日本地球惑星科学連合2018年大会

講演情報

[JJ] ポスター発表

セッション記号 O (パブリック) » パブリック

[O-05] キッチン地球科学 -手を動かして頭脳を刺激する実験-

2018年5月20日(日) 10:45 〜 12:15 ポスター会場 (幕張メッセ国際展示場 7ホール)

コンビーナ:熊谷 一郎(明星大学理工学部)、久利 美和(東北大学災害科学国際研究所)、栗田 敬

[O05-P03] 火山噴火における「ペレーの涙」はどのようにしてできるのか?

山田 美幸1村井 祐一2、*熊谷 一郎2,3 (1.日本大学、2.北海道大学、3.明星大学)

キーワード:火山、実験、ペレーの涙

“Pele’s tears” and “Pele’s hairs” are volcanic glass products, which are formed by the breakup, stretching, and cooling of molten magma during their eruption. Their formation process is complicated, and their morphology depends on many parameters such as rheological properties of the volcanic glass, cooling rate, ejection speed, wind velocity, and so on. While we reported the analog experiment on the “Pele’s hair” in the previous presentation, this year we will focus on the formation process of the “Pele’s tear”. Through the simple analogue experiments on the cotton candy formation, we attempted to generate the “Pele’s tear” like morphology and considered the formation process. The experiment was conducted in the cotton candy machine we reported last year. The melted sugar (the analogue of molten magma) was formed after heating the rotating disk and ejected through the outlets at its periphery. The flow behavior of the melted sugar jet was captured by a high-speed video camera, which helped us to understand the formation process. In this presentation, we’ll consider how the difference in morphology between “tear” and “hair” occurs.