2010年9月1日
Magnetotelluric pulses generated by volcanic lightning at Sakurajima volcano, Japan
Geophysical Research Letters
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- 巻
- 37
- 号
- 17
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1029/2010GL044208
- 出版者・発行元
- American Geophysical Union
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. © 2010 by the American Geophysical Union.
- リンク情報
- ID情報
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- DOI : 10.1029/2010GL044208
- ISSN : 0094-8276
- SCOPUS ID : 77956444325