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Earth, Planets and Space
Fig. 1 | Earth, Planets and Space

Fig. 1

From: Spatio-temporal characteristics of frictional properties on the subducting Pacific Plate off the east of Tohoku district, Japan estimated from stress drops of small earthquakes

Fig. 1

a Seismicity around the study region from 2003 to 2018. Hypocenters with M equal to or greater than 3.0, as determined by JMA, are plotted. The size and color of the symbols show the magnitude and depth of earthquakes, respectively. It is clearly described that most earthquakes take place on the subduction interface of the Pacific Plate. b Epicenters of analyzed earthquakes and locations of seismic stations used in this study. The red circles show hypocenters, and the blue squares represent seismic stations, including stations of Hi-net (NIED), JMA, Hokkaido University, Hirosaki University, and Tohoku University. The depth of the upper surface of the subducting Pacific Plate is indicated by orange lines with an interval of 20 km (Kita et al. 2010; Nakajima and Hasegawa 2006; Nakajima et al. 2009). Waveforms observed at the stations N.TROH and N.IWEH are displayed in Figs. 2, 10, 11, and 12

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