Relevant bibliographies by topics / Electromagnetic geophysics

Academic literature on the topic 'Electromagnetic geophysics'

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Published: 4 June 2021
Last updated: 20 February 2023

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Journal articles on the topic "Electromagnetic geophysics"

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Weiss, Chester J., G. Didem Beskardes, Kris MacLennan, Michael J. Wilt, Evan Schankee Um, and Don C. Lawton. "Observing and modeling the effects of production infrastructure in electromagnetic surveys." Leading Edge 41, no. 2 (February 2022): 100–106. http://dx.doi.org/10.1190/tle41020100.1.

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Electromagnetic (EM) methods are among the original techniques for subsurface characterization in exploration geophysics because of their particular sensitivity to the earth electrical conductivity, a physical property of rocks distinct yet complementary to density, magnetization, and strength. However, this unique ability also makes them sensitive to metallic artifacts — infrastructure such as pipes, cables, and other forms of cultural clutter — the EM footprint of which often far exceeds their diminutive stature when compared to that of bulk rock itself. In the hunt for buried treasure or unexploded ordnance, this is an advantage; in the long-term monitoring of mature oil fields after decades of production, it is quite troublesome indeed. Here we consider the latter through the lens of an evolving energy industry landscape in which the traditional methods of EM characterization for the exploration geophysicist are applied toward emergent problems in well-casing integrity, carbon capture and storage, and overall situational awareness in the oil field. We introduce case studies from these exemplars, showing how signals from metallic artifacts can dominate those from the target itself and impose significant burdens on the requisite simulation complexity. We also show how recent advances in numerical methods mitigate the computational explosivity of infrastructure modeling, providing feasible and real-time analysis tools for the desktop geophysicist. Lastly, we demonstrate through comparison of field data and simulation results that incorporation of infrastructure into the analysis of such geophysical data is, in a growing number of cases, a requisite but now manageable step.
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Høyer, Anne-Sophie, Ingelise Møller, and Flemming Jørgensen. "Challenges in geophysical mapping of glaciotectonic structures." GEOPHYSICS 78, no. 5 (September 1, 2013): B287—B303. http://dx.doi.org/10.1190/geo2012-0473.1.

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Glaciotectonic complexes have been recognized worldwide — traditionally described on the basis of outcrops or geomorphological observations. In the past few decades, geophysics has become an integral part of geologic mapping, which enables the mapping of buried glaciotectonic complexes. The geophysical methods provide different types of information and degrees of resolution and thus, a different ability to resolve the glaciotectonic structures. We evaluated these abilities on the basis of an integrated application of four commonly used geophysical methods: airborne transient electromagnetics, high-resolution reflection seismic, geoelectrical, and ground-penetrating radar (GPR). We covered an area of [Formula: see text] in a formerly glaciated region in the western part of Denmark. The geologic setting was highly heterogeneous with glaciotectonic deformation observed in the form of large-scale structures in the seismic and airborne transient electromagnetic data to small-scale structures seen in the GPR and geoelectrical data. The seismic and GPR data provided detailed structural information, whereas the geoelectrical and electromagnetic data provided indirect lithological information through resistivities. A combination of methods with a wide span in resolution capabilities can therefore be recommendable to characterize and understand the geologic setting. The sequence of application of the different methods is primarily determined by the gross expenditure required for acquisition and processing, e.g., per kilometer of the surveys. Our experience suggested that airborne electromagnetic data should be acquired initially to obtain a 3D impression of the geologic setting. Based on these data, areas can be selected for further investigation with the more detailed but also more expensive and time-consuming methods.
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Doyle, H. "Geophysics in Australia." Earth Sciences History 6, no. 2 (January 1, 1987): 178–204. http://dx.doi.org/10.17704/eshi.6.2.386k258604262836.

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Geophysical observations began in Australia with the arrival of the first European explorers in the late 18th Century and there have been strong connections with European and North American geophysics ever since, both in academic and exploration geophysics. Government institutions, particularly the Bureau of Mineral Resources, have played a large part in the development of the subject in Australia, certainly more so than in North America. Academic research in geophysics has been dominated by that at the Australian National University. Palaeomagnetic research at the Australian National University has been particularly valuable, showing the large northerly drift of the continent in Cainozoic times as part of the Australia-India plate. Heat flow, electrical conductivity and upper mantle seismic velocities have been shown to be significantly different between Phanerozoic eastern Australia and the Western Shield. Geophysical exploration for metals and hydrocarbons began in the 1920s but did not develop strongly until the 1950s and 1960s. There are relatively few Australian geophysical companies and contracting companies, and instrumentation from North America and Europe have played an important role in exploration. Exploration for metals has been hampered by the deep weathered mantle over much of the continent, but the development of pulsed (transient) electromagnetic methods, including an Australian instrument (SIROTEM), has improved the situation. Geophysics has been important in several discoveries of ore-bodies. In hydrocarbon exploration the introduction of common depth point stacking and digital recording and processing in reflection surveys have played an important part in the discovery of offshore and onshore fields, as in other countries.
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Young, Charles T. "Tabletop Models for Electrical and Electromagnetic Geophysics." Journal of Geoscience Education 50, no. 5 (November 2002): 594–601. http://dx.doi.org/10.5408/1089-9995-50.5.594.

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Zhdanov, Michael S. "Electromagnetic geophysics: Notes from the past and the road ahead." GEOPHYSICS 75, no. 5 (September 2010): 75A49–75A66. http://dx.doi.org/10.1190/1.3483901.

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During the last century, electrical geophysics has been transformed from a simple resistivity method to a modern technology that uses complex data-acquisition systems and high-performance computers for enhanced data modeling and interpretation. Not only the methods and equipment have changed but also our ideas about the geoelectrical models used for interpretation have been modified tremendously. This paper describes the evolution of the conceptual and technical foundations of EM methods. It outlines a framework for further development, which should focus on multitransmitter and multireceiver surveys, analogous to seismic data-acquisition systems. Important potential topics of future research efforts are in the areas of multidimensional modeling and inversion, including a new approach to the formulation and understanding of EM fields based on flux and voltage representation, which corresponds well to geophysical experiments involving the measurement of voltage and flux of electric and magnetic fields.
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Greenhouse, John P., and David D. Slaine. "Geophysical modelling and mapping of contaminated groundwater around three waste disposal sites in southern Ontario." Canadian Geotechnical Journal 23, no. 3 (August 1, 1986): 372–84. http://dx.doi.org/10.1139/t86-052.

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We present an approach to the use of electomagnetic geophysical methods for delineating groundwater contamination, and test the concepts at three waste disposal sites. The approach includes a technique for modelling a site's response to a variety of instruments, and a device-independent method of contouring the data. The modelling attempts to account for the noise inherent in the measurement process, particularly the effects of lateral variations in stratigraphy. These concepts are evaluated by comparing the geophysical response to groundwater conductivities measured in sampling wells. We conclude that geophysics offers a cost-effective supplement to drilling, and that it is best used in a reconnaissance mode to map the general distribution of contamination prior to a detailed sampling program. The correlation between the observed and predicted geophysical response as a function of groundwater conductivity is as good as can be expected given the uncertainties in the process. The methodology proposed is simple to use and practical. Key words: groundwater, contamination, geophysics, electromagnetic, mapping, modelling.
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Parshin, Alexander, Ayur Bashkeev, Yuriy Davidenko, Marina Persova, Sergey Iakovlev, Sergey Bukhalov, Nikolay Grebenkin, and Marina Tokareva. "Lightweight Unmanned Aerial System for Time-Domain Electromagnetic Prospecting—The Next Stage in Applied UAV-Geophysics." Applied Sciences 11, no. 5 (February 26, 2021): 2060. http://dx.doi.org/10.3390/app11052060.

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Nowadays in solving geological problems, the technologies of UAV-geophysics, primarily magnetic and gamma surveys, are being increasingly used. However, for the formation of the classical triad of airborne geophysics methods in the UAV version, there was not enough technology for UAV-electromagnetic sounding, which would allow studying the geological environment at depths of tens and hundreds of meters with high detail. This article describes apparently the first technology of UAV-electromagnetic sounding in the time domain (TDEM, TEM), implemented as an unmanned system based on a light multi-rotor UAV. A measuring system with an inductive sensor—an analogue of a 20 × 20 or 50 × 50 m receiving loop is towed by a UAV, and a galvanically grounded power transmitter is on the ground and connected to a pulse generator. The survey is carried out along a network of parallel lines at low altitude with a terrain draping at a speed of 7–8 m/s, the maximum distance of the UAV’s departure from the transmitter line can reach several kilometers, thus the created technology is optimal for performing detailed areal electromagnetic soundings in areas of several square kilometers. The results of the use of the unmanned system (UAS) in real conditions of the mountainous regions of Eastern Siberia are presented. Based on the obtained data, the sensitivity of the system was simulated and it was shown that the developed technology allows one to collect informative data and create geophysical sections and maps of electrical resistivity in various geological situations. According to the authors, the emergence of UAV-TEM systems in the near future will significantly affect the practice of geophysical work, as it was earlier with UAV-magnetic prospecting and gamma-ray survey.
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Chave, Alan D., and John R. Booker. "Electromagnetic induction studies." Reviews of Geophysics 25, no. 5 (1987): 989. http://dx.doi.org/10.1029/rg025i005p00989.

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WANNAMAKER, PHILIP E., and GERALD W. HOHMANN. "Electromagnetic Induction Studies." Reviews of Geophysics 29, S1 (January 1991): 405–15. http://dx.doi.org/10.1002/rog.1991.29.s1.405.

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Everett, M. E., and A. D. Chave. "Energy flow in terrestrial controlled-source electromagnetic geophysics." European Journal of Physics 40, no. 6 (September 18, 2019): 065202. http://dx.doi.org/10.1088/1361-6404/ab3de5.

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Dissertations / Theses on the topic "Electromagnetic geophysics"

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Linde, Niklas. "Characterization of Hydrogeological Media Using Electromagnetic Geophysics." Doctoral thesis, Uppsala universitet, Geofysik, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-5912.

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Radio magnetotellurics (RMT), crosshole ground penetrating radar (GPR), and crosshole electrical resistance tomography (ERT) were applied in a range of hydrogeological applications where geophysical data could improve hydrogeological characterization. A profile of RMT data collected over highly resistive granite was used to map subhorizontal fracture zones below 300m depth, as well as a steeply dipping fracture zone, which was also observed on a coinciding seismic reflection profile. One-dimensional inverse modelling and 3D forward modelling with displacement currents included were necessary to test the reliability of features found in the 2D models, where the forward models did not include displacement currents and only lower frequencies were considered. An inversion code for RMT data was developed and applied to RMT data with azimuthal electrical anisotropy signature collected over a limestone formation. The results indicated that RMT is a faster and more reliable technique for studying electrical anisotropy than are azimuthal resistivity surveys. A new sequential inversion method to estimate hydraulic conductivity fields using crosshole GPR and tracer test data was applied to 2D synthetic examples. Given careful surveying, the results indicated that regularization of hydrogeological inverse problems using geophysical tomograms might improve models of hydraulic conductivity. A method to regularize geophysical inverse problems using geostatistical models was developed and applied to crosshole ERT and GPR data collected in unsaturated sandstone. The resulting models were geologically more reasonable than models where the regularization was based on traditional smoothness constraints. Electromagnetic geophysical techniques provide an inexpensive data source in estimating qualitative hydrogeological models, but hydrogeological data must be incorporated to make quantitative estimation of hydrogeological systems feasible.
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Mallan, Robert Keays 1968. "Model studies of radio frequency electromagnetic geotomography." Thesis, The University of Arizona, 1996. http://hdl.handle.net/10150/278551.

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The objectives of this research were to provide accurate geotomography data and to subsequently use these data to investigate the ability of a two dimensional (2-D), rigorous wave equation model to describe the data. This was approached by constructing a physical, scale model EM tomography system to make measurements over a known, controllable medium. These data were used in the evaluation of a 2-D, exact, integral wave equation model as part of a reconstruction algorithm to image the conductivity and permittivity distribution of the planar region under investigation. Measured data exhibited precision, symmetry and repeatability, and also accuracy in determining the conductivity and permittivity of an aqueous solution. Analysis of the data indicates that the tomography system can detect and accurately locate a target. Adjustments in the 2-D mathematical model were needed in order to accurately fit the radiation pattern of the electric dipole antenna used in the physical scale model. Subsequently, the 2-D model was able to successfully describe tomography data over a 2-D target.
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Johansson, Linnéa. "Modelling and interpretation of VTEM data from Soppero, Sweden." Thesis, Luleå tekniska universitet, Geovetenskap och miljöteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-64879.

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The geological and geophysical knowledge about the northernmost part of Sweden has recently increased due to the Barents project, which includes acquisition of modern geophysical and geological information on behalf of the Swedish Geological Survey (SGU). During August 2013, a helicopter-borne versatile time domain electromagnetic (VTEM) survey was performed by Geotech Ltd, in the Soppero area northeast of Kiruna. From the VTEM measurements, a number of TEM anomalous zones have been identified and two of them are located south and southeast of the Lannavaara village. The main conductive features in the Lannavaara area can be explained by the presence of graphitic schist, which is spatially associated with a number of sulphide and iron oxide mineralisation occurrences. In this project, Maxwell thin sheet modelling and EM Flow conductivity-depth-imaging (CDI) software have been applied to selected anomalies in the Lannavaara area, for the purpose of extracting geometrical parameters of conductive features. This information has been used in order to confirm the structural framework of the area and evaluate the utility of VTEM measurements in this geological environment. In general, Maxwell thin sheet models of anomalies with small amplitudes show a better correlation with existing drill holes than models of anomalies with large amplitudes. The use of small amplitudes managed to confirm the structural model in the central part of the investigated area, which is an anticline. However, the use of different models and their distribution across the area is limited. Compared with Maxwell, CDIs from EM Flow provided a better way of confirming the general structural model in the area, although they include artefacts due to strong lateral gradients in conductivity. The Lannavaara area has also been investigated by VLF, Slingram and magnetic measurements and based on these data, multivariate analysis in SiroSOM reveals a strong correlation between VTEM and Slingram data, while VLF data appears to have much less or more complicated correlation with the other data sets. In summary, the results from the various software raise a question about the geological complexity in parts of the Lannavaara area, which may include multiple layers of graphitic schist, possibly expressed as smooth transitions in conductivity when represented by data from electromagnetic methods.
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Shank, Jared Wyatt. "A geophysical investigation to locate missing graves utilizing ground penetrating radar, electromagnetic, and magnetic methods." Wright State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=wright1389704983.

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Torikka, Niklas. "3D Modelling of TEM Data : from Rajapalot Gold-Cobalt prospect, northern Finland." Thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-75756.

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The Rajapalot gold-cobalt project in northern Finland is an exciting, relatively new discovery, still being explored with hopes to start mining in the future. The area was found by a IP/Resistivity survey in 2013. Extensive geophysical follow-up surveys have delineated several electromagnetic targets, one of which, named Raja, is the target anomaly this master thesis is built upon. A TEM survey was carried out during late August to early September 2018. The data collected was analyzed, processed and later modelled in Maxwell using Leroi, a CSIRO module. Three separate models are produced with one, two, and three plates respectively. The result is compared to existing VTEM and resistivity models.
Rajapalot guld-kobolt-projektet i norra Finland är en spännande, relativt ny upptäckt som fortfarande undersöks med hopp om att starta gruvbrytning i framtiden. Området upptäcktes via en IP/Resistivitets-undersökning under 2013. Omfattande geofysiska undersökningar har avgränsat flera elektromagnetiska anomalier, varav en, döpt Raja, är den anomali som den här masteruppsatsen är uppbyggd kring. En TEM-undersökning utfördes under slutet av augusti, början av september 2018. Insamlade data analyserades, bearbetades och modellerades senare i Maxwell med hjälp av Leroi, en insticksmodul från CSIRO. Tre separata modeller togs fram med respektive, en, två, och tre plattor. Resultatet jämfördes mot befintliga VTEM-, och resistivitetsmodeller.
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Nassar, Elias M. "Numerical and experimental studies of electromagnetic scattering from sea ice/." The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487948440826275.

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Thunehed, Hans. "Two topics related to interpretation of transient electromagnetic measurements." Licentiate thesis, Luleå tekniska universitet, 1997. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26657.

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Cassidy, Nigel John. "The application of mathematical modelling in the interpretation of near-surface archaeological ground-penetrating radar." Thesis, Keele University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.344057.

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Debroux, Patrick Serge 1957. "A numerical electromagnetic study of shallow geophysical targets." Diss., The University of Arizona, 1997. http://hdl.handle.net/10150/288769.

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Prediction of the response of high-frequency induction survey tools to 3-dimensional targets is needed to aid in tool and survey design, in the interpretation of data, and to analyze the interaction of the individual field components with the target of interest. To this end, two numerical algorithms (TSAR and NEC) were imported and adapted to solve geophysical electromagnetic problems. A third algorithm (EM1DSH) was used to quantitatively analyze the role of current channeling on the response of shallow targets, and to verify that the TSAR and NEC algorithms include the important effect of current channeling in their solution. TSAR (a finite difference time-domain algorithm) proved successful in modeling the ellipticity response of a vertical magnetic dipole placed over a homogenous and layered lossy dielectric as compared to published data in the 500 kHz to 30 MHz range. Cell-size versus accuracy analyses show that little accuracy gains are made with a reduction of cell-size past the one-tenth effective wavelength modeling guideline. NEC (a method-of-moments algorithm) shows substantial but limited success in modeling the response of small loop antennas to perfectly and near-perfectly conducting geophysical targets (conductivity and permeability) in the 6.4 kHz to 8 MHz range. Comparison of NEC results are made with analytic results, fields data, and other numerical algorithms. NEC shows substantial numerical error at lower frequencies due to the effective lengths (in wavelengths) of the wire segments used. Also, the Green's function look-up table used to interpolate the effect of half-space on target response is not optimized for the geophysical problem which can lead to substantial solution error at lower (kHz) frequencies. An integral equation solution (EM1DSH) analysis shows that the quantitative effect of increasing background conductivity (which affects both current channeling and target response) on the secondary field response of a buried thin-sheet can be greater than 120 percent in the geophysical induction range. Target parameter changes show current channeling to be greatest for targets that are shallow, that are horizontal, and have a large dimensional aspect ratio. Target and survey parameter sensitivity analyses help to understand the relationship of these parameters to current channeling.
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Barongo, Justus Obiko. "Application of transient airborne electromagnetic and ground resistivity methods to geological mapping in tropical terrains." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75983.

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The feasibility of using time-domain airborne electromagnetic and ground resistivity methods in geological mapping in tropical terrains is investigated. The investigation is based upon evaluation of the linear inverse theory in the determination of physical parameters of the weathered layer necessary for interpretation of underlying lithology.
Inversion of ground resistivity sounding data from the greenstone belt in western Kenya yields conductivities and thicknesses that are consistent with geology. A similar inversion of modelled time-domain airborne electromagnetic data shows that conductivity, thickness and depth to the top of the conductive weathered layer can be uniquely determined if its response does not suffer the thin sheet response problem. The results further show that this problem can be quite common in tropical regions since much of the weathered layer has low conductivity and thickness and, consequently, the response is weak. In this situation, conductivity and thickness are correlated and conductivity-thickness product is better determined than these two parameters independently.
By virtue of the weak time-domain AEM response of the weathered layer, much of the response remains buried in noise. This situation introduces further complications for an inverse problem that is highly non-linear. A method for reducing some of this noise before carrying out the inversion is presented.
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Books on the topic "Electromagnetic geophysics"

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P, Hoekstra, ed. Electromagnetic soundings. Amsterdam: Elsevier Science B.V., 2001.

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author, Hayakawa Masashi, ed. Ultra and extremely low frequency electromagnetic fields. Tokyo: Springer, 2014.

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Roy, Kalyan Kumar. Natural Electromagnetic Fields in Pure and Applied Geophysics. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-38097-7.

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Zhdanov, Mikhail Semenovich. Integral transforms in geophysics. Berlin: Springer-Verlag, 1988.

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Kalinski, Michael E. Application of electromagnetic geophysics (EMG) technology to subsurface investigations. [Madison, WI]: Wisconsin Highway Research Program, 2005.

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Handbook of geophysics and archaeology. London, U.K: Equinox Pub., 2004.

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Zhdanov, M. S. Integral transforms in geophysics. Berlin: Springer-Verlag, 1987.

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Martyshko, P. S. Inverse problems of electromagnetic geophysical fields. Utrecht, The Netherlands: VSP, 1999.

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Gordienko, V. I. Modelirovanie ėlektromagnitnykh poleĭ v morskoĭ srede. Kiev: Nauk. dumka, 1988.

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Chadaev, M. S. Gravimetrii︠a︡, magnitometrii︠a︡, geomorfologii︠a︡ i ikh parametricheskie svi︠a︡zi: Monografii︠a︡. Permʹ: Redakt︠s︡ionno-izdatelʹskiĭ otdel Permskogo gosudarstvennogo nat︠s︡ionalʹnogo issledovatelskogo universiteta, 2012.

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Book chapters on the topic "Electromagnetic geophysics"

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Christensen, Niels Bøie. "Electromagnetic methods." In Engineering Geophysics, 77–85. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003184676-7.

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Siemon, Bernhard. "Electromagnetic methods – frequency domain." In Groundwater Geophysics, 155–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-88405-7_5.

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Zhdanov, Michael S. "Migration of the Electromagnetic Field." In Integral Transforms in Geophysics, 284–303. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-72628-6_10.

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Zhdanov, Michael S. "Analytical Continuation of the Electromagnetic Field." In Integral Transforms in Geophysics, 262–83. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-72628-6_9.

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Lakhina, G. S., and B. T. Tsurutani. "Electromagnetic Pulsations and Magnetic Storms." In Encyclopedia of Solid Earth Geophysics, 1–6. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-10475-7_156-1.

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Whaler, Kathryn A. "Electromagnetic Methods, Imaging Magma Bodies." In Encyclopedia of Solid Earth Geophysics, 1–5. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-10475-7_271-1.

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Lakhina, Gurbax S., and Bruce T. Tsurutani. "Magnetic Storms and Electromagnetic Pulsations." In Encyclopedia of Solid Earth Geophysics, 792–96. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-90-481-8702-7_156.

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Franzina, Giovanni. "Electromagnetic Hypogene Co-seismic Sources." In Applied Mathematical Problems in Geophysics, 125–56. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-05321-4_5.

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Lakhina, G. S., and B. T. Tsurutani. "Electromagnetic Pulsations and Magnetic Storms." In Encyclopedia of Solid Earth Geophysics, 354–59. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-58631-7_156.

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Whaler, Kathryn A. "Electromagnetic Methods, Imaging Magma Bodies." In Encyclopedia of Solid Earth Geophysics, 350–54. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-58631-7_271.

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Conference papers on the topic "Electromagnetic geophysics"

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Korepanov, V., Y. Klymovych, and L. Rakhlin. "Electromagnetic Instrumentation – New Developments For Geophysics." In Geophysics of the 21st Century - The Leap into the Future. European Association of Geoscientists & Engineers, 2003. http://dx.doi.org/10.3997/2214-4609-pdb.38.f140.

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Xiao, Zhanshan, Haitao Hu, Rongxin Zhang, Qingjie Bai, and Jianbin Zhao. "Numerical simulation study of transient electromagnetic far field detection logging." In 2nd SEG Borehole Geophysics Workshop. Society of Exploration Geophysicists, 2020. http://dx.doi.org/10.1190/bhgp2020-33.1.

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Won, I. J., Dean Keiswetter, and Elena Novikova. "Electromagnetic Induction Spectroscopy." In Symposium on the Application of Geophysics to Engineering and Environmental Problems 1998. Environment and Engineering Geophysical Society, 1998. http://dx.doi.org/10.4133/1.2922497.

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Haroon, A., S. Hölz, B. Weymer, B. Tezkan, and M. Jegen. "Calculating Time-Domain Controlled Source Electromagnetic Signals with MARE2DEM." In 3rd Applied Shallow Marine Geophysics Conference. Netherlands: EAGE Publications BV, 2018. http://dx.doi.org/10.3997/2214-4609.201802663.

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Parshin, A. V., S. V. Iakovlev, Yu A. Davidenko, A. S. Bashkeev, V. V. Vinokurov, and S. V. Bukhalov. "Two Variants of Lightweight Unmanned Systems for Low-Altitude Electromagnetic Soundings." In Engineering and Mining Geophysics 2021. European Association of Geoscientists & Engineers, 2021. http://dx.doi.org/10.3997/2214-4609.202152217.

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Kolesnikov, V. P., and T. A. Laskina. "Surface-to-Mine Electromagnetic Sounding in the Context of Salt Deposits." In Engineering and Mining Geophysics 2020. European Association of Geoscientists & Engineers, 2020. http://dx.doi.org/10.3997/2214-4609.202051035.

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Won, I. J., Dean Keiswetter, and Elena Novikova. "Electromagnetic Induction Spectroscopy." In 11th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems. European Association of Geoscientists & Engineers, 1998. http://dx.doi.org/10.3997/2214-4609-pdb.203.1998_016.

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Narciso, J., L. Azevedo, E. Van De Vijver, and M. Van Meirvenne. "Geostatistical Electromagnetic Inversion for Landfill Characterization." In NSG2020 26th European Meeting of Environmental and Engineering Geophysics. European Association of Geoscientists & Engineers, 2020. http://dx.doi.org/10.3997/2214-4609.202020154.

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Gisselø, P., P. Daoultzis, and E. Smart. "Deep Targeting With Airborne Electromagnetic Surveys." In NSG2022 3rd Conference on Airborne, Drone and Robotic Geophysics. European Association of Geoscientists & Engineers, 2022. http://dx.doi.org/10.3997/2214-4609.202220086.

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Belaya, A., A. V. Kuklin, G. M. Trigubovich, and A. V. Chernyshev. "High Space Density Time-Domain Electromagnetic Scanning for Ore and Engineering Exploration." In Engineering and Mining Geophysics 2021. European Association of Geoscientists & Engineers, 2021. http://dx.doi.org/10.3997/2214-4609.202152043.

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Reports on the topic "Electromagnetic geophysics"

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Daanen, R. P., A. M. Emond, Jordi Cristobal, B. J. Minsley, Anupma Prakash, Gwen Holdmann, A. K. Liljedahl, Katey Walter-Antony, V. E. Romanovsky, and D. L. Barnes. Permafrost remote sensing through airborne electromagnetic geophysics and thermal anomalies (presentation): 14th International Circumpolar Remote Sensing Symposium, Homer, Alaska, September 12-16, 2016. Alaska Division of Geological & Geophysical Surveys, September 2016. http://dx.doi.org/10.14509/29822.

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BARKHATOV, NIKOLAY, and SERGEY REVUNOV. A software-computational neural network tool for predicting the electromagnetic state of the polar magnetosphere, taking into account the process that simulates its slow loading by the kinetic energy of the solar wind. SIB-Expertise, December 2021. http://dx.doi.org/10.12731/er0519.07122021.

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Abstract:
The auroral activity indices AU, AL, AE, introduced into geophysics at the beginning of the space era, although they have certain drawbacks, are still widely used to monitor geomagnetic activity at high latitudes. The AU index reflects the intensity of the eastern electric jet, while the AL index is determined by the intensity of the western electric jet. There are many regression relationships linking the indices of magnetic activity with a wide range of phenomena observed in the Earth's magnetosphere and atmosphere. These relationships determine the importance of monitoring and predicting geomagnetic activity for research in various areas of solar-terrestrial physics. The most dramatic phenomena in the magnetosphere and high-latitude ionosphere occur during periods of magnetospheric substorms, a sensitive indicator of which is the time variation and value of the AL index. Currently, AL index forecasting is carried out by various methods using both dynamic systems and artificial intelligence. Forecasting is based on the close relationship between the state of the magnetosphere and the parameters of the solar wind and the interplanetary magnetic field (IMF). This application proposes an algorithm for describing the process of substorm formation using an instrument in the form of an Elman-type ANN by reconstructing the AL index using the dynamics of the new integral parameter we introduced. The use of an integral parameter at the input of the ANN makes it possible to simulate the structure and intellectual properties of the biological nervous system, since in this way an additional realization of the memory of the prehistory of the modeled process is provided.
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Wescott, Eugene M., and Davis D. Sentman. Geophysical Electromagnetic Sounding Using HAARP. Fort Belvoir, VA: Defense Technical Information Center, March 2002. http://dx.doi.org/10.21236/ada399992.

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Burns, L. E., G. R. C. Graham, J. D. Barefoot, Rebecca-Ellen Woods, and R. A. Pritchard. Chulitna electromagnetic and magnetic airborne geophysical survey. Alaska Division of Geological & Geophysical Surveys, March 2020. http://dx.doi.org/10.14509/30416.

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Emond, A. M., L. E. Burns, and G. R. C. Graham. Tonsina electromagnetic and magnetic airborne geophysical survey data compilation. Alaska Division of Geological & Geophysical Surveys, January 2015. http://dx.doi.org/10.14509/29169.

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Emond, A. M., L. E. Burns, and G. R. C. Graham. Tok electromagnetic and magnetic airborne geophysical survey data compilation. Alaska Division of Geological & Geophysical Surveys, 2015. http://dx.doi.org/10.14509/29347.

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Burns, L. E., G. R. C. Graham, and J. D. Barefoot. Liscum electromagnetic and magnetic airborne geophysical survey data compilation. Alaska Division of Geological & Geophysical Surveys, November 2019. http://dx.doi.org/10.14509/29755.

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Burns, L. E., J. D. Barefoot, and T. J. Naibert. Goodpaster electromagnetic and magnetic airborne geophysical survey data compilation. Alaska Division of Geological & Geophysical Surveys, March 2019. http://dx.doi.org/10.14509/29813.

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Burns, L. E., J. D. Barefoot, and T. J. Naibert. Wrangellia electromagnetic and magnetic airborne geophysical survey (data compilation). Alaska Division of Geological & Geophysical Surveys, April 2019. http://dx.doi.org/10.14509/29848.

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Burns, L. E., J. D. Barefoot, Rebecca-Ellen Woods, WGM Mining and Geological Consultants, Inc., and Dighem Surveys and Processing. Circle electromagnetic and magnetic airborne geophysical survey data compilation. Alaska Division of Geological & Geophysical Surveys, March 2019. http://dx.doi.org/10.14509/30167.

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