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Observations in various parts of the world show marked inconsistencies in the apparent deformations produced by earth-tides; such variations may in large part result from errors of measurement. However, horizontal variations in crustal composition must produce effects of this kind, and accordingly an attempt has been made to estimate the order of magnitude of such anomalies. The very complicated elastic problem could be solved numerically if we had any idea of the changes of composition involved. In default of such information, a two-dimensional model has been investigated, using a method of successive approximation. Two cases are of special interest--(1) where changes of elastic constants are appreciable within a small fraction of the circumference of the Earth, and (2) here the wave-length is one-half of the Earth's circumference.
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