Magnetotelluric pulses generated by volcanic lightning at Sakurajima volcano, Japan

Koki Aizawa, Akihiko Yokoo, Wataru Kanda, Yasuo Ogawa, Masato Iguchi

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18 Citations (Scopus)

Abstract

Continuous magnetotelluric (MT) measurements were conducted at Sakurajima volcano, Japan, revealing syn-eruption electric pulses (and sometimes accompanying geomagnetic pulses). Movies of the eruptions, recorded with timing provided by a GPS clock, show a large number of volcanic lightning flashes. Some MT pulses occurred simultaneously with lightning flashes. Pulses were observed more than 10 seconds after the onset of the eruption, and tend to occur during eruptions that emit volcanic ash to high altitudes. Pulses were more common during mild eruptions rather than during Vulcanian eruptions. The observations suggest that the dominant mechanism of volcanic lighting is similar to that of lightning in thunderstorms, in that it requires the collision of particles and subsequent separation of positive and negative charge.

Original languageEnglish
Article numberL17301
JournalGeophysical Research Letters
Volume37
Issue number17
DOIs
Publication statusPublished - Sep 1 2010
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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