Spatial analysis of the geomagnetic field gradient at repeater stations in Eastern Uzbekistan and its geological interpretation

The article presents a phase analysis of the gradient values obtained at 131 repeated (remeasured) geomagnetic stations located in the territory of Eastern Uzbekistan (eastern part of Tashkent region, Fergana Valley, Namangan and Andijan regions). The difference (ΔΤ) between the value of the Earth's normal magnetic field and the measured gradient value at each point was calculated. As a result of statistical analysis, it was determined that the ΔΤ values vary from -27.94 to +24.86 nT1, with an average value of +1.52 nT1 and a standard deviation of ±8.43 nT1. The spatial distribution is uneven, and positive and negative anomalies form certain groups, which are mainly concentrated around the Talas-Fergana fault, the Karjantau-Tavaksay tectonic intersection and the Charvak geodynamic polygon. The results obtained indicate that the spatial variability of the geomagnetic gradient is related to the geologikal and tectonic structure of the area, including deep faults, block structures, and the magnetic properties of rocks. The results of the study have practical significance in improving geomagnetic monitoring and seismoprognostic work.

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