Analysis of legacy gravity data reveals sediment‐filled troughs buried under Flathead Valley, Montana, USA

IF 1.1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Near Surface Geophysics Pub Date : 2024-03-22 DOI:10.1002/nsg.12295
Ali Gebril, Mohamed A. Khalil, R. M. Joeckel, James Rose
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Abstract

Shallow, dominantly silt‐ and clay‐filled erosional troughs in Quaternary sediments under the Flathead Valley (northwestern Montana, USA) are very likely to be hydraulic barriers limiting the horizontal flow of groundwater. Accurately mapping them is important because of increasing demand for groundwater. We used a legacy Bouguer gravity map measured in 1968. The directional derivatives of the map are computed, and the map was enhanced by implementing edge detection tools. We produced generalized derivative, maximum horizontal gradient, total gradient and tilt gradient maps through two‐dimensional Fourier transform analysis. These maps were remarkably successful in locating buried troughs in the northern and northwestern parts of the study area, closely matching locations determined previously from compiled borehole data. Our results also identify hitherto unknown extensions of troughs and indicate that some of the buried troughs may be connected.
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对遗留重力数据的分析揭示了埋藏在美国蒙大拿州弗拉特黑德山谷地下的沉积槽
美国蒙大拿州西北部弗拉特黑德山谷(Flathead Valley)地下第四纪沉积物中以淤泥和粘土为主的浅层侵蚀槽很可能是限制地下水水平流动的水力障碍。由于对地下水的需求不断增加,因此准确绘制这些水槽的地图非常重要。我们使用了 1968 年测量的布格重力地图。我们计算了地图的方向导数,并通过边缘检测工具对地图进行了增强。通过二维傅里叶变换分析,我们绘制了广义导数图、最大水平梯度图、总梯度图和倾斜梯度图。这些地图非常成功地定位了研究区域北部和西北部的埋藏槽,与之前通过汇编钻孔数据确定的位置非常吻合。我们的研究结果还确定了迄今未知的地槽延伸部分,并表明一些埋藏的地槽可能是相连的。
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来源期刊
Near Surface Geophysics
Near Surface Geophysics 地学-地球化学与地球物理
CiteScore
3.60
自引率
12.50%
发文量
42
审稿时长
6-12 weeks
期刊介绍: Near Surface Geophysics is an international journal for the publication of research and development in geophysics applied to near surface. It places emphasis on geological, hydrogeological, geotechnical, environmental, engineering, mining, archaeological, agricultural and other applications of geophysics as well as physical soil and rock properties. Geophysical and geoscientific case histories with innovative use of geophysical techniques are welcome, which may include improvements on instrumentation, measurements, data acquisition and processing, modelling, inversion, interpretation, project management and multidisciplinary use. The papers should also be understandable to those who use geophysical data but are not necessarily geophysicists.
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