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Fig. 2 | Progress in Earth and Planetary Science

Fig. 2

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

Fig. 2

Characteristics of tremors observed by the ocean-bottom seismometers (OBSs) a Power spectra of the tremor, the repeating earthquakes, and the remote earthquake shown in Fig. 1. Horizontal records at AO.S05 in the time window indicated by brackets in b are used. Background noise is taken from a window of 30 min before the origin time of known very low-frequency earthquake (VLFE) #5. (b) Filtered (2–4 Hz) seismograms during tremor #5, whose location is shown as a green circle in the left top inset of Fig. 1. Vertical and horizontal records are shown by red and black traces, respectively. Epicentral distances are shown in parentheses. The vertical blue line shows the origin time of the VLFE #5. c Filtered (2–4 Hz) seismograms during repeating earthquake-A, d Filtered (2–4 Hz) seismograms during a remote earthquake (M3.4)

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