Sensitivity of magnetotelluric soundings to typical electrical conductivity anomalies in the tectonosphere
https://doi.org/10.55959/MSU0579-9406-4-2023-63-6-134-143
Abstract
A three-dimensional resistivity model is presented that contains electrical resistivity anomalies of a complex shape on three structural levels: in the sedimentary cover, in the consolidated earth’s crust and in the upper mantle. The synthetic (model) magnetotelluric data obtained as a result of solving the forward problem are analyzed to identify anomalies associated with resistivity inhomogeneities at various depths. Quantitative estimates of the sensitivity of various components of magnetotelluric data to these inhomogeneities are given. Further, we plan to use the presented data to evaluate the effectiveness of various methods for solving inverse problems.
About the Authors
D. D. PopovRussian Federation
Danila D. Popov
Moscow
P. Yu. Pushkarev
Russian Federation
Pavel Yu. Pushkarev
Moscow
References
1. Бердичевский М.Н. Основы теории магнитотеллурического профилирования // Прикладная геофизика. 1960. Вып. 28. С. 70–91.
2. Варенцов И.М., Соколова Е.Ю., Мартанус Е.Р., Наливайко К.В. Система передаточных операторов электромагнитного поля для массива синхронных зондирований BEAR // Физика Земли. 2003. № 2. С. 30–61.
3. Ковтун А.А., Успенский Н.И. Геоэлектрика. Естественное поле. СПб., 2008. 122 с.
4. Cantwell T. Detection and analysis of low frequency magnetotelluric signals. Ph.D. Thesis. Cambridge, 1960.
5. Hobbs B.A. Terminology and symbols for use in studies of electromagnetic induction in the Earth // Surveys in Geophysics. 1992. Vol. 13. P. 489–515.
6. Mackie R.L., Madden T.R., Wannamaker P.E. Three-dimensional magnetotelluric modeling using difference equations — theory and comparison to integral equation solutions // Geophysics. 1993. Vol. 58. P. 215–226.
7. Parkinson W.D. Direction of rapid geomagnetic fluctuation // Geophysical Journal of the Royal Astronomical Society. 1959. Vol. 2. P. 1–14.
8. Wiese H. Geomagnetische tiefentellurik, Teil 2, Die streichrichtung der untergrundstrukturen des elektrischen winderstandes, erschlossen aus geomagnetischen variationen // Geofisica Pura e Applicata. 1962. Vol. 52. P. 83–103.
Review
For citations:
Popov D.D., Pushkarev P.Yu. Sensitivity of magnetotelluric soundings to typical electrical conductivity anomalies in the tectonosphere. Moscow University Bulletin. Series 4. Geology. 2023;(6):134-143. (In Russ.) https://doi.org/10.55959/MSU0579-9406-4-2023-63-6-134-143












