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Progress in Earth and Planetary Science
Fig. 1 | Progress in Earth and Planetary Science

Fig. 1

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

Fig. 1

Locations of ocean-bottom seismometers (OBSs) and known very low-frequency earthquakes (VLFEs). The epicenter of VLFE #3 is the same as VLFE #5. Reverse triangles and hexagons represent OBSs and VLFEs, respectively. Blue circles represent repeating earthquakes that occurred between April 10 and October 25, 2011. Diamond represents a repeating earthquake-A (M3.9) whose seismograms are compared to those of the tremors. Square represents a repeating earthquake-B (M2.7) with the closest hypocenter to tremors. The depth contours of the plate boundary (Nakajima and Hasegawa 2006) are shown by black lines. Black circles indicate the epicenters of tremors (Nishikawa et al. 2019), while dashed line indicates the trench axis of the Japan Trench. The black dots in the inset map on the upper left are Japan Meteorological Agency epicenters of regular earthquakes on March 12, 2011, defining the aftershock area of the 2011 Tohoku-Oki earthquake, whose epicenter is shown by a star

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