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

Fig. 3.

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

Fig. 3.

Onset of an explosion earthquake at 23:19 JST on 1 February, 2011, in the 2–3 Hz band, recorded by the seismic array along with analytical results. The time axis starts at 23:19:15 JST. Shown from top to bottom are the seismograms of the 15 array channels, the semblance values, the apparent slowness, and the back azimuth. Solutions with semblance values greater than 0.7 (dashed line) are shown with open circles and the others with dots. Vertical lines with circles indicate the uncertainties of the solutions. The region in the apparent slowness and back azimuth panels with semblance values above 90 percent of the maximum provides an estimate of the uncertainty of the solution. The dashed line in the back azimuth panel represents the direction from the array center to the crater of Shinmoedake. The vertical gray bands indicate wave arrivals discussed in the text; the P and S arrivals are also shown in Fig. 2.

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