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Earth, Planets and Space
Fig. 3 | Earth, Planets and Space

Fig. 3

From: Identification of infrasonic and seismic components of tremors in single-station records: application to the 2013 and 2018 events at Ioto Island, Japan

Fig. 3

Power spectral features of tremors (magenta) and background noise (black). The symbols show the values of the meaningful frequency bands selected by step ⑤ of the text. a, b The upper magenta line with the upward triangles is \(P_W\), and the associated black line is \(P_W^b\), on the left axis. The lower magenta line with inverted triangles is \(P_P\), and the associated black line is \(P_P^b\), on the right axis. c, d The spectral amplitude ratio between seismic record and infrasonic record, \((w/p)_{\text{obs}}\), as a function of frequency. The horizontal dashed line indicates the theoretical value for the ground-to-atmosphere wave calculated by Eq. (2) with \(\alpha\) = 340 m/s and \(\rho\) = 1.16 kg/m\(^3\)

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