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TitleGeomagnetic surveys at West Hawk Lake, Manitoba, Canada
AuthorClark, J F
SourceEarth Physics Branch, Geomagnetic Series no. 20, 1980, 11 pages, (Open Access)
PublisherEnergy, Mines and Resources Canada
Mediapaper; on-line; digital
File formatpdf
AreaWest Hawk Lake
Subjectsgeophysics; magnetic interpretations; meteorite craters; magnetic surveys, ground; magnetic surveys, airborne; geomagnetism; West Hawk Lake Astrobleme
Illustrationsgeoscientific sketch maps; models; plots; tables
Released1980 01 01; 2018 11 13
AbstractWest Hawk Lake - Lat. 49 . 7°N, Long. 95 . 2oW - is a near-circular structure of impact origin . A contour map of magnetic total intensity (F) has been compiled from observations at 225 stations on the land surrounding the lake and about 300 stations over the lake in summer and winter. The contours have a circular form centered on the lake with a main low in F over the southern part of the lake and a secondary low over a northern sector. A comparison of F values obtained from an aeromagnetic survey of the area and the surface data indicates contour patterns and gradients consistent with an asymmetrical meteoritic crater whose diameter is 2.5 + 0.2 km. Values of near-surface apparent resistivity measured close to the rim and shoreline are low (~ 100 ohm-m) but increase rapidly to about 8,500 ohm-m a few km outside the rim.