Relevant bibliographies by topics / Geomagnetic depth sounding

Academic literature on the topic 'Geomagnetic depth sounding'

Author: Grafiati
Published: 10 December 2022
Last updated: 6 September 2023

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Journal articles on the topic "Geomagnetic depth sounding"

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Armadillo, E., E. Bozzo, V. Cerv, A. De Santis, D. Di Mauro, M. Gambetta, A. Meloni, J. Pek, and F. Speranza. "Geomagnetic depth sounding in the Northern Apennines (Italy)." Earth, Planets and Space 53, no. 5 (May 2001): 385–96. http://dx.doi.org/10.1186/bf03352395.

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Li, Shiwen, and Yunhe Liu. "Wavelet-Based Three-Dimensional Inversion for Geomagnetic Depth Sounding." Magnetochemistry 8, no. 12 (December 12, 2022): 187. http://dx.doi.org/10.3390/magnetochemistry8120187.

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The complexity of Earth’s structure poses a challenge to the multiscale detection capability of geophysics. In this paper, we present a new wavelet-based three-dimensional inversion method for geomagnetic depth sounding. This method is based on wavelet functions to transfer model parameters in the space domain into the wavelet domain. The model is represented by wavelet coefficients containing both large- and fine-scale information, enabling wavelet-based inversion to describe multiscale anomalies. L1-norm measurement is applied to measure the model roughness to accomplish the sparsity constraint in the wavelet domain. Meanwhile, a staggered-grid finite difference method in a spherical coordinate system is used to calculate the forward responses, and the limited-memory quasi-Newton method is applied to seek the solution of the inversion objective function. Inversion tests of synthetic data for multiscale models show that wavelet-based inversion is stable and has multiresolution. Although higher-order wavelets can lead to finer results, our tests present that a db6 wavelet is suitable for geomagnetic depth sounding inversion. The db6 inversion results of responses at 129 geomagnetic observatories around the world reveal a higher-resolution image of the mantle.
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Neska, Anne, Jan Tadeusz Reda, Mariusz Leszek Neska, and Yuri Petrovich Sumaruk. "On the relevance of source effects in geomagnetic pulsations for induction soundings." Annales Geophysicae 36, no. 2 (March 7, 2018): 337–47. http://dx.doi.org/10.5194/angeo-36-337-2018.

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Abstract. This study is an attempt to close a gap between recent research on geomagnetic pulsations and their usage as source signals in electromagnetic induction soundings (i.e., magnetotellurics, geomagnetic depth sounding, and magnetovariational sounding). The plane-wave assumption as a precondition for the proper performance of these methods is partly violated by the local nature of field line resonances which cause a considerable portion of pulsations at mid latitudes. It is demonstrated that and explained why in spite of this, the application of remote reference stations in quasi-global distances for the suppression of local correlated-noise effects in induction arrows is possible in the geomagnetic pulsation range. The important role of upstream waves and of the magnetic equatorial region for such applications is emphasized. Furthermore, the principal difference between application of reference stations for local transfer functions (which result in sounding curves and induction arrows) and for inter-station transfer functions is considered. The preconditions for the latter are much stricter than for the former. Hence a failure to estimate an inter-station transfer function to be interpreted in terms of electromagnetic induction, e.g., because of field line resonances, does not necessarily prohibit use of the station pair for a remote reference estimation of the impedance tensor.
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Li, Shiwen, Yunhe Liu, and Jianping Li. "A Mantle Plume Beneath South China Revealed by Electrical Conductivity Obtained from Three-Dimensional Inversion of Geomagnetic Data." Sensors 23, no. 3 (January 21, 2023): 1249. http://dx.doi.org/10.3390/s23031249.

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A three-dimensional electrical conductivity model of the mantle beneath South China is presented using the geomagnetic depth sounding method in this paper. The data misfit term in the inversion function is measured by the L1-norm to suppress the instability caused by large noises contained in the observed data. To properly correct the ocean effect in responses at coastal observatories, a high-resolution (1° × 1°) heterogeneous and fixed shell is included in inversion. The most striking feature of the obtained model is a continuous high-conductivity anomaly that is centered on ~(112° E, 27° N) in the mantle. The average conductivity of the anomaly appears to be two to four times higher than that of the global average models at the most sensitive depths (410–900 km) of geomagnetic depth sounding. Further analysis combining laboratory-measured conductivity models with the observed conductivity model shows that the anomaly implies excess temperature in the mantle. This suggests the existence of a mantle plume, corresponding to the Hainan plume, that originates in the lower mantle, passes through the mantle transition zone, and enters the upper mantle. Our electrical conductivity model provides convincing evidence for the mantle plume beneath South China.
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Hanchinal, A. N., P. B. V. Subba Rao, Nandini Nagarajan, D. R. K. Rao, and B. P. Singh. "Geomagnetic depth sounding over the Singhbhum and the surrounding regions of eastern India." Journal of Earth System Science 103, no. 3 (September 1994): 383–400. http://dx.doi.org/10.1007/bf02841528.

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Zhang, Yanhui, and Yue Yang. "Three-dimensional inversion resolution in detecting stagnant slabs using a dense geomagnetic depth sounding method." Physics of the Earth and Planetary Interiors 333 (December 2022): 106955. http://dx.doi.org/10.1016/j.pepi.2022.106955.

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Zhang, Yanhui, Yue Yang, Xueqiu Wang, Shiwen Li, and Aihua Weng. "C-responses estimation of geomagnetic depth sounding using regularization method and its application in Northeast China." Journal of Applied Geophysics 195 (December 2021): 104475. http://dx.doi.org/10.1016/j.jappgeo.2021.104475.

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Li, Shiwen, and Yunhe Liu. "Cold and Wet Mantle Transition Zone beneath the Mediterranean Sea Revealed by the Electrical Image." Applied Sciences 13, no. 2 (January 4, 2023): 689. http://dx.doi.org/10.3390/app13020689.

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A three-dimensional electrical conductivity model of the mantle beneath North Africa and Southern Europe is obtained by geomagnetic depth sounding. C-responses are estimated from geomagnetic data observed at observatories in and around the region and converted to the electrical structure of the mantle transition zone. The limited-memory quasi-Newton method is chosen to minimize the nonlinear objective function of inversion, while the forward modeling relies on a staggered-grid finite difference method in the spherical coordinate system. The data misfit term of the inversion function is measured using the L1-norm in order to suppress the response instability caused by the significant noise contained in the observed data. In order to adequately correct the ocean effect in observatories near the coast, a fixed shell comprised of ocean and land is incorporated in inversion. A banded zone with reduced conductivity is present in the three-dimensional model, primarily seen in the lower mantle transition zone and lower mantle beneath the Mediterranean Sea. Combining laboratory-measured conductivity models, we propose that subducted slabs causing reduced temperature and a water reservoir in the mantle transition zone should be responsible for the observed electrical model.
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Banerjee, B., P. B. V. Subba Rao, Gautam Gupta, E. J. Joseph, and B. P. Singh. "Results from a magnetic survey and geomagnetic depth sounding in the post-eruption phase of the Barren Island volcano." Earth, Planets and Space 50, no. 4 (April 1998): 327–38. http://dx.doi.org/10.1186/bf03352119.

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Guo, Junhao, Xinbao Lian, and Xueqiu Wang. "Electrical Conductivity Evidence for the Existence of a Mantle Plume Beneath Tarim Basin." Applied Sciences 11, no. 3 (January 20, 2021): 893. http://dx.doi.org/10.3390/app11030893.

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This paper proposes using a simulated annealing (SA) calculation to perform one-dimensional inversion of Geomagnetic Depth Sounding (GDS) to obtain the conductivity information of the lower mantle beneath the Tarim area, to calculate the temperature of the lower mantle according to the relevant formula of the petrophysical experiment, and to provide evidence of the existence of the Tarim mantle plume. The data used for inversion originate from the China Geomagnetic Network Center. This article uses theoretical data to prove that the simulated annealing algorithm can invert the true conductivity model when the data do not contain noise. However, when the data contain noise, it is more accurate to use the statistical expected value of the high-quality conductivity model during the simulated annealing inversion process as the optimal conductivity model rather than the classic simulated annealing algorithm. The simulated annealing inversion results of only four stations in Tarim area show that the conductivity of the top of the lower mantle and the upper part of the mantle transition zone in Tarim area is higher than the global average, and it is speculated that the temperature is 150k–450k higher than the global average. This is important evidence for the existence of the mantle plume beneath the Tarim Basin.
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Dissertations / Theses on the topic "Geomagnetic depth sounding"

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Fon, Lawrence Teku Verfasser], Andreas [Akademischer Betreuer] Hoerdt, and Cynthia A. [Akademischer Betreuer] [Volkert. "Magnetotellurics and Geomagnetic Depth Sounding in Queensland, South Eastern Australia -Evidence for the Tasman Line? / Lawrence Teku Fon. Gutachter: Andreas Hoerdt ; Cynthia Volkert. Betreuer: Andreas Hoerdt." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2011. http://d-nb.info/1043665552/34.

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Fon, Lawrence Teku. "Magnetotellurics and Geomagnetic Depth Sounding in Queensland, South Eastern Australia -Evidence for the Tasman Line?" Doctoral thesis, 2011. http://hdl.handle.net/11858/00-1735-0000-0006-B538-D.

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Gill, R. M. "A magnetotelluric profile across the Broken Hill and Olary Domains." Thesis, 2002. http://hdl.handle.net/2440/113040.

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This item is only available electronically.
Seventeen magnetotelluric survey sites were occupied across the Olary and Broken Hill Domains in the Curnamona Province, Australia. Two dimensional modelling along the magnetotelluric profile identifies the Broken Hill Domain as a zone of high electrical resistivity to a depth of 15km. Gravity modelling along a coincident profile has also shown the Broken Hill Domain to be significantly more dense than its surrounds. Seismic data have provided evidence of numerous faults and shear zones within the Pre-cambrian Broken Hill Domain basement, and is indicative of compression during the Delamarian Orogeny. It is proposed that the majority of crustal fluids were removed from these rocks by granulite facies metamorphism and tectonic compression. The boundary of the Olary Domain appears to be delineated by the Mundi Mundi Fault with an order of magnitude increase in resistivity on the Broken Hill side. The location of the Flinders Conductivity Anomaly was also observed and a number of conducting mechanisms considered, including crustal fluids and graphite films.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2002
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Books on the topic "Geomagnetic depth sounding"

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India. Dept. of Science and Technology. and Indian Institute of Geomagnetism, eds. Geomagnetic depth sounding with ocean bottom magnetometers: Marine geoelectromagnetic study of deep sea fans of the Bay of Bengal. Bombay: Indian Institute of Geomagnetism, 1991.

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K, Rao D. R., ed. Geophysical studies of the archaean lithosphere of Karnataka and Singhbhum through geomagneticic depth sounding. Bombay: Indian Institute of Geomagnetism, 1994.

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Book chapters on the topic "Geomagnetic depth sounding"

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Roy, Kalyan Kumar. "Geomagnetic Depth Sounding (GDS)." In Natural Electromagnetic Fields in Pure and Applied Geophysics, 371–419. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-38097-7_7.

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Conference papers on the topic "Geomagnetic depth sounding"

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Vitorello*, Ícaro, Marcelo B. de Pádua, Antonio L. Padilha, Sérgio L. Fontes, Reinhardt A. Fuck, Andrea C. Lima Santos, Mauricio S. Bologna, Walter E. de Medeiros, and Marcelo Furlan. "2011-INCTET Progress Report on Magnetotelluric and Geomagnetic Depth Soundings in the Borborema Province and Adjacent Terrains, NE Brazil." In 12th International Congress of the Brazilian Geophysical Society & EXPOGEF, Rio de Janeiro, Brazil, 15-18 August 2011. Society of Exploration Geophysicists and Brazilian Geophysical Society, 2011. http://dx.doi.org/10.1190/sbgf2011-075.

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