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Fig. 2 | Earth, Planets and Space

Fig. 2

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

Fig. 2

One-and-a-half hour trace view of the vertical components of MVLP observed by Iran’s 26 broadband stations. Columns (a) and (c) show the normalized waveforms, and columns (b) and (d) show the corresponding normalized Fourier amplitude spectra. The traces are ordered from top to bottom by increasing epicentral distance (station name and epicentral distance are displayed). The waveforms are bandpass filtered between 0.01 and 0.1 Hz. Long-lasting, long-period seismic waves are observed to arrive at around 10:00 UTC on November 11, 2018. The Fourier spectra are for unfiltered seismograms. The peak of the spectra (indicated by the gray arrow in the two bottom spectra) is at 0.064 Hz (15.6 s/cycle)

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