ロイ島のロキ・パテラで多段階の火山の再現

K de Kleer¹, M Skrutskie², J Leisenring³

¹Department of Astronomy, University of California at Berkeley, Berkeley, California, USA.

Nature

|May 12, 2017

まとめ

木星の月イオのロキ・パテラは 2つの波を含む多段階のプロセスによって再現されます. この火山活動により,溶岩ガスの含有量と地殻の密度が均一でないことが明らかになった.

科学分野:

惑星科学
火山学
地理学

背景:

木星の月であるイオのロキ・パテラは太陽系で最も強力な火山です
以前の観測では,1~3年ごとに表層に浮き上がり時計時計の方向に反して進んでいると示唆されたが,正確な過程を決定するには十分な解像度が欠けていた.

研究の目的:

ローキ・パテラ全土の熱放出と溶岩の冷却年齢をマッピングする
ロキ・パテラの再現に物理的過程を確立する

主な方法:

ロキ・パテラからの熱放出の地上インターフェロメトリック画像を用いた.
2015年3月8日,イオのヨーロッパ隠蔽で得られたデータ.
パテラ床から約2キロのサンプルを採取しました

主要な成果:

パテラ全体の温度と溶岩の冷却年齢マップを生成しました.
2つの異なる波が島の中心部に広がり収束する過程を特定しました
溶岩ガス含量および/または地殻の大量密度の非均一性を示す波速および開始時間における観測された変動.

結論:

ロキ・パテラの再生は複雑な多段階のプロセスであり単純な片道的な流れではありません
観測された波動力学に基づいたロキ・パテラの地下特性の推論された異質性.
この研究は,この極端な木星の環境を形作る火山の過程について,前例のない詳細を提供します.

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