霧島火山群中南東部の比抵抗構造

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Kirishima Volcanoes, located in southern Kyushu, are a group of more than 20 volcanoes. At least 3 volcanoes have historic records of eruptions, and more than 10 volcanoes were active within the past 22,000 years. This suggests that Kirishima is a multi-active volcanic group, which might have a complex system of magma supply. Therefore, it is interesting to reveal the structure and the magma supply system for the further understanding of volcanic processes including locations of magma reservoirs, magma rising process before eruptions and causes of related phenomena. In 1994, a joint experiment was conducted on Kirishima Volcanoes by a group of scientists from national universities under the National Research Project for the Prediction of Volcanic Eruptions. The experiment was carried out by seismological, electromagnetic and other geophysical and geochemical methods. This paper presents a resistivity structure of Kirishima Volcanoes revealed by a magnetotelluric (MT) survey and discusses a magma supply system. MT survey was conducted by using more than 10 sets of portable MT instmment to reveal the resistivity structure of the central and the southeastern part of Kirishima Volcanoes. This survey follows the previous survey in 1993 by Utada et al. (1994a), which covered the northern and the central part of Kirishima. Simultaneous magnetic and electric field variations were measured in the ULF, ELF and VLF bands.
特定非営利活動法人日本火山学会の論文
1996-11-30

霧島火山群中南東部の比抵抗構造

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