Microseismic background conditions and their relationship with the geomagnetic field at the yangibozor observatory during 2021–2025

The Yangibozor Experimental Research Observatory is an important geophysical observation site in Uzbekistan, where seismic, microseismic, and geomagnetic observations are conducted. The study of microseismic background variations is important for understanding the dynamic characteristics of the ground and identifying changes associated with natural and anthropogenic factors .Microseismic vibrations are continuous low-amplitude ground motions generated by natural processes and human activity. Their spectral characteristics can provide information about the dynamic properties of the subsurface. The Horizontal-to-Vertical Spectral Ratio (HVSR) method is widely used for this purpose and allows the fundamental resonance frequency (F o ) and maximum spectral amplitude (A o ) to be determined. Previous studies in Uzbekistan have investigated seismic hazard, soil characteristics, seismic microzonation, and geomagnetic variations in seismically active regions. However, long-term analysis of the microseismic background at the Yangibozor Observatory and its relationship with geomagnetic variations remains important.The aim of this study is to analyze microseismic data recorded at the Yangibozor Observatory during 2021–2025 using the Geopsy software and HVSR method, determine the temporal variations of F o and A o , and assess their relationship with changes in the geomagnetic field.

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