Fig. 5From: Tectonic tremors immediately after the 2011 Tohoku-Oki earthquake detected by near-trench seafloor seismic observationsPower spectral density of tremor #1–7, repeating earthquake-A and -B, remote earthquake, and background noise in horizontal components. Known very low-frequency earthquake (VLFE) #1 has lower power than those of the other tremors in all frequency bands. VLFE #6 lacks power in a frequency range of 1–2 HzBack to article page