Monotonic infrasound and Helmholtz resonance at Volcan Villarrica (Chile)

A. Goto, J. B. Johnson

研究成果: Article査読

43 被引用数 (Scopus)


Monotonic infrasound with stable peaked frequency of 0.77 Hz was recorded at Volcan Villarrica in January 2010. Similar monotonic infrasound had been previously reported at Villarrica (e.g., Ripepe et al. [2010]). Using joint infrasound and visual observations from a suspended camera we demonstrate that the likely source of infrasound is Helmholtz resonance produced from a cavity with volume 105 m3 that separates the active convecting lava lake from an overhanging spatter roof. Spatter roof dimension (65 m diameter) and vent diameter (10 m) in the roof are constrained from video observations. Assuming a cylindrical cavity we infer a cavity height of 31 m that is corroborated by video records of spatter drips. The drips take as long as 2.2 s to fall from the roof into the lake, corresponding to a height of more than 24 m, which is in good agreement with the observed resonance frequency.

ジャーナルGeophysical Research Letters
出版ステータスPublished - 2011 3月 1

ASJC Scopus subject areas

  • 地球物理学
  • 地球惑星科学(全般)


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