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建立了一个模型，利用FTIR测量的水形态（OH和分子H2O）来校正火山爆发后的水化作用。然而，从总H2O浓度间接获得的OH的精确测量是必不可少的。FY27推导出了一种依赖于物种的摩尔吸收系数公式，以准确地获得OH，重建原始总H2O含量。将其应用于伊豆弧乌黑桥和黑西海底火山的浮石，可以重建与浮石结构相关的总H2O含量。对流纹岩玻璃FTIR光谱上出现的硅酸盐峰也有了更好的理解。虽然这些提供了一种估计玻璃厚度的方法，但它们也干扰了分子的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.