Integrated geophysical–geodetic monitoring of the Karjantau–Tavaksay fault junction, Tashkent region

This study presents the results of integrated geological, geophysical, and geodetic investigations conducted in the Tashkent region, with a particular focus on the intersection of the Karjantau and Tavaksay fault zones. Magnetometric surveys carried out in 2016 and 2025 revealed localized anomalies in the geomagnetic field, which may be linked to slow geodynamic processes within the Earth's crust. High-precision tachometric data from 2016 were compared with historical levelling data from 1979–1980 to assess vertical crustal movements over a 36-year period. The most significant displacements were recorded near the Ferma and Visota observation points, located close to active fault zones. Magnetometric measurements revealed stable yet locally varying geomagnetic field intensities, with the most pronounced anomalies observed near the junction of the Kumbel-Kokand-Karjantau and Tavaksay-Karjantau faults. The magnetic field intensity maps showed that anomalies persisted over time, particularly in areas like the Charvak reservoir, Karamazar, and Tavaksay regions. Correlation analysis of data from 2025, relative to a reference point (Karamazar-5), demonstrated that 18 observation points had high similarity in magnetic variations, with 9 showing correlation coefficients above 88%. Despite the absence of major seismic events during the study period, the observed anomalies suggest ongoing geodynamic activity.

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