Fig. 8From: Tectonic tremors immediately after the 2011 Tohoku-Oki earthquake detected by near-trench seafloor seismic observationsExamples of newly detected tremors. Two-hour spectrograms of horizontal components, including a tremor (upper) and three tremors (lower) are shown with temporal variations in amplitude and spectral deviations. Red inverted triangles at the top of the spectrograms represent the detection times of the tremors and seismograms of corresponding tremorsBack to article page