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Progress in Earth and Planetary Science
Fig. 11 | Progress in Earth and Planetary Science

Fig. 11

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

Fig. 11

The number of detected events of various types in a 15-day interval following the occurrence of the mainshocks. a The number of tremors in 2011 identified in the present study. Time period before ocean-bottom seismometer (OBS) deployment (April 11, 2011) is covered. The vertical dashed lines show the occurrence times of M6.9 and M6.6 earthquakes. b Schematic illustration of aseismic slip behavior as suggested by the tremor activity. c The number of all the regular earthquakes reported by the Japan Meteorological Agency in 2011. The area of the rectangle in Fig. 1 is the same as that for repeating earthquakes. d The number of regular earthquakes reported by Japan Meteorological Agency post the Mw 7.1 Sanriku-Oki earthquake on 2 November 1989. e The number of repeating earthquakes in 2011 (Uchida and Matsuzawa 2013). f The number of repeating earthquakes in 1989 (Uchida and Matsuzawa 2013). g The number of very low frequency earthquakes (VLFEs) recorded in 2011 (Baba et al. 2020). Timings of the seven VLFEs reported by Matsuzawa et al. (2015) are indicated by inverted triangles

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