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

Fig. 1

From: Spatial pattern in stress drops of moderate-sized earthquakes on the Pacific Plate off the south-east of Hokkaido, Japan: implications for the heterogeneity of frictional properties

Fig. 1

a Seismicity in the study region from 2002 to 2015. Hypocenters with M greater than or equal to 3.0, as determined by JMA, are plotted. The color and size of the symbols indicate the depth and magnitude of earthquakes, respectively. We can clearly see that most earthquakes occur on the subduction interface of the Pacific Plate. b Hypocenters of analyzed earthquakes and seismic stations used in this study. The red circles indicate hypocenters, and the blue squares indicate seismic stations, including stations of Hi-net (NIED), JMA, and Hokkaido University. The orange lines indicate the depth of the upper surface of the subducting Pacific Plate (Kita et al. 2010) at intervals of 20 km. Waveforms observed at the station N.TKIH are shown in Figs. 2 and 3 as examples

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