文章基本信息

标题：Continuous thermal monitoring of the 2008 eruptions at Showa crater of Sakurajima volcano, Japan
本地全文：下载
作者：Akihiko Yokoo
期刊名称：Earth, Planets and Space
电子版ISSN：1880-5981
出版年度：2010
卷号：61
期号：12
页码：1345-1350
DOI：10.1186/BF03352987
出版社：Springer Verlag
摘要：An infrared thermal monitoring system installed 3.5 km from the Showa crater of Sakurajima volcano, Japan, enabled the capture of continuous thermal waveform data at 1 Hz during two recent episodes of eruptive activity. The eruptions were characterized by a sudden increase in volcanic cloud temperature in the first 2–5 s, followed by gradual cooling over a few minutes. The maximum cloud temperature varied widely between individual events with a range of more than 180◦C. A positive relation between the maximum temperature and the exit velocity of the cloud has also been established. At higher temperatures and faster exit velocities of the volcanic cloud, the eruptions tend to be accompanied by pyroclastic density currents. However, no strong correlation was observed in a 6-month period of 2008 between temporal changes in surface manifestation of eruptive activity and the change of cloud temperatures. Identification of factors that control such observed apparent temperatures of volcanic cloud would lead to a better understanding of the thermodynamics of the eruption itself.
关键词：Infrared thermal observation; Sakurajima volcano; Showa crater; the 2008 eruptions; radiative thermal energy