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TitleOne-dimensional layered Earth models of Canada for GIC applications, part 2: Detailed description
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorTrichtchenko, LORCID logo; Fernberg, P A; Boteler, D HORCID logo
SourceGeological Survey of Canada, Open File 8595, 2019, 586 pages, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is related to One-dimensional layered Earth models of Canada for GIC applications, part 1: General description
File formatpdf (Adobe® Reader®)
ProvinceCanada; British Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador
NTS1; 2; 3; 10; 11; 12; 13; 14; 15; 20; 21; 22; 23; 24; 25; 30; 31; 32; 33; 34; 35; 40; 41; 42; 43; 44; 52; 53; 54; 62; 63; 64; 72; 73; 74; 82; 83; 84; 92; 93; 94; 102; 103; 104; 114
Lat/Long WENS-141.0000 -50.0000 63.0000 41.7500
Subjectsgeophysics; regional geology; surficial geology/geomorphology; Science and Technology; Nature and Environment; geomagnetism; geomagnetic fields; models; modelling; geoelectric variations; resistivity; magnetotelluric interpretations; bedrock geology; lithology; structural features; tectonic elements; sediments; anomalies; conductivity; electric power; Canadian Magnetic Observatories; Infrastructures
Illustrationsgeoscientific sketch maps; tables; models; profiles; location maps; stratigraphic cross-sections; cross-sections; schematic representations; block diagrams
ProgramPublic Safety Geoscience Northern Canada Geohazards Project
Released2019 07 18
Evaluation of the impacts of space weather on ground infrastructure requires information on the size of geomagnetically induced (telluric) currents. For estimation of these currents in places where they are/were not recorded, numerical modelling needs to be employed. The most common approach in the modelling of geomagnetically induced currents is based on knowledge of the geoelectric field driving these currents. Because there are no continuous measurements of the geoelectric fields in many areas where the power networks are located, the common method is based on utilisation of the available geomagnetic observations recorded in the area together with the surface impedance of the Earth, derived from short-duration magnetotelluric surveys.
The compilation of two reports (main, Part 1, OF 8594 and supplementary, Part 2, OF 8595) presents one-dimensional Earth resistivity models and corresponding surface impedances for 10 Canadian provinces (located below 60 degrees in latitude), as derived from the available publications. The presented supplementary report provides a set of 10 Appendices with the detailed descriptions of the geological settings of each province, justification for choice of areas (zones) with one-dimensional models for each province and values of resistivities at different depths. The information has been originally prepared by Dr. P.A. Fernberg as multiple reports and then significantly edited for consistency and for omitted information by Dr. L. Trichtchenko.
The presented detailed descriptions with justification for values of the Earth resistivity models for each province, as well as the locations of the identified zones, together with the list of references of the sources of information are presented in the Appendices separately for each province for convenience of users. These detailed descriptions can serve for better justification of the chosen geoelectrical parameters and location of defined zones and give the opportunity to update the specific parameters when the new information becomes available.
General descriptions of layered Earths resistivity models for each province are presented in: Trichtchenko, L., Fernberg, P.A., Boteler, D.H., 2019. One-dimensional Layered Earth Models of Canada for GIC Applications. Part 1. General Description; Geological Survey of Canada, Open File 8594, 66 pp.
Summary(Plain Language Summary, not published)
Space weather refers to the dynamic conditions on the Sun and in the space environment, in particular, in the near-Earth environment, that can affect critical infrastructure. NRCan operates the Canadian Space Weather Forecast Centre and conducts research into space weather effects on power systems, pipelines, radio communications and GNSS positioning to help Canadian industry understand and mitigate the effects of space weather. The report presents the set of Earth conductivity models for Canadian provinces. These new models are important for assessment of the space weather hazards on the power grids and pipelines.

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