Array Measurements of Long-Period Microtremors and Estimation of S-Wave Velocity Structure in the Western Part of the Tokyo Metropolitan Area

Multimodal Rayleigh and Love Wave Joint Inversion for S‐Wave Velocity Structures in Kanto Basin, Japan

“…We used S‐wave velocities of 0.5, 1.0, 1.7, and 3.2 km·s −1 as initial values for the Shimousa (first layer), Kazusa (second layer), Miura (third layer), and pre‐Neogene layers (fourth layer), respectively (Koketsu et al., 2009; Yamanaka & Yamada, 2006). The P‐wave velocities ( V p ) and densities ( ρ ) were fixed using different empirical relationships for sediments (Kitsunezaki et al., 1990; Yamanaka et al., 1994) and basement rock (Koketsu et al., 2009). $$${V}_{p}=\left\{\begin{array}{c}1.11{V}_{s}+1.290\\ 1.0753{V}_{s}+2.1183\end{array}\right.\begin{array}{c}(\mathrm{s}\mathrm{e}\mathrm{d}\mathrm{i}\mathrm{m}\mathrm{e}\mathrm{n}\mathrm{t}\mathrm{s})\\ (\mathrm{b}\mathrm{a}\mathrm{s}\mathrm{e}\mathrm{m}\mathrm{e}\mathrm{n}\mathrm{t}\mathrm{r}\mathrm{o}\mathrm{c}\mathrm{k})\end{array},\,\rho =\left\{\begin{array}{c}-0.536\,\mathit{ln}\left({{V}_{p}}^{-1}\right)+1.635\\ -6.737{{V}_{p}}^{-1}+3.808\end{array}\right.\begin{array}{c}(\mathrm{s}\mathrm{e}\mathrm{d}\mathrm{i}\mathrm{m}\mathrm{e}\mathrm{n}\mathrm{t}\mathrm{s})\\ (\mathrm{b}\mathrm{a}\mathrm{s}\mathrm{e}\mathrm{m}\mathrm{e}\mathrm...$$…”

“…We used S-wave velocities of 0.5, 1.0, 1.7, and 3.2 km•s −1 as initial values for the Shimousa (first layer), Kazusa (second layer), Miura (third layer), and pre-Neogene layers (fourth layer), respectively (Koketsu et al, 2009;Yamanaka & Yamada, 2006). The P-wave velocities (V p ) and densities (ρ) were fixed using different empirical relationships for sediments (Kitsunezaki et al, 1990;Yamanaka et al, 1994) and basement rock (Koketsu et al, 2009).…”