Abstract

This study examines the background seismic noise in the southern Western Canadian Sedimentary Basin (WCSB) using broadband seismic records from Canadian Rockies and Alberta Network (CRANE) and Canadian National Seismograph Network (CNSN). The cross‐correlations of vertical‐component data reveal highly asymmetric Rayleigh wave signals in the frequency range of 0.02–0.2 Hz. Travel‐time and waveform source migration calculations jointly suggest a persistent noise source near Lesser Slave Lake (LSL), a large ice‐covered lake in Alberta, Canada, during winter months. The source origin remains unclear, though the gravity current and turbulence induced by laterally varying luminosity, ice thickness, lake depth, and lake‐bottom topography could contribute to the observed microseismic signal. Seasonal variations in regional wind energy, ground attenuation, and local industrial and/or recreational activities may also affect the clarity and asymmetry of noise‐correlation functions.

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