Bouguer gravity anomalies and the three-dimensional density structure of a thick mudstone area: A case study of southwestern Taiwan

Lo, Yu-Tsung; Ching, Kuo En; Yen, Horng Yuan; Chen, Song-Chuen

doi:10.1016/j.tecto.2023.229730

Cited by 5 publications

(3 citation statements)

References 36 publications

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“…Free air anomaly is created by applying free air correction to the data from the global gravity model. Topography information from a DEM is used to assess free air anomalies [6], [7]. With free air correction, bouguer correction, and terrain adjustment applied to the global gravity model data, CBA is achieved.…”

Section: Resultsmentioning

confidence: 99%

“…The free air anomaly is a term used in geophysics and gravity studies to describe a specific type of gravity anomaly on the Earth's surface. Gravity anomalies occur due to variations in the Earth's gravitational field caused by differences in subsurface density distribution [6], [7]. The free air anomaly data from GGMplus is compared with the terrestrial gravity data shown in From the visualization results and value intervals, it shows that there is not much difference between the terrestrial FAA and FAA GGMPlus models.…”

Section: Free Air Anomaly (Faa)mentioning

confidence: 98%

“…FAA is free air anomaly (mgal), 𝑔 𝑜𝑏𝑠 is observation gravity (mgal), 𝑔 𝜑 is latitude corrected gravity (mgal), and FAC is free air correction (mgal) [6], [7].…”

Section: Free Air Correctionmentioning

confidence: 99%

See 2 more Smart Citations

Geological Structure Model for Recharge Area in Patuha Geothermal Field

Indriani,

Anjasmara,

Utama

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Geothermal sustainability requires geological structure analysis using gravity methods for groundwater management. Geological structure analysis reviews fault data. Geological structure as a pathway for fluid movement for groundwater management in the research area, especially the Patuha Geothermal Field, West Java. This study uses global gravity model, terrestrial gravity, DEM, and geological data. The gravity method applied in this research involves calculations for latitude correction, free air correction, bouguer correction and terrain correction. The final results of this research are free air anomaly, complete Bouguer anomaly, and model evaluation (MRSE, MRE, and MAE). Free air anomaly results from free air correction of global gravity model data. DEM topography analyzes free air anomaly. The FAA data model evaluated RMSE at 1.27, MRE at 0.004, and MAE at 0.83. 138.02–280.26 mgal is the FAA range. The research area’s elevation range is 836–2431 m. Topography and free air anomaly correlate 0.75. Positive high connection. Mountains and plateaus may have positive gravity anomalies. Free air, bouguer, terrain, and CBA are applied to global gravity model data. The CBA model evaluation indicates quality. RMSE is 1.47, MRE is 0.012, and MAE is 1.11. CBA fluctuation implies fault spread. Faults serve as water flow conduits and channels, increasing the risk of infiltration. Meanwhile, cracks are being distributed as conduits and for infiltration. This research forms the basis for developing and increasing geothermal production so that further studies are needed regarding the influence of geological structures for reservoir in geothermal areas.

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Section: Resultsmentioning

confidence: 99%

Section: Free Air Anomaly (Faa)mentioning

confidence: 98%