Japan Geoscience Union Meeting 2023

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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 21, 2023 9:00 AM - 10:15 AM 303 (International Conference Hall, Makuhari Messe)

convener:Takeshi Hasegawa(Department of Earth Sciences, College of Science, Ibaraki University), Shimpei Uesawa(Central Research Institute of Electric Power Industry), Teruki Oikawa(GSJ, National Institute of Advanced Industrial Science and Technology ), Koji Kiyosugi(Kobe Ocean-Bottom Exploration Center, Kobe University), Chairperson:Ayumu Nishihara(Research Institute of Earthquake and Volcano Geology, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology), Takeshi Hasegawa(Department of Earth Sciences, College of Science, Ibaraki University)

9:30 AM - 9:45 AM

[SVC36-03] Rapid Growth of Niigata Yakeyama Volcano - Based on the Age of the Latest Magmatic Eruption, Otani Pyroclastic Flow Deposit II

*Teruki Oikawa1, Kenji Hayatsu2 (1.GSJ, National Institute of Advanced Industrial Science and Technology , 2.Myoko Volcano Research Laboratory)

Keywords:volcanic evolution, eruption history, precise dating, 14C dating, wiggle-matching, tree rings

We precisely dated the latest magmatic eruption of the Niigata Yakeyama Volcano. 14C wiggle-matching was performed on a charred tree that has a countable 10-year annual ring with bark from the latest magmatic eruption deposit, Otani Pyroclastic Flow Deposit II. In result, the age of outermost tree ring formation is 1444-1474 cal AD. 14C wiggle-matching and calendar year calibration were performed using Oxcal 4 (Ramsey, 2009) and IntCal20 (Reimer et al. (2020). We conclude that the Otani Pyroclastic Flow Deposit II is dated to the late 15th century, rather than the 18th century as previously thought. The Niigata Yakeyama Volcano erupted violently and grew rapidly for about 300 years after the eruption of the Hayakawa pyroclastic flow deposits in the 13th century, producing about 3 km3 of magma. The recent eruptive activity of the volcano has been relatively small in scale, no-magmatic eruptions for the last 500 years.