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This study investigates the one-dimensional (1D) shear wave velocity structure beneath the Himalaya-Tibet region using Rayleigh wave group velocity dispersion data from the Hi-CLIMB seismic network. Four selected regional seismic events were analyzed to obtain dispersion curves, which were subsequently averaged to derive the 1-D shear wave velocity structure across three different segments (South, Center and North) of the study region. Amplitude attenuation corrections are applied to minimize errors, particularly at longer periods. Stable Rayleigh wave group velocity dispersion curves are obtained for periods ranging from 4 to 60 s, with velocities varying from 2.46 to 3.19 km/s. The inversion results reveal shear wave velocities of 3.0–3.2 km/s in the upper crust and 2.8–3.0 km/s in the lower crust. A prominent low-velocity layer (LVL) at 30–40 km depth, consistently identified across all segments, is interpreted as fluid-rich zones within the Main Himalayan Thrust (MHT). These fluids are likely linked to active deformation processes during continental collision. These findings highlight the intricate crustal structure and seismic characteristics of the Himalaya-Tibet region, offering valuable contributions to geodynamic modelling and earthquake hazard assessments in the region.

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Seismic Characterization of Crustal Shear Wave Velocity Structure in the Himalayan and Tibet Region Using Hi-CLIMB Network: Insights from Group Velocity Dispersion Analysis

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  • 发表日期：

    2026年

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  • Utpal Saikia,
  • Ritima Das,
  • Davin Mathews David

摘要

This study investigates the one-dimensional (1D) shear wave velocity structure beneath the Himalaya-Tibet region using Rayleigh wave group velocity dispersion data from the Hi-CLIMB seismic network. Four selected regional seismic events were analyzed to obtain dispersion curves, which were subsequently averaged to derive the 1-D shear wave velocity structure across three different segments (South, Center and North) of the study region. Amplitude attenuation corrections are applied to minimize errors, particularly at longer periods. Stable Rayleigh wave group velocity dispersion curves are obtained for periods ranging from 4 to 60 s, with velocities varying from 2.46 to 3.19 km/s. The inversion results reveal shear wave velocities of 3.0–3.2 km/s in the upper crust and 2.8–3.0 km/s in the lower crust. A prominent low-velocity layer (LVL) at 30–40 km depth, consistently identified across all segments, is interpreted as fluid-rich zones within the Main Himalayan Thrust (MHT). These fluids are likely linked to active deformation processes during continental collision. These findings highlight the intricate crustal structure and seismic characteristics of the Himalaya-Tibet region, offering valuable contributions to geodynamic modelling and earthquake hazard assessments in the region.