V.V. Gordienko, ABOUT THE SOURCE OF THE KURSK MAGNETIC ANOMALY

https://doi.org/10.15407/gpimo2024.02.091

V.V. Gordienko, Dr. Sci. (Geol.&Mineral.), Prof., Chief Researcher
E-mail: gordienkovadim39@gmail.com ORCID 0000-0001-9430-7801
Scopus author Id = 7102473958

V.M. Tarasov, PhD (Geol.), Leading Researcher
E-mail: tarigvt@gmail.com ORCID 0000-0001-9906-9259
Scopus authorId = 7202005503

S.I. Subbotin Institute of Geophysics of NAS of Ukraine
32, Palladin ave., Kyiv, Ukraine, 03142

ABOUT THE SOURCE OF THE KURSK MAGNETIC ANOMALY

The article contains the results of the study of the Kursk magnetic anomaly, which has attracted the attention of many geophysicists for decades, including in the form of field disturbances recorded by the equipment of artificial Earth satellites. This particular variant of the KMA is considered in the paper. Many publications have been devoted to the first satellite data. However, after the appearance of more substantiated and detailed information supplied by the next generation of satellites, the first results were pushed back to the background. According to the author, this is not entirely correct. The horizontal displacement of the anomaly is beyond doubt. However other parameters can be used for interpretation with those available in the latest data. Thus, it is possible to study 4 satellite anomalies observed at altitudes of 325, 350, 400 and 480 km. The analysis was carried out for the relative values of the magnetic field within the anomaly. The point is that the use for interpretation, which assumes absolute values, requires introducing the magnetization value of the source substance. The available examples of this approach and the author’s experience in studying geophysical data for the region do not convince us that a reliable determination of this parameter is achievable. At a purely qualitative level, the source shape used (a vertical cylinder of limited depth) and the area of its horizontal section (a circle of radius 200 km) was established. It was also established (based on gravimetric, geothermal, and seismic data) that its entire territory is located in the zone of recent activation. Calculation of deep temperatures for this case indicates that at a depth of about 25 km the Curie temperature of magnetite is exceeded. That is, the source's sole is located here. For such parameters, the distribution of relative magnetic field values at altitudes was calculated and compared with the observed ones. The consistency is quite acceptable given the available error of the experimental data. But this error is significant enough, it is almost impossible to clarify the accepted source parameters.

Keywords: Kursk magnetic anomaly, satellite data, anomaly source parameters.

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