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Earth, Planets and Space
Fig. 3 | Earth, Planets and Space

Fig. 3

From: Detecting multiscale periodicity from the secular effusive activity at Santiaguito lava dome complex (Guatemala)

Fig. 3

The discrete Fourier transform analysis showing the a yearly (main frequencies at 0.023, 0.055, 0.078 and 0.102); b monthly (0.025, 0.055, 0.070, 0.084) and (c) weekly (0.019, 0.039, 0.058) power density spectrum of the discharge rate from 1922 to 2021. The equivalent periods for the detected frequencies are given in each plot. For the monthly and weekly time-series, the data cover the last 21 years (2000–2021). The red dashed lines indicate the frequencies showing the best agreement with the periodicities observed in the Morlet analysis (Fig. 4)

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