Assessment of the geophysical characteristics of the upper turk landslide using hvsr and masw methods

This study assesses the geophysical characteristics of the Upper Turk landslide in the Ohangaron District using Horizontal-to-Vertical Spectral Ratio (HVSR) and Multichannel Analysis of Surface Waves (MASW) methods. HVSR measurements were used to determine the fundamental resonance frequency (fo) and H/V amplitude, while three 48-channel MASW profiles were used to construct shear-wave velocity (Vs) models and calculate Vs30. The Vs30 values were 273.1, 306.5, and 287.8 m/s, with the highest value in Profile 2. A marked increase in Vs was identified at approximately 22–32 m depth. HVSR results showed fo values of 1.57–2.54 Hz. Joint interpretation of HVSR and MASW data revealed spatial and depth-dependent heterogeneity within the landslide massif and identified relatively weakened and competent zones.

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