Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/1208
AuthorsSpichak, V. 
TitleThree-dimensional interpretation of MT data in volcanic environments (computer simulation)
Issue DateApr-2001
Series/Report no.44/2
URIhttp://hdl.handle.net/2122/1208
Keywords3D interpretation
magnetotelluric data
imaging
monitorinc volcanoes
magma chamber
remote sounding
Subject Classification04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring 
04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques 
AbstractThe research is aimed, first, to find components of MT-fields and their transforms, which facilitate the imaging of the internal structure of volcanoes and, second, to study the detectability of conductivity variations in a magma chamber due to alterations of other physical parameters. The resolving power of MT data with respect to the electric structure of volcanic zones is studied using software developed by the author for three-dimensional (3D) numerical modeling, analysis and imaging. A set of 3D volcano models are constructed and synthetic MT data on the relief Earth's surface are analysed. It is found that impedance phases as well as in-phase and quadrature parts of the electric field type transforms enable the best imaging of the volcanic interior. The impedance determinant is, however, the most suitable for adequate interpretation of measurements carried out for the purpose of monitoring conductivity variations in a magma chamber. The way of removing the geological noise from the MT data by means of its upward analytical continuation to the artificial reference plane is discussed. Interpretation methodologies are suggested aimed at 3D imaging and monitoring volcanic interiors by MT data.
Appears in Collections:Annals of Geophysics

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