Muography of the active Sakurajima volcano: recent results and future perspectives of hazard assessment

Oláh, László and Tanaka, Hiroyuki K.M. and Ohminato, Takao and Nyitrai, Gábor and Hamar, Gergő and Varga, Dezső (2022) Muography of the active Sakurajima volcano: recent results and future perspectives of hazard assessment. In: International Workshop on Cosmic-Ray Muography, 2021.11., Ghent, Belgium.

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Abstract

Sakurajima volcano is one of the world’s most active volcanoes with over 3,000 of explosive eruptions during the last five years. A muography observatory is under construction in international collaboration since 2017 at a distance of approx. 2,800 m in south-west direction from the active craters. Currently, the Sakurajima Muography Observatory is operating with 11 Multi-Wire-Proportional-Chamber-based Muography Observation Systems that are covering a sensitive surface area of 8.25 square meters. This work is focusing on the volcanological implications of muographic monitoring of Sakurajima: (i) tephra deposition, and erosion of the surface region exist due to heavy rains and post-eruptive lahars; (ii) magmatic plug formation was observed beneath the active craters after the deactivation of Showa crater in 2018 and after a dormant period of Central craters in 2020; (iii) machine-learning-based processing of daily muographic images achieved a fair area under the receiver operating characteristic curve score of 0.76.

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