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Fig. 1 | Earth, Planets and Space

Fig. 1

From: A simple method to evaluate the air-to-ground coupling efficiency: a tool helping the assessment of seismic/infrasonic energy partitioning during an eruption

Fig. 1

Infrasound from an explosion, at 22:38 (hh:mm JST) on 13 January 2011, of Sakurajima volcano recorded by an infrasound sensor (a) and a broad-band seismometer (b) at the SMN station near Kirishima volcano, 42 km to the north of Sakurajima in southern Kyushu, Japan (c). The vertical dashed lines in a and b indicate 0, 10, 130 s after the arrival of the explosion signal. The amplitude (d) and phase (e) response of the ground velocity to incident infrasound at the SMN station. The red dots represent the response function at 1–7 Hz used by Ichihara (2016). All the plots are reproduced from Ichihara (2016), but the phase delay in e has been converted from the range of \([-\pi ,\pi ]\) to \([-2\pi ,0]\)

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