Japan Geoscience Union Meeting 2019

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[J] Oral

S (Solid Earth Sciences ) » S-VC Volcanology

[S-VC36] Volcanic and igneous activities, and these long-term forecasting

Sun. May 26, 2019 10:45 AM - 12:15 PM A07 (TOKYO BAY MAKUHARI HALL)

convener:Teruki Oikawa(GSJ, National Institute of Advanced Industrial Science and Technology), Takeshi Hasegawa(Department of Earth Sciences, College of Science, Ibaraki University), Daisuke MIURA(Department of Physical Science, Graduate School of Science, Osaka Prefecture University), Nobuo Geshi(Geological Survey of Japan, The National Institute of Advanced Industrial Science and Technology), Chairperson:Nobuo Geshi(GSJ/AIST), Daisuke Miura

10:45 AM - 11:00 AM

[SVC36-07] Caldera structure delineated by airborne gravity gradiometry

*Atusi NINOMIYA1, Hiromasa ISHIKAWA1, Shunsuke NOGAMI1, Yoshio NAKASATO1 (1.Sumiko Resources Exploration and Development Co., Ltd.)

Keywords:airborne gravity gradiometry, caldera structure

The airborne gravity gradiometry (e.g., JOGMEC, 2017) revealed that collapsed caldera shows a polygonal structure consisting of a combination of fractures in the direction along the caldera contour and radial fractures cutting through them. This structure is commonly found in the Quaternary calderas such as Kutcharo caldera, Teshikaga caldera, Sen-Yakeyama caldera, Sanzugawa caldera, Southern Kurikoma volcano caldera, Onikobe caldera, Hanayama caldera, Shiobara caldera, Shishimuta caldera, and Aso caldera.
Three-dimensional inversion of the airborne gravity gradiometry data enables to stereoscopically visualize the caldera structure.

Reference: JOGMEC, 2017, Report of survey on the potential of geothermal resources.