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- Kalscheuer, Thomas,1975-Uppsala universitet,Geofysik (författare)
Improvement and Assessment of Two-Dimensional Resistivity Models Derived from Radiomagnetotelluric and Direct-Current Resistivity Data
- BokEngelska2008
Förlag, utgivningsår, omfång ...
- Uppsala :Acta Universitatis Upsaliensis,2008
- 82 s.
- electronicrdacarrier
Nummerbeteckningar
- LIBRIS-ID:oai:DiVA.org:uu-9366
- ISBN:9789155473341
- https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-9366URI
Kompletterande språkuppgifter
- Språk:engelska
- Sammanfattning på:engelska
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Klassifikation
Serie
- Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology,1651-6214 ;572
Anmärkningar
- Two-dimensional (2-D) models of electrical resistivity are improved by jointly inverting radiomagnetotelluric (RMT) and direct-current resistivity (DCR) data or by allowing for displacement currents in the inversion of RMT data collected on highly resistive bedrock. Uniqueness and stability of the 2-D models are assessed with a model variance and resolution analysis that allows for the non-linearity of the inverse problem.Model variance and resolution are estimated with a truncated singular value decomposition (TSVD) of the sensitivity matrix. In the computation of model errors, inverse singular values are replaced by non-linear semi-axes and the number of included eigenvectors is increased until a given error threshold is reached. Non-linear error estimates are verified with most-squares inversions. For the obtained truncation levels, model resolution matrices are computed. For RMT data, non-linear error appraisals are smaller than linearized ones. Hence, the consideration of the non-linearity in RMT data leads to reduced model errors or enhanced model resolution.The dielectric effect on RMT data is investigated with a new 2-D forward and inverse code that allows for displacement currents. As compared to the quasi-static approximation, apparent resistivities and phases of the impedance tensor elements are found to be significantly smaller and the vertical magnetic transfer function exhibits more distinct sign reversals. More reliable models of electrical resistivity are obtained from areas with highly resistive bedrock, if displacement currents are allowed for. In contrast, inversions with a quasi-static scheme introduce artefactual structures with extremely low or high resistivities.A smoothness-constrained 2-D joint inversion of RMT and DCR data is presented. The non-linear model variance and resolution analysis is applied to single and joint inverse models. For DCR data, the errors estimated by most-squares inversions are consistently larger than those estimated by the non-linear semi-axes, indicating that DCR models are poorly resolved. Certain areas of the joint inverse models are better resolved than in the single inverse models.
Ämnesord och genrebeteckningar
- NATURVETENSKAP Geovetenskap och miljövetenskap Geofysik hsv//swe
- NATURAL SCIENCES Earth and Related Environmental Sciences Geophysics hsv//eng
- Electromagnetic geophysics
- radiomagnetotellurics
- direct-current resistivity
- displacement currents
- dielectric effect
- non-linearity
- inversion
- regularization
- two-dimensional model
- model variance
- model resolution
- data resolution
- Geophysics
- Geofysik
Biuppslag (personer, institutioner, konferenser, titlar ...)
- Pedersen, Laust B.,Prof. Dr.Uppsala universitet,Institutionen för geovetenskaper (preses)
- Juhlin, Christopher,Prof. Dr.Uppsala universitet,Institutionen för geovetenskaper (preses)
- Roberts, Roland,Prof. Dr.Uppsala universitet,Institutionen för geovetenskaper (preses)
- Brasse, Heinrich,Dr.Freie Universität Berlin (opponent)
- Uppsala universitetGeofysik (creator_code:org_t)
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