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AGU: Geophysical Research Letters

 

Index Terms

  • Atmospheric Composition and Structure: Volcanic effects
  • Geodesy and Gravity: Atmosphere monitoring with geodetic techniques
  • Ionosphere: Ionospheric disturbances
  • Volcanology: Explosive volcanism
  • Volcanology: Instruments and techniques

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 33, L14303, 4 PP., 2006
doi:10.1029/2006GL026249

Explosion energy of the 2004 eruption of the Asama Volcano, central Japan, inferred from ionospheric disturbances

Kosuke Heki

Department of Natural History Science, Hokkaido University, Sapporo, Japan

The Japanese dense array of Global Positioning System recorded ionospheric disturbances as changes in Total Electron Content ∼12 minutes after the September 1 2004 eruption of the Asama Volcano, Central Japan. The disturbance had a period of one and a quarter minutes and propagated as fast as ∼1.1 km/s, suggesting its origin as the acoustic wave generated by the explosion. By comparing the disturbance amplitudes with those by a surface mine blast with a known energy, the overall Asama explosion energy is inferred to be about 2 × 1014 J.

Received 8 March 2006; accepted 7 June 2006; published 19 July 2006.

Citation: Heki, K. (2006), Explosion energy of the 2004 eruption of the Asama Volcano, central Japan, inferred from ionospheric disturbances, Geophys. Res. Lett., 33, L14303, doi:10.1029/2006GL026249.

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