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Dissertations / Theses on the topic 'Magnetotellurik'

Author: Grafiati

Published: 4 June 2021

Last updated: 18 February 2022

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1

Wilhelms, Wenke. "Development of a three-dimensional all-at-once inversion approach for the magnetotelluric method." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2016. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-207548.

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A three-dimensional inversion was implemented for magnetotellurics, which is a passive electromagnetic method in geophysics. It exploits natural electromagnetic fields of the Earth, which function as sources. Their interaction with the conductive parts of the subsurface are registered when components of the electric and the magnetic field are measured and evaluated. The all-at-once approach is an inversion scheme that is relatively new to geophysics. In this approach, the objective function – the basis of each inversion – is called the Lagrangian. It consists of three parts: (i) the data resid

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2

Chen, Xiaoming. "Two-dimensional constrained anisotropic inversion of magnetotelluric data." Phd thesis, Universität Potsdam, 2012. http://opus.kobv.de/ubp/volltexte/2012/6316/.

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Tectonic and geological processes on Earth often result in structural anisotropy of the subsurface, which can be imaged by various geophysical methods. In order to achieve appropriate and realistic Earth models for interpretation, inversion algorithms have to allow for an anisotropic subsurface. Within the framework of this thesis, I analyzed a magnetotelluric (MT) data set taken from the Cape Fold Belt in South Africa. This data set exhibited strong indications for crustal anisotropy, e.g. MT phases out of the expected quadrant, which are beyond of fitting and interpreting with standard isotr

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3

Hoffmann-Rothe, Arne. "Combined structural and magnetotelluric investigation across the West Fault Zone in northern Chile." Phd thesis, [S.l.] : [s.n.], 2002. http://pub.ub.uni-potsdam.de/2002/0025/ahoro.pdf.

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4

Franke-Börner, Antje. "Three-dimensional finite element simulation of magnetotelluric fields on unstructured grids." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2013. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-114985.

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In der vorliegenden Arbeit werden verschiedene Randwertprobleme zur Beschreibung der Ausbreitung magnetotellurischer Felder mit Hilfe der Finite-Elemente-Methode numerisch gelöst. Die zwei- und dreidimensionalen Randwertprobleme zur Simulation des elektrischen oder des magnetischen Feldes, des magnetischen Vektorpotentials und des elektrischen Skalarpotentials, des magnetischen Vektorpotentials allein oder des anomalen magnetischen Vektorpotentials werden aus den Maxwell-Gleichungen hergeleitet. Auf Grundlage von Anwendung der Konvergenztheorie auf die Finite-Elemente-Lösung werden Konvergenzs

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5

Recher, Stephan. "Dreidimensionale Erkundung von Altlasten mit Radio-Magnetotellurik Vergleiche mit geophysikalischen, geochemischen und geologischen Analysen an Bodenproben aus Rammkernsondierungen /." [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=965795594.

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6

Maercklin, Nils. "Seismic structure of the Arava Fault, Dead Sea Transform." Phd thesis, [S.l.] : [s.n.], 2004. http://pub.ub.uni-potsdam.de/2004/0046/marcklin.pdf.

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7

Müller, Andreas [Verfasser]. "Magnetotellurik zur Identifizierung von tektonisch verursachten Änderungen des elektrischen Widerstandes : Modellierungen und neue Methoden der Auswertung ; ein Beitrag zum Deutsch-Türkischen Erdbeben-Forschungsprojekt / Andreas Müller. Deutsches GeoForschungsZentrum GFZ." Potsdam : Deutsches GeoForschungsZentrum GFZ, 2012. http://d-nb.info/1023445506/34.

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8

Medin, Ashley E. "The magnetotelluric inverse problem." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2008. http://wwwlib.umi.com/cr/ucsd/fullcit?p3336606.

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Thesis (Ph. D.)--University of California, San Diego, 2008.<br>Title from first page of PDF file (viewed January 5, 2009). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 202-208).

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9

Fridlund, Julia. "Processing of Noisy Controlled Source Audio Magnetotelluric (CSAMT) Data." Thesis, Uppsala universitet, Geofysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-396255.

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Controlled Source Audio Magnetotellurics (CSAMT) is a geophysical method for characterizing the resistivity of the subsurface with the help of electromagnetic waves. The method is used for various purposes, such as geothermal- and hydrocarbon exploration, mineral prospecting and for investigation of groundwater resources. Electromagnetic fields are created by running an alternating current in a grounded electric dipole and by varying the frequency, different depths can be targeted. Orthogonal components of the electromagnetic fields are measured at receiver stations a few kilometers away from

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10

Neukirch, Maik. "Non Stationary Magnetotelluric Data Processing." Doctoral thesis, Universitat de Barcelona, 2014. http://hdl.handle.net/10803/284932.

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Studies have proven that the desired signal for Magnetotellurics (MT) in the electromagnetic (EM) field can be regarded as 'quasi stationary' (i.e. sufficiently stationary to apply a windowed Fourier transform). However, measured time series often contain environmental noise. Hence, they may not fulfill the stationarity requirement for the application of the Fourier Transform (FT) and therefore may lead to false or unreliable results under methods that rely on the FT. In light of paucity of algorithms of MT data processing in the presence of non stationary noise, it is the goal of this thesis

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11

Nascimento, Darcy. "Magnetotelluric instrument development and application." Thesis, University of Edinburgh, 1997. http://hdl.handle.net/1842/15488.

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The magnetotelluric method (MT) has been used to study the conductivity structure of the earth. The method uses the time variations of the natural magnetic and the induced electric fields measured simultaneously at the earth's surface. The demand for new MT instrumentation has increased in the past few years. New applications require more complex sensor configurations. Characteristics like size, weight and real time data processing have become increasingly important to improve logistics and mobility, although it is becoming more and more difficult to measure electromagnetic fields without stro

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12

McNeice, Gary Wayne. "Magnetotelluric investigation of the Appalachians, Newfoundland, Canada." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0026/MQ36152.pdf.

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13

Bennett, Brian R. (Brian Robert). "A long-period magnetotelluric study in California." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/57627.

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14

Okazaki, Tomohisa. "Characteristics of Electrical Anisotropy in Magnetotelluric Responses." Kyoto University, 2018. http://hdl.handle.net/2433/232256.

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15

Whittall, Kenneth Patrick. "Exploring magnetotelluric nonuniqueness using inverse scattering methods." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/27563.

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I present two algorithms which solve the one-dimensional magnetotelluric (MT) problem of finding the electrical conductivity σ(z) as a function of depth in the earth. Together, these algorithms restrict and explore the nonuniqueness of the nonlinear MT inverse problem. They accept constraints which limit the space of acceptable conductivity models and they construct diverse classes of σ(z) in order to explore this space. To avoid pitfalls during interpretation, it is essential to investigate the extent of the nonuniqueness permitted by the MT data. Algorithm 1 is a two-stage process based on

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16

Sule, Peter Ojo. "A broadband magnetotelluric investigation in southeast Scotland." Thesis, University of Edinburgh, 1985. http://hdl.handle.net/1842/14514.

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17

Volti, Theodora. "A magnetotelluric survey in Methana Peninsula (Greece)." Thesis, University of Edinburgh, 1996. http://hdl.handle.net/1842/14614.

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As a first deep geophysical survey, thirteen magnetotelluric (MT) and magnetovariation (MV) soundings in the period range of 0.0085 - 6000 s have been carried out in the Methana Peninsula and Trizina area (Greece) which form a part of the active Hellenic Volcanic Arc (HVA). The intensity of artificial disturbances in Methana prevented the acquisition of good quality data, and led to the exclusion of data in the 10-100 s range from further interpretation. The measured data are first processed using robust methods, then decomposed using the methods of Groom and Bailey and of Bahr. Thin sheet mod

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18

Selway, Katherine Mary. "Two-dimensional magnetotelluric responses of three-dimensional bodies /." Title page, table of contents and abstract only, 2002. http://web4.library.adelaide.edu.au/theses/09SB/09sbs469.pdf.

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19

Lu, Xinyou. "Inversion of controlled-source audio-frequency magnetotelluric data /." Thesis, Connect to this title online; UW restricted, 1999. http://hdl.handle.net/1773/6799.

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20

Alvarez, Aramberri Julen. "hp-Adaptive Simulation and Inversion of Magnetotelluric Measurements." Thesis, Pau, 2015. http://www.theses.fr/2015PAUU3056/document.

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La magnéto-tellurique (MT) (Cagniard 1953, Tikhonov 1950) est une technique d'exploration de la Terre basée sur des mesures de champs électromagnétiques (EM). Une source naturelle (non artificielle) harmonique en temps et située dans l'ionosphère (Weaver 1994) produit un champ EM régi par les équations de Maxwell. Les champs électromagnétiques sont enregistrés par plusieurs récepteurs placés sur la surface de la Terre. Ces mesures sont utilisées pour produire une image du sous-sol à partir d'un procédé d'inversion utilisant des méthodes numériques. Nous utilisons la méthode hp-FEM résultant d'

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21

Zhang, Ai Jun. "Modelling and inversion of two-dimensional magnetotelluric data." Thesis, University of Edinburgh, 1988. http://hdl.handle.net/1842/14717.

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22

Tzanis, Andreas. "Investigations on the properties and estimation of earth response operators from EM sounding data." Thesis, University of Edinburgh, 1987. http://hdl.handle.net/1842/11480.

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23

Galanopoulos, Dimitrios. "Magnetotelluric studies in geothermal areas of Greece and Kenya." Thesis, University of Edinburgh, 1989. http://hdl.handle.net/1842/10909.

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24

Travassos, Jandyr de Menezes. "Investigations of the analysis and modelling of magnetotelluric data." Thesis, University of Edinburgh, 1987. http://hdl.handle.net/1842/11935.

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25

Rydman, Oskar. "Data processing of Controlled Source Audio Magnetotelluric (CSAMT) Data." Thesis, Uppsala universitet, Geofysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-387246.

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During this project three distinct methods to improve the data processing of Controlled Source Audio Magnetotellurics (CSAMT) data are implemented and their advantages and disadvantages are discussed. The methods in question are: Detrending the time series in the time domain, instead of detrending in the frequencydomain. Implementation of a coherency test to pinpoint data segments of low quality andremove these data from the calculations. Implementing a method to detect and remove transients from the time series toreduce background noise in the frequency spectra. Both the detrending in time do

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26

Pandey, Dhananjai Kumar. "Analysis of seismic and magnetotelluric data from Kutch, India." Thesis, University of Cambridge, 2004. https://www.repository.cam.ac.uk/handle/1810/251907.

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27

Shan, Chunling. "Natural and Controlled Source Magnetotelluric Data Processing and Modeling." Doctoral thesis, Uppsala universitet, Geofysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-229917.

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In this thesis, four studies using different geophysical electromagnetic methods are presented. In the first study dealing with airborne measurements, the noise response due to the rotation of the aircraft and the aircraft itself as a metallic conductive body on the Earth's electromagnetic response in very low frequency and low frequency band was investigated. The magnetic fields are independent of the aircraft in the VLF band and part of the LF band. But at higher frequencies (above 100 kHz), the signals are more influenced by the aircraft. The aircraft also generates its own noise frequencie

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28

Johnson, Nicholas Edward. "Magnetotelluric studies of the crust and upper mantle in a zone of active continental breakup, Afar, Ethiopia." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/7739.

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The Afar region of Ethiopia is slowly being torn apart by the Red Sea, Gulf of Aden and Main Ethiopian rifts which all meet at this remote, barren corner of Africa. Prior to rifting, volcanism probably started here some 30 million years ago, marked by the arrival of the Afar mantle plume and subsequent eruption of kilometres thick flood basalts. To the north and east the Red Sea and Gulf of Aden rifts have already progressed to become sea-floor spreading centres where new oceanic crust is produced. Active spreading on the Red Sea rift takes a landward step west into Eritrean Afar at approximat

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29

Gill, Robert Michael. "A magnetotelluric profile across the Broken Hill and Olary Domains /." Title page, table of contents and abstract only, 2002. http://web4.library.adelaide.edu.au/theses/09SB/09sbg4756.pdf.

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30

Bailey, David. "Magnetotelluric studies of the Zambezi Valley mobile belt, Northern Zimbabwe." Thesis, University of Edinburgh, 1998. http://hdl.handle.net/1842/10697.

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The Mana Pools and Lower Zambezi Karoo sedimentary basins lie within the Zambezi mobile belt in northern Zimbabwe. The subsurface apparent resistivities measured at both locations are extremely low. This thesis models the resistivity structure of these two basins and the underlying material. New and pre-existing magnetotelluric data and the available seismic reflection data are used to determine the basin structure and the depth of the electrical basement. Long period magnetotelluric data were collected at 5 stations along a 60 km profile running north-south across the Mana Pools basin and ont

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31

Krause, P. J. "Geomagnetic and magnetotelluric studies in the South-West of England." Thesis, University of Exeter, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.353997.

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32

Fleming, John B., Husna D. Hafit, Khaliza B. Khalid, et al. "Controlled Source Audio Magnetotelluric (CSAMT) Surveys in the Tucson Mountains." LASI Laboratory for Advanced Surface Imaging, The University of Arizona (Tucson, AZ), 2012. http://hdl.handle.net/10150/624629.

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Controlled Source Audio-Magnetotellurics (CSAMT) surveys were conducted in 2012 in the Tucson Mountains as a continuation of the 2010 and 2011 Laboratory for Advanced Subsurface Imaging (LASI) field studies in this area. This geologic setting was chosen for its high-resistivity impermeable volcanic layer overlaying porous sedimentary layers. This type of structure has potential for water resources and as a reservoir for compressed air energy storage (CAES). The data from 2,500 meters of CSAMT survey lines generated 900 meter-deep resistivity versus elevation cross-sections and six plan maps of

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33

Ulugergerli, Emin Ugur. "Development and application of 2D magnetotelluric inversion in complex domain." Thesis, University of Leicester, 1998. http://hdl.handle.net/2381/30430.

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The magnetotelluric method is widely used in the investigation of the geo-electric structure of the earth. The field data are traditionally inverted to reveal the subsurface structure solved using regularised iterative inversion techniques. These interpretation schemes effect matrix computations in real domain due to operational simplicity. The speed of convergence of these techniques is controlled by the calculation type and the size of the program or more specifically, size of the matrices used. A common problem encountered when dealing with real matrices in 2D regularised inversion is their

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34

Adetunji, Ademola Quadri. "Resistivity structure of the Precambrian Grenville Province, Canada." Tectonophysics, 2014. http://hdl.handle.net/1993/23450.

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As part of the southern Ontario POLARIS project, this thesis uses magnetotelluric methods to investigate the lithospheric architecture of the Proterozoic Grenville Province and its margin with the Archean Superior Province. The first multi-dimensional crustal and lithospheric resistivity images for this region are presented. The resistivity structure of the Phanerozoic sedimentary rocks in the lower Great Lakes region was determined using 1-D methods. The responses are strongly affected by a 20-23 S conductive layer within the sedimentary rocks, interpreted to be associated with Upper Ordovi

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35

Niasari, Sintia W. [Verfasser]. "Magnetotelluric Investigation of the Sipoholon Geothermal Field, Indonesia / Sintia W. Niasari." Berlin : Freie Universität Berlin, 2015. http://d-nb.info/1065670249/34.

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36

Chen, Jin [Verfasser]. "Using Empirical Mode Decomposition to Process Marine Magnetotelluric Data / Jin Chen." Kiel : Universitätsbibliothek Kiel, 2014. http://d-nb.info/1049189329/34.

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37

Ogaya, Garcia Xènia. "Magnetotelluric characterisation and monitoring of the Hontomín CO2 storage site, Spain." Doctoral thesis, Universitat de Barcelona, 2014. http://hdl.handle.net/10803/284957.

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The electromagnetic methods are especially interesting for the characterisation and monitoring of geological storage of CO2 sites. The electrical resistivity is a physical parameter that depends on the mineralogical composition of the rocks, as well as on other characteristics such as porosity, pore connectivity, pore fluid salinity, saturation, temperature and pressure. The CO2 injected in the reservoir produce changes in the resistivity that enables its detection with electromagnetic methods. However, it is necessary to have a thorough knowledge of the structure at the pre-injection sta

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38

Li, Shenghui. "The indepth magnetotelluric experiment on the Tibetan Plateau and its implications /." Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/6817.

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39

Valtersson, Einar. "Comparison of data analysis methods KMSProTF and MsDEMPCA using Magnetotelluric data." Thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-80195.

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In this work two ways of processing controlled-source magnetotelluric (MT) data were tried and compared against each other. The aim was to evaluate the diﬀerences between a multivariate-based processing method to a bivariate processing method. The software KMSProTF represents conventional processing using bivariate and robust statistics. MsDEMPCA utilizes a multi-variate Criss-Cross regression scheme to improve the condition of the data-matrix before robustly decomposing it into principal components. Data from the FENICS-19 survey in northern Scandinavia was processed to transfer functions (TF

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40

Parr, Ronald S. "Development of magnetotelluric processing and modelling procedures : application to Northern England." Thesis, University of Edinburgh, 1991. http://hdl.handle.net/1842/12772.

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The magnetotelluric (MT) method is a geophysical technique which uses observations of the naturally occurring electromagnetic (EM) field variations to determine the electrical impedance as a function of frequency. Owing to the variable signal and often high level of noise contamination, it is usual to collect large numbers of observations and perform parameter regression in order to gain reliable estimates of this Earth response function. It is then transformed into more interpretable, albeit non-unique, resistivity versus depth models. In the course of this study, the processing, modelling an

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41

Hill, Edmund Roger Gerard. "A magnetotelluric study in the Moine Thrust region of northern Scotland." Thesis, University of Edinburgh, 1987. http://hdl.handle.net/1842/14067.

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42

Zhang, Yuanhua. "Wavelet transforms, neural networks and migration applied to magnetotellurics." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq23897.pdf.

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43

Dosso, Stanley Edward. "Inversion and appraisal for the one-dimensional magnetotellurics problem." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/30692.

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The method of magnetotellurics (MT) uses surface measurements of naturally-occurring electromagnetic fields to investigate the conductivity distribution within the Earth. In many interpretations it is adequate to represent the conductivity structure by a one-dimensional (1-D) model. Inferring information about this model from surface field measurements is a non-linear inverse problem. In this thesis, linearized construction and appraisal algorithms are developed for the 1-D MT inverse problem. To formulate a linearized approach, the forward operator is expanded in a generalized Taylor series

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44

Yan, Ping. "Inversion of Magnetotelluric Data Constrained by Borehole Logs and Reflection Seismic Sections." Doctoral thesis, Uppsala universitet, Geofysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-303498.

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This thesis presents two new algorithms for doing constrained Magnetotelluric (MT) inversion based on an existing Occam 2D inversion program. The first algorithm includes borehole resistivity logs as prior information to constrain resistivity directly in the vicinity of boreholes. The second algorithm uses reflection seismic data as prior constraints to transfer structural information from seismic images to 2D resistivity models. These two algorithms are efficient (proved through tests of synthetic examples) and widely applicable. In this thesis, they have been successfully applied to the COSC

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45

Aradiy, Edy Muhammad. "RESISTIVITY STRUCTURE BENEATH SAKURAJIMA AND MERAPI VOLCANOES INFERRED FROM MAGNETOTELLURIC(MT) SURVEY." 京都大学 (Kyoto University), 1995. http://hdl.handle.net/2433/160890.

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本文データは平成22年度国立国会図書館の学位論文(博士)のデジタル化実施により作成された画像ファイルを基にpdf変換したものである<br>Kyoto University (京都大学)<br>0048<br>新制・論文博士<br>博士(理学)<br>乙第8756号<br>論理博第1260号<br>新制||理||888(附属図書館)<br>UT51-95-B221<br>(主査)教授西村進, 教授小林芳正, 教授坂野昇平<br>学位規則第4条第2項該当

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46

Sakkas, Vassilis A. "Combined transient electromagnetic and magnetotelluric study of the southern Kenya Rift Valley." Thesis, University of Leicester, 1999. http://hdl.handle.net/2381/30437.

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The transient electromagnetic (TEM) method and the magnetotelluric (MT) technique have been applied to determine the electrical resistivity structure across the southern Kenya Rift Valley. The main profile extends from the shores of Lake Victoria, west of the Rift Valley, to the north of the Chyulu Hills volcanic chain, 150 km SE of the rift. A second profile runs parallel to the Chyulu Hills volcanic trend. Data from 19 stations along the two profiles have been processed using classical techniques and in the case of MT, analysed with modern tensor decomposition methods. The TEM data have faci

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47

Mohamed, Adel K. "Applications of magnetotelluric and transient electromagnetic methods in groundwater and engineering studies." Thesis, University of Leicester, 2002. http://hdl.handle.net/2381/30449.

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The main aim of this study is to use the transient electromagnetic (TEM) and magnetotelluric (MT) methods to determine the electrical resistivity distribution of the subsurface and locate possible structural features controlling groundwater distribution in the northern and south-eastern margins of Parnaiba basin, Brazil. MT data from 24 stations along two profiles across the margins of the basin have been processed using standard tensorial techniques to obtain the interpretable response functions. The TEM data recorded at the same sites facilitated the removal of static shift and the recovery

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48

Hjärtén, Martin. "Master thesis in interpretation of controlled-source radiomagnetotelluric data from Hallandsåsen." Thesis, Uppsala University, Geophysics, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8015.

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<p>Controlled Source Tensor Magnetotelluric (CSTMT) ground measurements were executed on the Hallandsåsen horst where a major tunnel is under construction. The instrument system EnviroMT are used for this purpose. The major research aspect of this thesis has been to form an opinion of the effectiveness of the method by comparing the results from the CSTMT survey with a prior investigation performed with the DC resistivity method. Another important part of this thesis has been to compile the basic and fundamental CSTMT and RMT theory, in a way that people outside the EM community easily can be

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49

Ismail, Nazli. "Controlled Source Radiomagnetotelluric (CSRMT) Applications in Environmental and Resource Exploration." Doctoral thesis, Uppsala universitet, Geofysik, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-102750.

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An integrated use of radio magnetotelluric (RMT) and controlled source tensor magnetotelluric (CSTMT) measurements, the so-called CSRMT method, has been employed in environmental and resource exploration studies. A number of case histories, including a groundwater investigation in glacial deposits, a study of fracture zones for geotechnical purposes and a mining exploration study of a copper deposit, are presented in this thesis in order to illustrate the usefulness and capability of the CSRMT method. The resolutions of the estimated models using various types of data are studied. Magnetotellu

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50

Chen, Xiaoming [Verfasser], and Ute [Akademischer Betreuer] Weckmann. "Two-dimensional constrained anisotropic inversion of magnetotelluric data / Xiaoming Chen. Betreuer: Ute Weckmann." Potsdam : Universitätsbibliothek der Universität Potsdam, 2012. http://d-nb.info/1029243824/34.

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