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Geothermal Energy Cover Image
Fig. 14 | Geothermal Energy

Fig. 14

From: A machine learning approach for mapping the very shallow theoretical geothermal potential

Fig. 14

Fourier analysis of a ground temperature time series example. The figure shows, for depth of 10 cm, in Bern, during the year 2013: (a) daily average temperature time series over the year, (b) and (d) amplitude and phase of the 30 first frequencies, (c) harmonics for the 3 dominant frequencies (here \(n=1\), \(n=4\) , and \(n=11\)) and resulting Fourier approximation of the signal

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