Inversion of Airborne Gravity Data Acquired over Subglacial Lakes in East Antarctica
Inversion of Airborne Gravity Data Acquired over Subglacial Lakes in East Antarctica
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南极洲东部冰下湖泊上空获得的机载重力数据反演
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
J. Holt
中科院分区：
文献类型：
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作者：
I. Filina;D. Blankenship;L. Roy;Mrinal K. Sen;T. Richter;J. Holt
在东南极洲两个最大的冰下湖泊上获得了机载重力数据，并对这些数据进行了若干固定密度对比值的二维反演，以估计水深和沉积物厚度。对于Vostok湖，重力反演剖面与地震测深剖面的最佳一致性为：主岩密度为2.55 g cm - 3，沉积物密度为1.85 g cm - 3。结果表明，湖底的地形上升将湖泊划分为两个子盆地。我们的反演结果表明，在所有可能的冰/水与围岩密度对比中，康科迪亚湖的水厚度不超过200 m；沉积物层不能被分解。
Airborne gravity data have been acquired over the two largest subglacial lakes in East Antarctica. 2D inversion of these data was performed for several fixed values of density contrast in order to estimate bathymetry and sediment thickness. For Lake Vostok the best agreement between profiles derived from gravity inversion and seismic soundings is achieved for densities 2.55 g cm−3 for host rock and 1.85 g cm−3 for sediment. The result shows a topographic rise of the lake bottom dividing the lake into two sub-basins. Our inversion results suggest that water thickness in Lake Concordia does not exceed 200 m for all possible density contrasts between ice/water and surrounding rock; the sediment layer cannot be resolved.