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Earth, Planets and Space
Figure 4 | Earth, Planets and Space

Figure 4

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

Figure 4

Amplitude of ACROSS source observed at the stations on and around Sakurajima Island. Open circles and squares show the root mean square (RMS) amplitudes of three components by a single sinusoidal source at 10.01 Hz, corresponding to the source in radial and transverse linear vibration, respectively. Pluses and stars show RMS amplitudes for signals with FM operation in radial and transverse vibrations, respectively. 10.01r and 10.01 t indicate the radial and transverse vibrations, respectively, for single sinusoidal source at the 10.01-Hz operation. FM r and FM t indicate the radial and transverse vibrations, respectively, for FM operation. The RMS amplitudes for the FM signal are calculated for the spectral peaks between 10.0 and 15.0 Hz. Station codes are labeled with the markers of 10.01r.

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