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Earth, Planets and Space
Fig. 2. | Earth, Planets and Space

Fig. 2.

From: Continuous long-term array analysis of seismic records observed during the 2011 Shinmoedake eruption activity of Kirishima volcano, southwest Japan

Fig. 2.

Waveforms and particle motions recorded by the KR07 station (location in Fig. 1) filtered in the 2–3 Hz band for the beginning part of the explosive event at 23:19 JST on 1 February, 2011. (a) Filtered vertical, radial, and transverse waveforms. The radial direction is from the crater to the station; the transverse direction is perpendicular to the radial direction and clockwise. Particle motions of the signals within the windows marked by solid lines (P wave) and dashed lines (S wave) are plotted in (b) and (c), respectively. Particle trajectories start at the circles and end at the triangles. (b) The left panel, where vertical motion is plotted against radial motion, displays P wave motion with subhorizontal incidence. (c) The left panel, where vertical motion is plotted against radial motion, displays S wave motion. The middle and right plots (vertical-transverse and radial-transverse) show that both SV and SH components were present in the wavefield.

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