Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Summary Previous studies of this subject have indicated that the whole Great Lakes area is slowly tilting upwards to the north and east (or downward to the south and west). It has been assumed that this is an upflit of the crust, resulting from the removal of the ice cap of the Glacial Period. In the above paper, some examples are given of the evidence for this tilting, provided by records of water level gauges around the Great Lakes. These records are also studied from the point of view of seasonal variations. It is definitely established that the relationship between the earth’s crust and the direction defined by the water surface is undergoing change, both progressive (as reported in previous papers) and seasonal. The seasonal variations are somewhat irregular. In considering possible causes of these variations, the conclusion is reached that the seasonal variation is a departure of the water surface from level, due to meteorological causes. The progressive change has usually been ascribed to a tilting of the earth’s crust, but it is pointed out that the same results would be observed if the crust were rigid and the direction of gravity were changing. This would imply a change in the form of the geoid. Some support for this suggestion is obtained from reports of the International Latitude Service, but the evidence is not conclusive.
Summary Previous studies of this subject have indicated that the whole Great Lakes area is slowly tilting upwards to the north and east (or downward to the south and west). It has been assumed that this is an upflit of the crust, resulting from the removal of the ice cap of the Glacial Period. In the above paper, some examples are given of the evidence for this tilting, provided by records of water level gauges around the Great Lakes. These records are also studied from the point of view of seasonal variations. It is definitely established that the relationship between the earth’s crust and the direction defined by the water surface is undergoing change, both progressive (as reported in previous papers) and seasonal. The seasonal variations are somewhat irregular. In considering possible causes of these variations, the conclusion is reached that the seasonal variation is a departure of the water surface from level, due to meteorological causes. The progressive change has usually been ascribed to a tilting of the earth’s crust, but it is pointed out that the same results would be observed if the crust were rigid and the direction of gravity were changing. This would imply a change in the form of the geoid. Some support for this suggestion is obtained from reports of the International Latitude Service, but the evidence is not conclusive.
Crustal tilting in the Great Lakes area
Lilly, J. E. (Autor:in)
1953
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Geodäsie , Geometrie , Geodynamik , Mathematik , Mineralogie
Great Expectations at Great Lakes
British Library Online Contents | 2002
| Engineering Index Backfile | 1899
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Online Contents | 2015
| Engineering Index Backfile | 1957