Abstract
To use leveling most effectively in determining crustal movements, it is necessary to have two sets of precise measurements separated by a reasonable time interval. But this is not enough! It is necessary that systematic errors that vary with time must be removed. As an example, an astronomical correction of 70 millimetres is computed for a line running from Spokane, Washington, to San Diego, California, (12° latitude change). A systematic refraction correction of 33.8 millimetres over a line 46 kilometres long in California is computed using average weather data. It is recommended that such corrections should be applied in computing crustal movements, and it is suggested that a map of rates of vertical movements in North America would be useful.
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