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

Fig. 1

From: Application of a simplified calculation for full-wave microtremor H/V spectral ratio based on the diffuse field approximation to identify underground velocity structures

Fig. 1

Comparison between FW H/V, SW H/V, ellipticity of fundamental mode of Rayleigh waves of target two-layered medium, and SW H/V of cap-layered media. Left: ellipticity of fundamental mode of Rayleigh waves (thin black), FW (thick black) and SW (gray) H/Vs of target two-layered medium of which the S-wave velocity in the second layer (V s2) is three times as large as that in the first layer (V s1). Middle: FW H/V of target two-layered medium and SW H/Vs of three cap-layered media of which the depths of upper interface of cap layer are 2.5 times (gold), 5.0 times (red), and 10 times (blue) the wavelength (λ 0, corresponding to fundamental mode of target two-layered medium), and the S-wave velocities of cap layer (V sCap) = 2V s2. Right: SW H/Vs of three cap-layered media of which V sCap = 1.2V s2 (gold), V sCap = 1.5V s2 (red) and V sCap = 4.5V s2 (blue), and the depths of upper interface of cap layer are 10λ 0

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