Geoscientific studies of Champlain Sea sediments, Bilberry Creek, Ottawa, Ontario : firm ground depth estimation through microtremor Horizontal-to-Vertical Spectral Ratios (HVSR) / B. Dietiker.: M183-2/8729E-PDF

"To support selection of prospective sediment drilling sites in Orleans (Ottawa), geophysical investigations allowed a rapid estimation of depth to firm ground for several candidate locations within Champlain Sea deposits. In the Bilberry and Voyageur Creek areas, 12 ambient seismic noise measurements were recorded. Processed data from all sites fulfilled criteria for a reliable Horizontal-To-Vertical Spectral Ratio (HVSR) curve and a clear resonance peak at the fundamental resonant frequency for soft soil. Despite the low-frequency noise from windy weather and sub-optimal instrument-ground coupling, 11 sites had peak amplitudes between 6.3 and 9.8. One site had a broad peak and a low amplitude of 3.5, suspected to correlate with a dipping firm ground surface. Fundamental resonance frequencies range from 0.81 to 1.31 Hz, which translate to firm ground depths of 80 to 43 m below surface. The deepest site is located near Voyageur Creek. Within the Bilberry Creek watershed, the deepest sites are located within upstream reaches towards the southeast"--Summary, page 1.

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