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Earth, Planets and Space
Fig. 7. | Earth, Planets and Space

Fig. 7.

From: Barometric and magnetic observations of vertical acoustic resonance and resultant generation of field-aligned current associated with earthquakes

Fig. 7.

Power spectral density of the barometric variation before, and after, the origin time at 03:19 UT on April 15, 2007. Just after the origin time, 03:30–04:30 UT, a sharp peak at period 250 s appears, which is close to, or slightly shorter than, the fundamental mode of the vertical acoustic resonance, and the peak seems to shift to 265 and 275 seconds with time.

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