Results 21 to 30 of about 6,954 (297)
Compatibility of high-altitude aeromagnetic and satellite-altitude magnetic anomalies over Canada [PDF]
, 2002 Results from equivalent-source distributions derived jointly from high-altitude (average 4 km) aeromagnetic and Magsat-derived (average 400 km) magnetic anomalies over Canada indicate that long-wavelength components (500–2500 km) in these fields are ...
Ravat, D. +4 more
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Velocity continuation in the downward continuation approach to seismic imaging [PDF]
Geophysical Journal International, 2009 SUMMARY One way of developing a wave-equation approach to seismic imaging is based on the concept of downward continuation of observed surface reflection data. Seismic imaging is typically based on the single scattering approximation, and assumes the knowledge of a smooth background model in which the mentioned downward continuation is carried out ...
Anton A. Duchkov, Maarten V. de Hoop
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Stable downward continuation of the gravity potential field implemented using deep learning
Frontiers in Earth Science, 2023 Downward continuation (DC) of the gravity potential field is an important approach used to understand and interpret the density structure and boundary of anomalous bodies.
Honglei Li +11 more
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Earth and Space Science, 2021 Depth estimation of potential field data is a powerful tool for geologic source interpretation. It can be implemented by using downward continuation method based on a normalized algorithm.
Wenna Zhou, Chong Zhang, Dailei Zhang
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Contributions to Geophysics and Geodesy, 2018 Transformation based on downward continuation of potential fields is an important tool in their interpretation – depths of shallowest important sources can be determined by means of stable downward continuation algorithms.
Roman PAŠTEKA +2 more
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A numerical test of the topographic bias
Journal of Geodetic Science, 2018 In 1962 A. Bjerhammar introduced the method of analytical continuation in physical geodesy, implying that surface gravity anomalies are downward continued into the topographic masses down to an internal sphere (the Bjerhammar sphere).
Sjöberg L.E., Joud M.S.S.
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Mathematics, 2021 The paper describes a method of gravity data inversion, which is based on parallel algorithms. The choice of the density model of the initial approximation and the set on which the solution is sought guarantees the stability of the algorithms. We offer a
Petr Martyshko +2 more
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Spectral methods in gravity inversion: the geopotential field and its derivatives
Annals of Geophysics, 1997 The 3D spectral analysis of the gravitational potential field for a given mass distribution is studied. The derived quantities, the gravitational force field and the gravity gradient tensor are computed in frequency space.
C. Braitenberg, M. Zadro
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Earth, Planets and Space, 2020 Obtaining horizontal edges and the buried depths of geological bodies, using potential field tensor data directly is an outstanding question. The largest eigenvalue of the structure tensor is one of the commonly used edge detectors for delineating the ...
Yuan Yuan +4 more
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Preliminary Investigation of Wavefield Depth Extrapolation by Two-Way Wave Equations
International Journal of Geophysics, 2012 Most of the wavefield downward continuation migration approaches are relying on one-way wave equations, which move the seismic energy always in one direction along depth. The one-way downward continuation migrations only use the primaries for imaging and
Bangyu Wu, Ru-Shan Wu, Jinghuai Gao
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