Total magnetic intensity map of the Charity Shoal structure, northeastern Lake Ontario

Description

Magnetic survey data over the Charity Shoal Structure in northern lake Ontario Canada. Data shows large anomaly over suspected impact structure. Grid provided is the grid used to create the models of Charity Shoal

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Magnetic surveys were acquired using a marine Overhauser magnetometer (Marine Magnetics SeaspyTM) towed 60 m behind the survey vessel. A total of ~180 line-km of total magnetic intensity (TMI) data were collected over a 9-km2 area with a nominal line separation of 50 m (N-S) and tie lines at 100 m (W-E) (Fig. 1B inset) The sensor was cycled at 2 Hz, providing ~2 samples per metre at a survey speed of 5 kmh-1. The diurnal magnetic variation was recorded using a submersible base station magnetometer (Marine Magnetics SentinelTM) deployed in ~2 m water depth on the structure rim. Magnetic survey data processing included corrections for diurnal variation, sensor layback and tie-line leveling using an iterative least squares algorithm. The levelled TMI data were gridded using minimum curvature interpolation at 25 m cell size. Magnetic survey data processing included corrections for diurnal variation, sensor layback and tie-line leveling using an iterative least squares algorithm. The levelled TMI data were gridded using minimum curvature interpolation at 25 m cell size. The grid provided is the final TMI grid used in modelling.

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