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TitleChurchill-Kivalliq GIC study: regional resistivity model and synthetic magnetotelluric impedance responses, Manitoba and Nunavut
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorFerguson, I J; Saindon, D; Craven, J A; Boteler, D HORCID logo
SourceGeological Survey of Canada, Open File 8907, 2022, 93 pages, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediadigital; on-line
File formatreadme
File formatpdf; rtf; xlsx (Microsoft® Excel®)
ProvinceNunavut; Manitoba; Northern offshore region
NTS54C; 54D; 54E; 54F; 54K; 54L; 54M; 55; 56C; 56D; 65P; 66A
AreaKivalliq; Chesterfield Inlet; Rankin Inlet; Baker Lake; Arviat; Churchill; Nelson River; Gillam; Hudson Bay
Lat/Long WENS -98.0000 -90.0000 65.0000 56.0000
Subjectsgeophysics; regional geology; marine geology; surficial geology/geomorphology; Science and Technology; Nature and Environment; Economics and Industry; geomagnetism; geophysical surveys; geomagnetic depth soundings; magnetotelluric surveys; magnetotelluric interpretations; resistivity; conductivity; electromagnetic induction; geoelectric variations; models; modelling; energy; electric power; hydroelectric power; bedrock geology; basement geology; continental crust; mantle; software; Archean; Kivalliq Hydro-Fibre Link; North American Central Plains Conductivity Anomaly; Rae Craton; Superior Craton; Chesterfield Block; Trans Hudson Orogen; Hearne Craton; Wollaston Domain; Wathaman-Chipewyan Batholith; Great Island Terrane; Nejanilini Terrane; Hudson Bay Basin; Lithoprobe; WinGLink; Infrastructures; Natural hazards; Renewable energy; Phanerozoic; Mesozoic; Paleozoic; Precambrian; Proterozoic
Illustrationslocation maps; geoscientific sketch maps; cross-sections; stratigraphic columns; tables; profiles; models; rose diagrams; plots; geophysical logs; schematic representations
ProgramGEM-GeoNorth: Geo-mapping for Energy and Minerals GEM Program Coordination
Released2022 07 20
Summary(Plain Language Summary, not published)
This work is a literature review pertaining to electrical characteristics of the rocks in the region of the future Churchill-Kivalliq power transmission corridor from northern Manitoba to southern Nunavut. During geomagnetic disturbances, magnetic field variations induce electric currents in power transmission lines. These geomagnetically induced currents (GIC) flow to or from the ground through power transformers at substations leading to a range of problems. These include generation of harmonics that cause mis-operation of protective relays, increased reactive power demand that causes voltage sag and transformer heating. This can cause tripping out of power lines, damage to transformers, system stability problems, and, in a worst case, power blackouts. To assess the risk to a power system it is necessary to model the GIC expected in a power system during geomagnetic disturbances. This requires assessment of the earth conductivity structure to determine the geo-electric fields produced and using those geo-electric fields as input to a model of the power system to calculate the GIC that will occur. The assessment of the earth conductivity structure for the route of the Western Hudson Bay power line is described in the this report. The electrical resistivity models from a variety of surveys surrounding the corridor are used as a basis to build a numerical model within the Churchill Kivalliq corridor. This new model will be used in future studies that incorporate the electrical power transmission system parameters to estimate the potential effect or risk of GICs caused by space-weather events on this critical power grid.

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