Fig. 4From: Tectonic tremors immediately after the 2011 Tohoku-Oki earthquake detected by near-trench seafloor seismic observationsVariation of maximum horizontal amplitude among the ocean-bottom seismometers (OBSs) stations. The maximum horizontal amplitudes in 2–4 Hz at four stations (AO.S01 to S04) are normalized to that at station AO.S05. Mean and standard deviations for the seven tremors are indicated by error barsBack to article page