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Earth, Planets and Space
Figure 8 | Earth, Planets and Space

Figure 8

From: Active monitoring at an active volcano: amplitude-distance dependence of ACROSS at Sakurajima Volcano, Japan

Figure 8

Mean spectral amplitudes of the signal from shot 2 for two frequency bands at seismic stations. The amplitudes are calculated using the first 10 s after the onset of the initial arrival of the shot signal (see Figure 7). Blue and black dots indicate the mean spectral amplitudes on and off Sakurajima Island, respectively. Blue and black solid lines show the approximation curve from Equation 1 for the stations on Sakurajima Island and all the stations, respectively.

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