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1D-O1-1605 PDF
地球科学におけるヘリウム同位体のオンサイト連続測定の重要性
Helium is one of the key elements with direct information on the Earth's interior, because its inert nature makes the behavior follow physical processes. There are two stable isotopes of 3 and 4 in mass number, and 4-helium is mainly derived from α-particles generated by the decay of uranium and thorium. The inert and radiogenic properties make the 3He/4He ratio of each reservoir significantly different on the Earth. The isotope ratio is known to change with the occurrences of volcanic eruptions and earthquake form previous observations. The previous observations have been carried out once every several months to several years, and have provided extraordinary advances in our understanding of the crustal events. On-site continuous measurements, which is sampling once every few minutes, could reveal detail changes for crustal structure. The continuous measurements are critical to understand the behavior of volcanic eruptions and earthquakes occurrence and are expected to useful for their prediction.