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Earth, Planets and Space
Fig. 3 | Earth, Planets and Space

Fig. 3

From: Investigation of the subsurface structure at the target site in Kumamoto, Japan, and the distributed data of the blind prediction exercise: report for the experiments for the 6th international symposium on effects of surface geology on seismic motion

Fig. 3Fig. 3

Borehole log with N-values obtained from SPT. a Depth of 0 m to 16.3 m, b depth of 16 m to 39.44 m. The soil conditions shown in the far left of the figure are listed in Table 1. The upper 28 m is mostly sandy layers with N-values of about 20 or less, except between depths of 16 and 19 m where N-value becomes close to 30. The N-value becomes low again at about 22 m where there is a silt layer about 3 m thick. The sandy layer reappears down to 31 m where the gravel layer appears and the N-value reaches 50 at 33 m depth. The detailed depth locations of the samples T-1, T-2, Tr-3, Tr-4 and T-5 are shown on the far right of the figure and are presented in Table 3, Additional file 1: Tables S2 and S3. As for the sampling method, “T” stands for “thin-walled tube sampling” and “R” is for “rotary triple-tube sampling”

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