Abstract
Abstract The problem of obtaining information about underground heat sources from maps of the surface temperatures and temperature gradients is investigated from a theoretical standpoint. It is shown that the source distribution is not uniquely defined by this surface information and that methods for numerically extrapolating temperature maps are troubled by instability. Two methods are suggested for overcoming these difficulties, both dependent on preconceived ideas about the temperature underground. The first is a numerical method using Poisson&s equation and the second a method of models similar to methods used in the analysis of gravity surveys.
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