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TitleImproved modeling of vertical crustal motion in Canada for a new North American reference frame
AuthorRobin, C M I; Craymer, M; Ferland, R; Lapelle, E; Piraszewski, M; Zhao, Y; James, T S
SourceProceedings of the 2016 American Geophysical Union's Fall Meeting; 2016 p. 1
LinksOnline - En ligne
Alt SeriesEarth Sciences Sector, Contribution Series 20160132
PublisherAmerican Geophysical Union
Meeting2016 AGU Fall Meeting; San Francisco; US; December 12-16, 2016
ProvinceCanada; British Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador; Northwest Territories; Yukon; Nunavut
NTS1; 2; 3; 10; 11; 12; 13; 14; 15; 16; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 52; 53; 54; 55; 56; 57; 58; 59; 62; 63; 64; 65; 66; 67; 68; 69; 72; 73; 74; 75; 76; 77; 78; 79; 82; 83; 84; 85; 86; 87; 88; 89; 92; 93; 94; 95; 96; 97; 98; 99; 102; 103; 104; 105; 106; 107; 114O; 114P; 115; 116; 117; 120; 340; 560
Lat/Long WENS-141.0000 -50.0000 90.0000 41.7500
Subjectstectonics; structural geology; Nature and Environment; crustal models; crustal movements; crustal studies; crustal uplift; isostatic rebound; computer applications; remote sensing; software
Illustrationslocation maps; geological sketch maps
ProgramGeodetic Survey, Canadian Spatial Reference System
AbstractA national-scale crustal velocity model has been developed for Canada as part of the current realization of NAD83(CSRS). It is used to propagate coordinates to different reference epochs, and to support scientific studies such as natural hazards related to earthquakes and sea level rise. The current velocity model is based solely on continuous and campaign GPS data between 1994 and 2011.3. To improve on this, a new hybrid model has been created which incorporates a new GPS velocity field with GIA and elastic rebound models for improved accuracy, particularly in northern areas with sparse GPS coverage. Several GIA models and interpolation techniques were tested. Improvements to the GPS velocity field include the addition of new stations in key areas, 5 more years of data, and the reprocessing of all data with the latest software, orbits and antenna calibrations. We include all continuous GPS sites in Canada, the northern portions of the US, all of Greenland, repeated high accuracy campaign surveys of the Canadian Base Network, and a set of global sites used to define the reference frame. Initial uncertainty estimates for the hybrid model are also provided. It is envisaged that such a hybrid model can be used to provide an improved vertical crustal velocity model for a new North American reference system.
Summary(Plain Language Summary, not published)
A product which maps the motion of the terrestrial crust is a critical tool for positioning and surveying, as well as for scientific studies related to natural hazards (such as earthquakes) and climate change adaptation (such as sea level rise). The Canadian Geodetic Survey collects and analyzes GPS data, which is used for Canada's national crustal velocity model. A new hybrid velocity model which integrates geophysical models with a set of new and/or newly analyzed GPS data is presented.