Muographic observation of density variations in the vicinity of minami-dake crater of sakurajima volcano

László Oláh, Hiroyuki K.M. Tanaka, G. Hamar, Dezső Varga

Research output: Contribution to journalArticle

Abstract

Muography is an innovative imaging technique used for inspecting and monitoring density-length variations of large-sized natural or human-made objects based on the measurement of the absorption rate of cosmic-ray muons. The first large-sized, high-resolution muography observatory based on Multi-Wire Proportional Chamber (MWPC) technology is being developed to monitor the mass density variations in the vicinity of Minami-dake crater of Sakurajima volcano. We found that the track rates provided by five ongoing tracking systems with a total surface area of 4 m2 are stable within ±3% from the backward direction, which demonstrates that the MWPC-based Muographic Observation System (MMOS) is applicable for the detection of average density variations above 2%, which is well below the practical limit of 5%. We quantified the time resolution of the designed muography observatory by modeling the muon flux across the volcano; the average density-length variation of 5 (10)% is expected to be detected within 5–20 (2–8) days at a 1σ (68%) confidence level (CL) with an MMOS orientation of 10.86 above the horizon. An automated analysis framework was developed as a data base for raw data reconstruction, analysis, and preparation, and which is accessible via web-server. We observed a more than 2σ CL decrease in average density across the West side of Crater A during the ongoing data collection period. The observed density decrease suggests that the amount of material has decreased inside Crater A due to the consecutive eruptions of Minami-dake during the data collection period from November 30, 2018 to January 11, 2019.

Original languageEnglish
Pages (from-to)701-712
Number of pages12
JournalJournal of Disaster Research
Volume14
Issue number5
DOIs
Publication statusPublished - Aug 1 2019

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Volcanoes
Observatories
Wire
Cosmic rays
Servers
Fluxes
Imaging techniques
Monitoring

Keywords

  • Density imaging
  • Muography
  • MWPC
  • Tracking detectors
  • Volcanoes

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Engineering (miscellaneous)

Cite this

Muographic observation of density variations in the vicinity of minami-dake crater of sakurajima volcano. / Oláh, László; Tanaka, Hiroyuki K.M.; Hamar, G.; Varga, Dezső.

In: Journal of Disaster Research, Vol. 14, No. 5, 01.08.2019, p. 701-712.

Research output: Contribution to journalArticle

Oláh, László ; Tanaka, Hiroyuki K.M. ; Hamar, G. ; Varga, Dezső. / Muographic observation of density variations in the vicinity of minami-dake crater of sakurajima volcano. In: Journal of Disaster Research. 2019 ; Vol. 14, No. 5. pp. 701-712.
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