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Earth, Planets and Space
Fig. 2 | Earth, Planets and Space

Fig. 2

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. 2

H/Vs, imaginary parts of the Green’s functions, and medium responses of Love and Rayleigh waves of target two-layered (V s2 = 3V s1) and the corresponding cap-layered medium (V sCap = 2V s2, Depth = 10λ 0). Upper left: FW H/V (thick black), SW H/V (gray) and ellipticity (thin black) of fundamental mode of Rayleigh waves for target two-layered medium. Upper middle: imaginary parts of the Green’s functions in the horizontal component for FW (thick black), SW (gray) of target two-layered medium, and for SW (red), Love waves (blue) and Rayleigh waves (brown) of cap-layered medium. Upper right: imaginary parts of the Green’s functions in the vertical component for FW (thick black), SW (gray) of target two-layered medium, and for SW (red) of cap-layered medium. Lower left: medium responses (dot) of Love waves of target two-layered medium and those (solid curves) of cap-layered medium. Lower middle: horizontal medium responses (dot) of Rayleigh waves of target two-layered medium and those (solid curves) of cap-layered medium. Lower right: vertical medium responses (dot) of Rayleigh waves of target two-layered medium and those (solid curves) of cap-layered medium. The numbers denote the orders of normal modes of surface waves, e.g., 0 denotes the fundamental mode (black), 1 denotes the first higher mode (red), 2 the second higher mode (blue), 3 the third higher mode (cyan), 4 the fourth higher mode (thin black) and 5 the fifth higher mode (purple)

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