Index Geophysics

Three-dimensional interpretation of MT data in volcanic environments (computer simulation)

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.

V. Spichak

3D interpretation

magnetotelluric data

imaging

monitorinc volcanoes

magma chamber

remote sounding

Meteorology. Climatology

QC851-999

Geophysics. Cosmic physics

QC801-809

Istituto Nazionale di Geofisica e Vulcanologia (INGV)

2001-06-01T00:00:00Z

article

10.4401/ag-3593

1593-5213

2037-416X

https://doaj.org/article/be4017b2c6474c8898b971c5f17886ff

Annals of Geophysics, Vol 44, Iss 2 (2001)

EN

http://www.annalsofgeophysics.eu/index.php/annals/article/view/3593

https://doaj.org/toc/1593-5213

https://doaj.org/toc/2037-416X

Journal Licence: CC BY