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

Fig. 1

From: Subsurface velocity structure and site amplification characteristics in Mashiki Town, Kumamoto Prefecture, Japan, inferred from microtremor and aftershock recordings of the 2016 Kumamoto earthquakes

Fig. 1

Maps showing epicenters of recorded aftershocks and locations of temporary aftershock observation sites. a Colored circles indicate the locations of 30 aftershocks recorded at the temporary aftershock observation sites. The size of a circle corresponds to the JMA magnitude (Mj) and the color corresponds to the hypocentral depth. Two stars and small black dots indicate epicenters of the largest foreshock (Mj 6.4) and the mainshock (Mj 7.3) of the 2016 Kumamoto earthquake sequence, and the aftershocks that occurred from April 14 through June 9, 2016, respectively. b Black triangles show the locations of temporary observation sites deployed in Mashiki (S1–S8). Gray triangles indicate the temporary aftershock observation stations deployed by Yamanaka et al. (2016) in the same area (MK01, MK02, MK05 and MK09) and a white triangle shows the location of seismic intensity meter deployed by JMA. Gray squares show the locations of the seismic intensity observation station inside Mashiki town office (MTO) and the KiK-net strong-motion observation station KMMH16 (same location as the Hi-net station N.MSIH) operated during both the largest foreshock and the mainshock. The calculated JMA seismic intensity values at the temporary sites and station KMMH16 (ground surface) during an event that occurred at 22:08 JST on June 12, 2016 (EQ18: Mj 4.3, depth = 7 km) are also denoted in rectangles. Colored circles indicate the ratio of the totally collapsed wooden buildings identified during a field survey (Yamada et al. 2017a)

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