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Authors: Spichak, V.*
Title: Three-dimensional interpretation of MT data in volcanic environments (computer simulation)
Issue Date: Apr-2001
Series/Report no.: 44/2
Keywords: 3D interpretation
magnetotelluric data
monitorinc volcanoes
magma chamber
remote sounding
Abstract: The 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:04.08.07. Instruments and techniques
04.08.06. Volcano monitoring
Annals of Geophysics

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