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

Fig. 8

From: Spatio-temporal characteristics of frictional properties on the subducting Pacific Plate off the east of Tohoku district, Japan estimated from stress drops of small earthquakes

Fig. 8

Spectral ratios for source models of Brune (1970) (blue) and Boatwright (1978) (red) as a function of frequency. Two panels have different corner frequencies of analyzed and EGF earthquakes (\(f_{0A}^{C}\) and \(f_{0E}^{C}\)); (a) 2.0 and 6.0 Hz and (b) 2.0 and 30.0 Hz, respectively, which are shown by black arrows. The factor \(R_{r}^{C}M_{0r}\) in Eqs. (9) and (14) is set to 10.0. We can clearly see that spectral ratios get asymptotically close to values of \(R_{r}^{C}M_{0r}\) and \(R_{r}^{C}M_{0r} \cdot \left( f_{0A}^{C}/f_{0E}^{C}\right) ^{2}\) for \(f \rightarrow 0\) and \(f \rightarrow +\infty\), respectively

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