GEOSCAN, résultats de la recherche

Menu GEOSCAN


TitrePresent-day tilting of the Great Lakes region based on water level gauges
AuteurMainville, A; Craymer, M R
SourceGeological Society of America Bulletin vol. 117, no. 7-8, 2005 p. 1070-1080, https://doi.org/10.1130/B25392.1
Année2005
Séries alt.Secteur des sciences de la Terre, Contribution externe 2005661
ÉditeurGeological Society of America
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1130/B25392.1
Mediapapier; en ligne; numérique
Formatspdf
ProvinceOntario
SNRC30; 31C; 31D; 31E; 40; 41; 42C; 42D; 52A
Lat/Long OENS -93.0000 -75.0000 49.0000 41.0000
Sujetslacs; niveaux d'eau; mouvements de la croûte; inclinaison de la croûte; évolution postglaciaire; modèles; isostasie; relèvement isostatique; analyses du comportement des surfaces; gestion des ressources; eaux de surface; méthodes statistiques; géodésie par satellite; budget hydrologique; bathymétrie; systèmes de satellites de navigation; tectonique; géologie régional; hydrogéologie
Illustrationssketch maps; tables; time series
ProgrammeService canadien de géodésie
Résumé(disponible en anglais seulement)
By using monthly mean water levels at 55 sites around the Great Lakes, a regional model of vertical crustal motion was computed for the region. In comparison with previous similar studies over the Great Lakes, 15 additional gauge sites, data from all seasons instead of the 4 summer months, and 8 additional years of data were used. All monthly water levels available between 1860 and 2000, as published by the U.S. National Ocean Survey and the Canadian Hydrographic Service, were used. For each lake basin, the vertical velocities of the gauge sites relative to each other were simultaneously computed, using the least-squares adjustment technique. Our algorithm solves for and removes a monthly bias common to all sites, as well as site-specific biases. It also properly weighs the input water levels, resulting in a realistic estimation of the uncertainties in tilting parameters. The relative velocities obtained for each lake were then combined to obtain relative velocities over the entire Great Lakes region. Finally, the gradient of the relative rates for the regional model was found to agree best with the ICE-3G global isostatic model of Tushingham and Peltier, whereas the ICE-4G gradients were too small around the Great Lakes.
GEOSCAN ID221708