On the study of anomalous variations of the geomagnetic field
S.KH. Maksudov
Laboratory“Fundamental problems of earthquake forecasting”of the Institute of Seismology of the Academy of Sciences of the Republic of Uzbekistan, Tashkent, 100128,Uzbekistan
Keywords: geomagnetic field; magnetic anomalies; abnormal fluctuations; paleomagnetic data; archaeomagnetic data
Abstract
Elucidation of the nature of anomalous variations of the geomagnetic field throughout the geological and modern periods is important for identifying local anomalies associated with the preparation of strong earthquakes. The results of detailed studies of geomagnetic field variations over the past 100 years reflect the manifestation of anomalies in a wide spatiotemporal spectrum, intensity and shape. In terms of their parameters, they are comparable to the anomalous variations caused by the processes of preparation of strong (M ≥ 5) earthquakes. As a result of a review of the literature, it was found that the period of secular variations of the geomagnetic field according to paleomagnetic data ranges from 600 to 100 thousand years. According to the archaeomagnetic data, abnormal fluctuations of the geomagnetic field with a period of several decades to 8-9 thousand years have been revealed. Measurements of the geomagnetic field over the past 200 years have revealed abnormal fluctuations with periods from 10-15 days to 20-60 years. The main versions about the possible nature of the age-old variations manifested in the geological past and present are given.
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