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Fig. 1 | Earth, Planets and Space

Fig. 1

From: RETRACTED ARTICLE: Estimation of the source process and forward simulation of long-period ground motion of the 2018 Hokkaido Eastern Iburi, Japan, earthquake

Fig. 1

a Map of the study area. Solid triangles and triangles outlined with thin lines indicate the stations used in the source inversion (SI, Fig. 3), and the stations used to compare observation and forward ground-motion simulation (FS, Fig. 4), respectively. Triangles outlined with thick lines indicate the stations used in both analyses (SI and FS). The color of the triangles indicates the observation network: blue, red, and green are KiK-net, K-NET, and F-net, respectively. Black and coral stars indicate the epicenters of the 2018 Hokkaido Eastern Iburi earthquake and the aftershock (MJMA 5.4) at 6:11 JST on September 6, 2018, respectively. Focal mechanisms refer to the F-net moment tensor solutions. The black line denotes the outline of the curved fault model used in the source inversion. Magenta lines denote the surface traces of the active fault zone along the eastern margin of the Ishikari lowland (AIST 2007). b Map view of the curved fault model. Circles denote hypocenters of the aftershocks (M ≥ 1) within 1 day after the mainshock. The color of the circles indicates the event depth.c Distribution of strike angle on the curved fault model

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