Joint inversion of gravity with cosmic ray muon data at a well-characterized site for shallow subsurface density prediction
Joint inversion of gravity with cosmic ray muon data at a well-characterized site for shallow subsurface density prediction
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DOI：
10.1093/gji/ggz127
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发表时间：
2019-06
影响因子：
2.8
通讯作者：
K. Cosburn;M. Roy;E. Guardincerri;C. Rowe
中科院分区：
文献类型：
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作者：
K. Cosburn;M. Roy;E. Guardincerri;C. Rowe
估计地下密度对于对火山建筑物、水库和含水层等各种地质结构进行成像非常重要。 μ子断层扫描最近被用来补充传统的重力测量，作为探测火山下方浅层地下密度结构的有力方法。重力和μ子数据具有明显不同的空间敏感性，因此，这种组合对于在大于交叉μ子轨迹所包围的区域的空间尺度上成像结构非常有用。在这里，我们在一个研究区域探索并测试了重力和 μ 子数据的联合反演，该区域存在独立特征的目标异常：美国新墨西哥州洛斯阿拉莫斯下方的区域广泛的高密度层。我们使用独特的实验装置解析了几乎平坦的结构，其中在目标体积上方和下方获得表面和地下重力以及μ子测量。我们的结果表明，在最小的地质（先前）约束下，联合反演可以正确地恢复预期密度结构的显着特征。我们的研究结果说明了结合地表和地下（例如钻孔）重力和μ介子测量来反演浅层地质结构的潜力。
Estimating subsurface density is important for imaging various geologic structures such as volcanic edifices, reservoirs and aquifers. Muon tomography has recently been used to complement traditional gravity measurements as a powerful method for probing shallow subsurface density structure beneath volcanoes. Gravity and muon data have markedly different spatial sensitivities and, as a result, the combination is useful for imaging structures on spatial scales that are larger than the area encompassed by crossing muon trajectories. Here we explore and test a joint inversion of gravity and muon data in a study area where there is an independently characterized target anomaly: a regionally extensive, high-density layer beneath Los Alamos, New Mexico, USA. We resolve the nearly flat-lying structure using a unique experimental set-up wherein surface and subsurface gravity and muon measurements are obtained above and below the target volume. Our results show that with minimal geologic (prior) constraints, the joint inversion correctly recovers salient features of the expected density structure. The results of our study illustrate the potential of combining surface and subsurface (e.g. borehole) gravity and muon measurements to invert for shallow geologic structures.