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Publisher-reported update

2026-08-26

Regional mapping of soil stiffness improves understanding of seismic hazard in northern Canada, specifically southwestern Yukon, where local amplification hazards are largely unknown. Ambient vibration (AV) measurements record microtremor seismic noise used to calculate the horizontalto-vertical spectral ratio (HVSR) and identify resonant frequencies at sites. In-situ estimation of fundamental frequency (f0) is used to characterize sites and map local site amplification hazards. Furthermore, AV measurements permit the estimation of surface-wave propagation speeds at different frequencies (i.e., dispersion). Dispersion measurements are used to infer profiles of shear-wave velocity as a function of depth. We present preliminary site characterization using AV measurements from 23 measured sites in Haines Junction, Yukon. The preliminary results suggest a spatial trend of fundamental frequency laterally, where higher frequencies are identified north of Haines Junction and lower f0 values are identified in south-central Haines Junction. We attribute these observations to the proximity to the Dezadeash River basin.

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