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

Fig. 8.

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

Fig. 8.

Power spectral density of the magnetic variation at Aso station. The spectra of the Horizontal (H) and Declination (D) components are shown. Two peaks in the H component at 275 s and 230 s appear just after the origin time, which correspond to the fundamental, and the first overtone, of the resonance modes, respectively. A small peak at 250 s also appears in the D component, which may correspond to the peak seen in the barometric data obtained at Shigaraki.

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