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Progress in Earth and Planetary Science
Fig. 9 | Progress in Earth and Planetary Science

Fig. 9

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

Fig. 9

Relationship between slope of power spectral density at 1–4 Hz, and average of power at 2–4 Hz band for the events with amplitude deviation smaller than the tremor detection threshold. The waveforms of the events showing power spectral density slopes similar to or smaller than that of tremor #5 (indicated as a to h in the top panel) are shown in the bottom two rows. The red and black lines show vertical and horizontal components, respectively. The brackets show the locations of the detection windows

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