6L (2018-2018): PACIFIC ambient noise dense seismic survey at Marathon deposits

• Grenoble Alpes University (UGA), France

Between September 17th and October 26th of 2018, at the Marathon test site(Ontario, Canada), a 1025 sensor passive seismic survey was completed. The aim of the acquisition was to extract body waves from ambient noise to image the subsurface. Indeed, Once body waves have been extracted, the data can be processed to acquire reflection seismic sections, following industry standard methods as commonly applied in the hydrocarbons sector.

The sensors equipment was rented from SAExploration. 1025 sensors were successfully deployed; however, only 1013 were recovered. The loss of sensors was due to animal activity or being buried by a rock slide.
The grid design was composed of two overlapping grids, a 416-sensor array and a 609-sensor profile line. The array had a grid spacing of 150 m, while the profile line had a grid spacing of 50 m. Both grids designs were configured along the main noise source of Lake Superior in the direction of 250deg to the west.
The sensors selected for the survey were ZLAND Fairfield vertical direction sensors with a 9 Hz range. Once the sensors were retrieved, they were shipped back to SAExploration for download. The data was successfully downloaded and shipped to Sisprobe for conversion to MSEED format.

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