Improving a maximum horizontal gradient algorithm to determine geological body boundaries and fault systems based on gravity data

Kha, Tran Van; Vuong, Hoang Van; Thanh, Do Duc; Hung, Duong Quoc; Anh, Le Duc

doi:10.1016/j.jappgeo.2018.03.023

Cited by 17 publications

(1 citation statement)

References 11 publications

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“…This method involves the calculation of a horizontal gradient and comparison of the horizontal gradient of a centre point with its eight nearest neighbours in four directions within each 3 × 3 calculation grid. The horizontal location and magnitude of the maximum values are found by interpolating a second‐order polynomial through the trio of points provided that the magnitude of the middle point is greater than its two nearest neighbours in one direction (Van Kha et al., 2018).…”

Section: Gravity Data Analysismentioning

confidence: 99%

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

Gebril,

Khalil,

Joeckel

et al. 2024

Near Surface Geophysics

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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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Section: Gravity Data Analysismentioning

confidence: 99%