Skip to main content
Earth, Planets and Space
Fig. 2 | Earth, Planets and Space

Fig. 2

From: Blind study site assessment of shear-wave velocity at Kumamoto City, Japan, using direct-fitting SPAC methods

Fig. 2

a Locality for mid-size arrays in Kumamoto City, Japan. Dotted yellow lines—the “radii” of an asymmetric “triangle” centered on M1. Dashed yellow—sides of the asymmetric triangle. Red circles show a pair of nested triangles side lengths 122 and 244 m. Stations M2, M3, M5 are corrupted by low-frequency noise below1.5 Hz. Small arrays SM, S and SS1 (apertures 78, 20 and 2 m) are centered close to station M4. b, c SPAC spectra for the inner, outer triangles of array M, apertures 122, 244 m. Colors as for Fig. 1. Thick black line—the frequency range 1.5–3.5 Hz used in the curve fitting. d, e krSPAC spectra for the (unequal) radii and (unequal) sides (average lengths 117 and 192 m respectively) of the asymmetric traingle shown in (a). Thick black line—the kr range used in the curve fitting, equivalent to an extended frequency range 0.5–3.5 Hz

Back to article page