Construction of high spatio-temporal resolution resistivity monitoring system at Aso volcano

2016 Fiscal Year Final Research Report

• Project/Area Number: 26350475
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Natural disaster / Disaster prevention science
• Research Institution: Kyoto University
• Principal Investigator: Utsugi Mitsuru 京都大学, 大学院理学研究科, 助教 (10372559)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 比抵抗モニタリング / 熱水系 / 時間変化

Outline of Final Research Achievements

One of the most significant results of our research is that, we had detect the resistivity change due to the magmatic eruption of Aso volcano in 2014.
At Aso volcano, magmatic eruption was occurred in November 2014. As a result of repeated ACTIVE observations around the Nakadake crater, a significant temporal change in the specific resistivity structure accompanying the eruption was detected.
As a result of our observations made in September 2014, before the eruption, and November 2014, just after the eruption, subsurface resistivity was increased at a depth of 100-150 m. In addition, from the results of continuous geomagnetic observations at Kyoto University, it was suggested that the subsurface rocks was heated on the depth of 100-150 m. From these results, it can be inferred that subsurface hydrothermal fluid was pushed out by the rise of high temperature magma, and the subsurface resistivity had increased.

Free Research Field

火山電磁気学