Curie Point Depth from Spectral Analysis of Magnetic Data in the Southeast Tibet

Yang, Kai

doi:10.11648/j.earth.20170605.15

Cited by 2 publications

(1 citation statement)

References 47 publications

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“…Hsieh et al (2014) divided the integrated magnetic anomaly data of Taiwan into square subregions (250 × 250 km 2 ) and calculated 2016) by creating windows with a 100-km edge and a 50% overlap between the aeromagnetic data and data from the Earth Magnetic Anomaly Grid two over the study area. Yang et al (2017) calculated the CPD of Southeast Tibet via a spectral analysis of satellite data magnetic anomalies. Finally, Blakely (1995) presented the power spectral density of the total magnetic field [ϕ ΔΤ (k x ; k y as follows:…”

Section: Spectral Peak Methods (Two-dimensional Power Spectrum)mentioning

confidence: 99%

Geometry of the Magma Chamber and Curie Point Depth Beneath Hawaii Island: Inferences From Magnetic and Gravity Data

et al. 2022

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This study used land gravity and airborne magnetic data to investigate the depth to the magmatic chamber and map the heat flow distribution beneath the active volcanoes of Hawaii Island using the Curie point depth (CPD) and gravity modeling. Obtaining some of the ground-based geophysical measurements was problematic due to accessibility limitations; therefore, this study used available data. The CPD and magnetic data were used to map the depth to the bottom of the magnetic layer by calculating the depth to the Curie isotherm (540°C) beneath Hawaii Island. The spectral peak method was used to calculate the depths to the shallow and deep magnetic sources for the entire island, and the CPD was calculated using the centroid method. A two-dimensional density model for two Earth layers was constructed using forward modeling of the gravity data. A large plume of dense intrusive material was observed beneath the three adjacent volcanoes of Mauna Loa, Mauna Kea, and Kilauea, and two small chambers were found to be located beneath the Kohala and Hualalai volcanoes. Based on the gravity modeling results, the depth to the magma layer varied from 0.5 to 10 km, and the heat flow was higher close to the volcanic eruption zones. The current study is informative and cost effective for the world’s most active volcanic areas.

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Section: Spectral Peak Methods (Two-dimensional Power Spectrum)mentioning

confidence: 99%

Geometry of the Magma Chamber and Curie Point Depth Beneath Hawaii Island: Inferences From Magnetic and Gravity Data

et al. 2022

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Modelling the geothermal potentials Energy of Abakaliki Lower Benue Trough Nigeria using Fourier transform of digital aeromagnetic data

Usman,

Mbachu,

Okonkwo

et al. 2024

Int. J. Phys. Sci.

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Aeromagnetic data over part of the Abakaliki Lower Benue Trough has been evaluated to estimate the geothermal energy potential and model the morphology of the basin through assessing the depth to the magnetic basement and modeling prominent magnetic anomalous bodies. The data were acquired, analyzed, and interpreted. Qualitative analysis, using visual inspection of Total Magnetic Intensity (TMI), Residual Anomalous (RAM), and Analytical Structural (ASM) maps, shows that the majority of faults trend east-west, while few others orientate in the NNE to SSW directions. The visual assessment of TMI and RAM maps reveals high magnetic intensities ranging from 6700 to 7505 nT and -100 to 250 nT, respectively. Areas with high magnetic values suggest lower sedimentary infilling, while areas with lower magnetic values suggest thicker sedimentary covers. The western part of the research area exhibits structural alteration around the Ishiagu, Enyigba, and Eziagu regions. There is evidence of intrusive bodies around Obubura and Onyen in the southeast region of the research area. The quantitative results show two depth sources: the deep sources range from 10.71 to 21.88 km, and the shallow sources range from 2.52 to 9.45 km. The deeper sources suggest further depth to the geothermal contact sources. The sediment accumulation pattern from the basin morphological map reveals uneven, undulating, and structurally controlled depositional patterns across the entire research area. The results also show a linear depression with sedimentary accumulation trending northwestsoutheast. The 3D subsurface basal configuration map reveals uplifting and depression, which is a distinctive expression of folds. The average sedimentary infilling thickness and the geothermal gradient are 8.2 km and 13.9°C/km, respectively. The correlation between heat flow and geothermal gradient shows linear relationships, implying that areas of higher heat flow correspond to regions of higher geothermal energy.

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Curie Point Depth from Spectral Analysis of Magnetic Data in the Southeast Tibet

Cited by 2 publications

References 47 publications

Geometry of the Magma Chamber and Curie Point Depth Beneath Hawaii Island: Inferences From Magnetic and Gravity Data

Geometry of the Magma Chamber and Curie Point Depth Beneath Hawaii Island: Inferences From Magnetic and Gravity Data

Modelling the geothermal potentials Energy of Abakaliki Lower Benue Trough Nigeria using Fourier transform of digital aeromagnetic data

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