Graphical interactive generation of gravity and magnetic fields

Pignatelli, A.; Nicolosi, Iacopo; Carluccio, R.; Chiappini, M.; Frese, Ralph von

doi:10.1016/j.cageo.2010.10.003

Cited by 21 publications

(27 citation statements)

References 12 publications

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“…We used a 3D geopotential field generator, GAMFIELD [ Pignatelli et al ., ], to model the seismic high‐velocity body below L'Aquila imaged by the seismic tomography data from Di Stefano et al . [].…”

Section: Geopotential Anomaly Constraints On the Seismic High‐velocitmentioning

confidence: 98%

“…Forward magnetic models of the Vp body reproduced in Figure (white outlined boxes show the source's projection onto the horizontal plane). Modeled magnetic anomaly fields were generated by the GAMFIELD geopotential field generator [ Pignatelli et al ., ]. The fields are modeled at the aeromagnetic data altitude of 2500 m a.s.l.…”

Section: Geopotential Anomaly Constraints On the Seismic High‐velocitmentioning

confidence: 99%

See 1 more Smart Citation

Ultra‐thick Triassic dolomites control the rupture behavior of the central Apennine seismicity: Evidence from magnetic modeling of the L'Aquila fault zone

Speranza

Minelli

2014

JGR Solid Earth

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High-resolution tomography from the 2009 L' Aquila extensional seismic sequence has shown that the Mw 6.1 main shock and most of the aftershocks occurred within a high velocity body (6.6 ≤ Vp ≤ 6.8 km/s), located between depths of 3 and 12 km. The nature of the high-Vp body has remained speculative, although exhumed mafic deep crustal and upper mantle rocks (serpentinites) have been favored. We used 3D magnetic anomaly modeling to investigate the plausibility of these favored sources for the L' Aquila body. The modeling does not support the presence of high-velocity serpentinites with a 30-50% serpentinization degree and gabbros. Accordingly, we conclude that the high-Vp body may represent non-magnetic upper Triassic and possibly lower Liassic dolomites that have been drilled in neighboring wells for 2-4 km. This conclusion is also consistent with the lack of a coherent gravity anomaly for the body. We speculate that ultra-thick Triassic dolomites reaching a thickness of 8 km may have been deposited in syntectonic wedges formed at the northern margin of the Ionian Sea, where oceanic spreading occurred in mid-late Triassic times.

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Section: Geopotential Anomaly Constraints On the Seismic High‐velocitmentioning

confidence: 98%

Section: Geopotential Anomaly Constraints On the Seismic High‐velocitmentioning

confidence: 99%

Ultra‐thick Triassic dolomites control the rupture behavior of the central Apennine seismicity: Evidence from magnetic modeling of the L'Aquila fault zone

Speranza

Minelli

2014

JGR Solid Earth

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“…Butler and Sinha (2012) used COMSOL to simulate an anomalous magnetic field with the same model, and demonstrated excellent agreement. Due to the particularity of the underground pipeline structure, pipeline geometric construction cannot be reconstructed by cube/prism, or finite-volume discretization effectively (Aydın and Oksum, 2012;Lelièvre and Oldenburg, 2006;Pignatelli et al, 2011;Sanchez et al, 2008;Sinex, 2006); further, finite element software requires large computational load and is prone to scatters in pseudo-2D magnetic anomaly detection modeling when working with a thin pipeline (Butler and Sinha, 2012;Churchill et al, 2012;Jeshvaghani and Darijani, 2014). In effort to remedy this, the MDR for TMA simulation of pipeline in this paper is proposed based on finite-volume discretization and modeling of cubic/prism magnet unit structure (Lelièvre and Oldenburg, 2006;Sanchez et al, 2008;Sinex, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Aydın and Oksum (2012) used prism elements to calculate magnetic anomalies above the magnetic basement. Pignatelli et al (2011) presented a Matlab-based geopotential field generator that used Cartesian prisms to construct and visualize subsurface sources in 3D space, and computed their magnetic effects. Sinex (2006), and Sanchez et al (2008) used cube magnet units to reconstruct UXO and non-UXO components and analyzed the induced magnetic anomaly.…”

Section: Introductionmentioning

confidence: 99%

Forward modeling of total magnetic anomaly over a pseudo-2D underground ferromagnetic pipeline

Guo

Liu

Pan

et al. 2015

Journal of Applied Geophysics

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“…Here the prism extends from

(x_{1}, y_{1}, z_{1})

(x_{2}, y_{2}, z_{2})

in the x , y , and z directions, respectively. Traditionally, the analytic expressions for the gravity and magnetic effect of rectangular prism have been extensively used because an arbitrary body can be easily approximated by the collection of vertical prisms [e.g., Blakely , ; Pignatelli et al ., ; Plouff , ].…”

Section: Theory and Analytic Solutionsmentioning

confidence: 99%

New analytic solutions for modeling vertical gravity gradient anomalies

Kim

Wessel

2016

Geochem. Geophys. Geosyst.

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Modern processing of satellite altimetry for use in marine gravimetry involves computing the along-track slopes of observed sea-surface heights, projecting them into east-west and north-south deflection of the vertical grids, and using Laplace's equation to algebraically obtain a grid of the vertical gravity gradient (VGG). The VGG grid is then integrated via overlapping, flat Earth Fourier transforms to yield a free-air anomaly grid. Because of this integration and associated edge effects, the VGG grid retains more short-wavelength information (e.g., fracture zone and seamount signatures) that is of particular importance for plate tectonic investigations. While modeling of gravity anomalies over arbitrary bodies has long been a standard undertaking, similar modeling of VGG anomalies over oceanic features is not commonplace yet. Here we derive analytic solutions for VGG anomalies over simple bodies and arbitrary 2-D and 3-D sources. We demonstrate their usability in determining mass excess and deficiency across the Mendocino fracture zone (a 2-D feature) and find the best bulk density estimate for Jasper seamount (a 3-D feature). The methodologies used herein are implemented in the Generic Mapping Tools, available from gmt.soest.hawaii.edu.

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Graphical interactive generation of gravity and magnetic fields

Cited by 21 publications

References 12 publications

Ultra‐thick Triassic dolomites control the rupture behavior of the central Apennine seismicity: Evidence from magnetic modeling of the L'Aquila fault zone

Ultra‐thick Triassic dolomites control the rupture behavior of the central Apennine seismicity: Evidence from magnetic modeling of the L'Aquila fault zone

Forward modeling of total magnetic anomaly over a pseudo-2D underground ferromagnetic pipeline

New analytic solutions for modeling vertical gravity gradient anomalies

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