Japanese volcanoes visualized with muography.

Area of Science:

• Geophysics
• Volcanology
• Particle Physics

Background:

• Cosmic-ray muons are secondary particles generated from primary cosmic ray interactions with the atmosphere.
• Muography utilizes the absorption and scattering of these muons to image subsurface structures.
• Understanding volcanic interiors is crucial for predicting eruptions and mitigating hazards.

Purpose of the Study:

• To review the application of muography for imaging the shallow interior of volcanoes.
• To assess the potential of muography as an alternative volcano observation technique.
• To explore how muography can contribute to understanding volcanic dynamics.

Main Methods:

• High-energy muons generated from cosmic rays are used as natural probes.
• Muon detectors are deployed to record the passage of muons through the volcano.
• Analysis of muon flux and scattering patterns reveals density variations within the volcano.

Main Results:

• Muography successfully mapped density distributions in the shallow interiors of three Japanese volcanoes.
• The technique was applied to study lava dome formation, vulcanian explosions, and magma convection.
• Observational data demonstrated muography's capability in characterizing different volcanic processes.

Conclusions:

• Muography is a viable and alternative technique for volcano observation.
• This method provides novel insights into volcanic eruption mechanisms.
• Further application of muography can enhance our understanding of subsurface volcanic structures and dynamics.