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Earth, Planets and Space
Fig. 5 | Earth, Planets and Space

Fig. 5

From: Observation of the long-period monotonic seismic waves of the November 11, 2018, Mayotte event by Iranian broadband seismic stations

Fig. 5

Spectrograms of the power spectral density (PSD) in the vertical component (left-top) and transverse component (left-bottom), Fourier spectra (right-top), and the dominant periods over time (right-bottom) for the vertical (Z) and transverse (T) components at ASAO station for MVLP (a) and May 15 (b). The dominant periods are plotted by dots, and the lines are piecewise linear interpolations through the data points. Note that periods with a power less than the mean values for the spectrogram are removed from the graph. The gray circle on the Fourier spectra for May 15 indicates a peak of around 0.06 Hz related to the Airy phase of surface waves. This peak is also clearly displayed by the maximum values of PSD on the spectrograms of transverse components

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