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Earth, Planets and Space
Fig. 8 | Earth, Planets and Space

Fig. 8

From: Development of a laboratory monitoring system for elastic waves transmitted through sand under dry and nearly saturated conditions

Fig. 8

Spectral amplitude ratios between dry and nearly saturated conditions. See “Monitoring capability for water content change in our system” section for definitions of a \(\left|\frac{{U}_{\mathrm{ref}}^{\mathrm{sat}}(t, f)}{{U}_{\mathrm{ref}}^{\mathrm{dry}}(t, f)}\right|\) and b \({R}_{i}(t, f)\). Gray and black lines represent the amplitude ratios for each stacked waveform and their averages, respectively

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