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Progress in Earth and Planetary Science
Fig. 7 | Progress in Earth and Planetary Science

Fig. 7

From: Tectonic tremors immediately after the 2011 Tohoku-Oki earthquake detected by near-trench seafloor seismic observations

Fig. 7

Results of waveform classification using amplitude deviation and spectral deviation for the six days when the reported very low frequency earthquakes (VLFEs) occurred. Hexagons represent tremors #1–7, diamonds represent repeating earthquakes, and a square represents remote earthquake. Symbol colors show the maximum amplitude at station AO.S05 at the corresponding time window. Thresholds of spectral and amplitude deviations are shown by vertical and horizontal lines, respectively. The spectral and amplitude deviations calculated for repeating earthquake-A, repeating earthquake-B, and a remote earthquake are also shown, although these earthquakes occurred on different days. The spectral deviation of tremor #5 is not exactly zero in the figure since the time window including tremor #5 in the event search is slightly different from that for the reference power spectral density calculation

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