Seismic Velocity Variations Illustrate Hydrological and Ecohydrological Processes in a Mountain Watershed
Feng, Kuan-Fu ， Lin, Fan-Chi ， Warix, Sara ， Brooks, Paul D. ， Zeng, Qicheng ， van Dam, Tonie
2026-06-16 GEOPHYSICAL RESEARCH LETTERS 2026 53(卷), 12(期), (null页)
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We employ passive seismic interferometry to study seismic hydrological responses in a snowmelt-driven, semi-arid catchment. Seismic velocity changes (dv/v) at 2-4 Hz and 4-8 Hz are analyzed from six stations along a hillslope transect between May and November 2023 and compared to precipitation, soil moisture, and groundwater level timeseries. Variation in dv/v correlates with groundwater level and mirrors seasonal catchment wetting and evapotranspiration. Correlations between dv/v and groundwater are stronger at stations on the cooler, wetter, north-facing hillslope than on the warmer, drier, south-facing hillslope, consistent with expected recharge and evapotranspiration patterns. Different dv/v behaviors across two bands suggest depth-dependent pore-pressure changes, outlining different hydrologic zones. These findings highlight the utility of dv/v measurements in detecting laterally supplied water inputs, providing insight into local vertical water losses, effectively tracking groundwater-vegetation interactions, and supporting ecohydrological research and water management in semi-arid snowmelt systems.
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