Surface subsidence during caving caldera revealed by the precise atmospheric pressure measurement

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We installed two micro barometerers in the Izu-Oshima volcano Island, one at Mihara-nishi and one at Noma Mabushi each equipped with a Tekelec MB2005 sensor. We published a paper on the long-period harmonic ground motion with periods of 270 and 230 sec. We have concluded the the harmonic ground motion resulted from the resonant oscillation between the solid Earth seismic surface waves and the atmospheric acoustic waves. In 2011 January Shinmoe-dake violently erupted and sonic booms from the eruption caused some damage to the building glass windows. We started temporal infrasound observation at 4 sites ( ERI volcano observatory, Kishishima-office of Kishishima-city, Eboshi observation point, Ohhata observation point).