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Review of Apparent Vertical Movement Rates in the Great Lakes Region

Jacob Bruxer;Chuck Southam
Provides updated comparisons of water level differences over time between pairs of gauges on a given lake in order to estimate the relative rate of apparent vertical movement between gauge pairs. While water level differences can not be used to estimate relative rates of movement from one lake to another, they can be used to estimate the rates of movement between gauge pairs on a single lake. Observed vertical movement between gauge pairs is generally believed to be the result of glacial isostatic adjustment, or the slow rebounding of the earth's crust as a result of removal of the weight of the glaciers some 10,000 years ago. However, the results of this review showed that vertical movement rates are not always linear, but in some cases show stepped, shifted or variations in their rates of movement. Possible causes of these observations are proposed in some cases.
Review of Apparent Vertical Movement Rates in Great Lakes
Rates of Vertical Movement Relative to Lake Outlet Summary
Viewable Data:
Great Lakes Gauge Stations Monthly Mean Water Levels
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Supporting Content (Show)
Main Topics
St. Clair River
Questions We Asked
How has GIA affected Michigan-Huron and Erie level relationship?
Key Findings
GIA accounts for 4-5 cm of total head decline
Remedial measures should not be taken in the St. Clair
Glacial Isostatic Adjustment Analysis