摘要

A wide range of mass gain in the inland of the Tibetan Plateau (TP) has been observed by the Gravity Recovery and Climate Experiment (GRACE). But there are still controversies on how to understand this phenomenon. In this paper, satellite geodesy data and hydrological models are combined and applied for extracting signals caused by tectonic processes in the TP during the period from 2003 to 2009. We find that in the inland of the TP there are three regions with a significant signal that should be attributed to tectonic processes. The three prominent mass signals, each located in the western, central, and eastern TP, are estimated to be at the rate of 1.47 ± 0.43, ?0.85 ± 0.53, and 1.51 ± 0.56 cm/year, respectively, in equivalent water height. However, the rate caused by Earth surface deformation constrained by GPS is 0.33 ± 0.15/0.30 ± 0.10/0.14 ± 0.24 cm/year in equivalent water height, which cannot explain the whole tectonic signals and indicates that a significant mass change occurs beneath the crust, that is, the deformation of the Moho interface. We estimate the Moho change rate in the inland of the TP and find that the Moho interface is suffering an uneven deformation. The Moho is uprising at a rate of 18.1 ± 7.2 mm/year in the west and 21.7 ± 9.7 mm/year in the east of the TP, while there is an obvious deepening rate of ?18.3 ± 8.6 mm/year in the central TP.
机译：通过重力恢复和气候实验（Grace）观察到藏高原（TP）内陆的广泛质量收益。但是如何理解这种现象仍然存在争论。在本文中，合并卫星大地测量数据和水文模型，并应用于2003年至2009年期间TP中TP中的构造过程引起的信号提取。我们发现在TP的内陆有三个具有重要信号的区域应该归因于构造过程。每个位于西部，中央和东部TP的三个突出质量信号估计为1.47±0.43，Δ0.85±0.53和1.51±0.56厘米/年，在等效水高度。然而，由GPS约束的地球表面变形引起的速率在等效水高度下为0.33±0.15 / 0.30±0.10 / 0.14±0.24厘米/年，这不能解释整个构造信号并表明在地壳下面发生显着的质量变化，也就是说，Moho界面的变形。我们估计了TP内陆的Moho变化率，发现Moho界面遭受了不均匀的变形。 Moho的起始率为38.1±7.2毫米/年/年度，在TP东部21.7±9.7毫米/年，而在中央TP中有明显的深化率？18.3±8.6毫米/年。

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