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

Fig. 8.

From: Switching from seismic to seismo-acoustic harmonic tremor at a transition of eruptive activity during the Shinmoe-dake 2011 eruption

Fig. 8.

The time correlation between SHT-SAHT switching and other observations. Open triangles show the time windows in which SHT events are recognized, and solid triangles show SAHT events. The switching occurred during the night of January 31st and corresponds with the inferred end of magma discharge from the main magma chamber, illustrated by the change in the east-west component of tilt at KITK (a), changes in the intermittency of the pulses in seismic (b) and acoustic (c) signals from frequent small explosions to less-frequent strong explosions, and rapid decrease in the height of the lava surface (d) all coincide with the SHT-SAHT switching. The vertical broken lines indicate changes of the eruptive activity. The timing of the onset of lava effusion is not known. The thin broken lines mark changes of the features of the signals. The black line in (d) at 1350 m indicates the limit of the visibility inside the crater.

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