NUMERICAL ALGORITHMS FOR STRUCTURAL MAGNETOMETRY INVERSE PROBLEM SOLVING
Abstract and keywords
Abstract (English):
New methods for studying the anomalous magnetic field of the lithosphere and modeling the sources of anomalies in different layers of the Earth's crust are given in this article. The interpretation consists of three stages: separation of anomalies from the sources in different layers of the Earth's crust, data conversion to the magnetic pole and solving the inverse problem of finding the surface of sources. To isolate anomalies from different layers of the earth's crust, we used a technique based on the subsequent continuation of magnetic data up and down. Calculation of the vertical component of the anomalous magnetic field by its absolute value and conversion to the pole is based on the approximation of the anomalies of the magnetic induction modulus through a set of singular sources - magnetized rods. To solve the nonlinear inverse problem and calculate the boundaries separating layers with different magnetization, the method of local corrections was applied. The new computer technology was created using parallel computing in the multiprocessor computer systems. To demonstrate the developed methods, we chose the region of Western Urals 300 km ×230" role="presentation">×230

Keywords:
Magnetic anomaly, Earth’s crust, modelling, parallel algorithms, inverse problem
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References

1. Byzov, D., L. Muravyev, N. Fedorova (2017) , The approximation of anomalous magnetic field by array of magnetized rods, AIP Conference Proceedings, 1863, p. 560051, https://doi.org/10.1063/1.4992734

2. Chursin, A. V., A. M. Prut'yan, N. V. Fedorova (2008) , Digital anomalous magnetic field map of the Northern, Middle, Southern Urals and adjacent territories of the East-European and West-Siberian platforms, Litosfera, 6, p. 63-72 (in Russian)

3. Druzhinin, V. S., P. S. Martyshko, et al. (2015) , Tectonodynamic Model of the Earth's Crust of the Urals and Neighboring Areas, Doklady Earth Sciences, 463, no. 1, p. 659-662, https://doi.org/10.1134/S1028334X15070090

4. Fedorova, N. V. (2005) , Modeling of the magnetic field variation in relation to the origin of the Manchazh secular trend anomaly, Izvestiya. Physics of the Solid Earth, 41, no. 5, p. 355-362

5. Fedorova, N. V., A. L. Rublev (2019) , Numerical Modeling of Magnetic Anomalies Sources in the South Urals Earth Crust, Russian Geology and Geophysics, 60, no. 11, p. 1310-1318, https://doi.org/10.15372/RGG2019106

6. Fedorova, N. V., A. L. Rublev, et al. (2017) , Magnetic anomalies and model of the magnetization in the Earth's crust of circumpolar and polar the sectors of Ural region, Geofizicheskiy Zhurnal, 39, no. 1, p. 111-122, https://doi.org/10.24028/gzh.0203-3100.v39i1.2017.94014

7. IAGA, (1995) , Division V, Working Group 8, International Geomagnetic Reference Field, 1995 Revision, J. Geomag. Geoelectr., 47, no. 12, p. 1257-1261, https://doi.org/10.5636/jgg.47.1257

8. Lavrentiev, M. M. (1967) , Some Improperly Posed Problems of Mathematical Physics, 76 pp., Springer, New York, https://doi.org/10.1007/978-3-642-88210-4

9. Martyshko, P. S., I. L. Prutkin (2003) , Technology for separating the gravity sources by the depth, Geofiz. Zh., 25, no. 3, p. 159-170, https://doi.org/10.3997/2214-4609-pdb.38.F193 (in Russian)

10. Martyshko, P. S., N. V. Fedorova, et al. (2014) , Studying the Structural Features of the Lithospheric Magnetic and Gravity Fields with the Use of Parallel Algorithms, Izvestiya. Physics of the Solid Earth, 50, no. 4, p. 508-513, https://doi.org/10.1134/S1069351314040090

11. Martyshko, P. S., I. V. Ladovskii, A. G. Tsidaev (2010) , Construction of regional geophysical models based on the joint interpretation of gravitaty and seismic data, Izvestiya. Physics of the Solid Earth, 46, no. 11, p. 931-942, https://doi.org/10.1134/S1069351310110030

12. Mayer, V. I., F. I. Nikonova, N. V. Fedorova (1985) , A numerical optimization procedure for interpreting gravity and magnetic-anomalies, Izvestiya, Fizika Zemli, 5, p. 46-57

13. Olsen, N. (2002) , A model of geomagnetic field and its secular variation for epoch 2000 estimated from Orsted data, Geophysical Journal International, 149, no. 2, p. 454-462, https://doi.org/10.1046/j.1365-246X.2002.01657.x

14. Prutkin, I. L. (1986) , The solution of three-dimensional inverse gravimetric problem in the class of contact surfaces by the method of local corrections, Physics of the Solid Earth, 22, no. 1, p. 49-55

15. Puchkov, V. N. (2009) , The evolution of the Uralian orogen, Geological Society, London, Special Publications, 327, no. 1, p. 161-195, https://doi.org/10.1144/SP327.9

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