We investigate the impact of combining Gravity Field and Steady‐state Ocean Circulation Explorer (GOCE) satellite gravity anomaly and Bedmap2 terrain relief data to enhance Antarctic seismic Moho estimates over the satellite's coverage region south of latitude 60°S. The study considers improving the seismic surface wave‐inferred AN1 Moho (An et al., 2015a, https://doi.org/10.1002/2014JB011332) from misfits of the gravitational effects of the terrain and the seismic Moho computed at 250 km altitude. The updates also relate the GOCE gravity anomalies that correlate directly and inversely with the terrain's gravity effects as isostatic anomalies of the uncompensated mantle relief. These terrain‐correlated effects infer potential isostatic adjustments of the Moho that may help constrain the crust's stress field, track the Gamburtsev Subglacial Mountains to the Kerguelen mantle hotspot, and further test the putative Wilkes Land impact basin for its crustal attributes. Analysis of the gravity‐updated seismic AN1 Moho (sAMoho) estimates suggests that most are within the seismic errors of several kilometers or less. However, the gravity‐updated estimates that are deeper than the sAMoho estimates tend to characterize anomalously hot upper mantle where the assumed mantle‐to‐crust density contrast may be too low. These Moho difference estimates discern elevated heat flow for the Maud Rise, Kerguelen Plateau, Pacific‐Antarctic Ridge, and most of western Antarctica extending from the Pacific‐Antarctic Ridge along the Transantarctic Mountains and across the Ross Sea through Marie Byrd Land and the western margin of the Antarctic Peninsula Microplate to the Scotia Ridge. The methodology of this study also is effective in updating any Moho model for improved gravity and terrain data.

中文翻译：

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南极莫霍面的卫星重力约束及其潜在的等静线调整

我们研究了结合重力场和稳态海洋环流探测器（GOCE）卫星重力异常以及Bedmap2地形起伏数据对增强南纬60°S以南卫星覆盖范围的南极地震Moho估计的影响。该研究考虑从地形的重力效应和250 km高度计算出的地震Moho的失配来改善地震面波推断的AN1 Moho（An等人，2015a，https://doi.org/10.1002/2014JB011332） 。这些更新还与GOCE重力异常有关，GOCE重力异常与地形的重力效应直接或反向相关，作为未补偿地幔释放的等静线异常。这些与地形相关的效应推断出Moho的等静压调整可能有助于约束地壳的应力场，追踪Gamburtsev冰川下山脉到Kerguelen地幔热点，并进一步测试假定的Wilkes Land撞击盆地的地壳属性。对重力更新的地震AN1 Moho（sAMoho）估计值的分析表明，大多数地震误差在几千米或更短的范围内。但是，比sAMoho估算值更深的重力更新估算值往往可以表征异常高温的上地幔，而假定的地幔与地壳密度对比可能太低。这些Moho差异估算值可以看出太平洋南极海岭Kerguelen高原Maud Rise的热流升高，南极西部的大部分地区从太平洋南极山脊沿跨南极山脉延伸，穿过罗斯海，穿过玛丽·伯德土地和南极半岛微板块的西缘一直延伸到斯科蒂亚山脊。这项研究的方法论也可以有效地更新任何Moho模型，以改善重力和地形数据。