海底火山から採取した軽石試料を用いて、水中軽石中の気泡の成長履歴を明らかにする

FY26开发了一个模型，使用FTIR测量的水形态（OH和分子H2O）校正喷发后水合作用。然而，从总H2O浓度间接获得的OH的准确测量是必不可少的。FY27推导了一个使用种属相关摩尔吸光系数的公式，以准确获得OH，从而重建原始总H2O含量。应用该方法对伊豆岛弧大室田和黑濑西海底火山的浮岩进行了分析，得到了与浮岩结构相关的水的总量，并对流纹岩玻璃的FTIR光谱中硅酸盐峰进行了分析。虽然这些提供了一种估计玻璃厚度的方法，但它们也会干扰分子H2O峰。

FY26 a model was developed to correct for post-eruption hydration using water speciation (OH and molecular H2O) measured by FTIR. However, accurate measurement of OH, obtained indirectly from total H2O concentration, is essential. FY27 a formula using species-dependent molar absorption coefficients was derived to accurately obtain OH to reconstruct original total H2O contents. Applying this to pumice from Oomurodashi and Kurose-Nishi submarine volcanoes in the Izu Arc gives reconstructed total H2O contents that relate to pumice texture.A better understanding of silicate peaks that appear on FTIR spectra of rhyolite glass has also been obtained. While these provide a means to estimate glass thickness they also interfere with the molecular H2O peak.