1982年3月28日から4月7日までメキシコのチアパス州エル・チコン火山の噴火
まとめ
1982年のエル・チホン火山の噴火では,0.3立方キロメートルのアンデシート型火力弾性物質が放出されました. 初期の噴火は結晶に富んだテフラを産み出し,これは後の岩石型火力弾性物質の放出とは異なっていた.
科学分野:
- 火山学 火山学とは
- 地質化学 地質化学
- 地球科学 地球科学 地球科学
背景:
- 歴史的に眠っていたエル・チホン火山は,1982年3月28日から大規模な噴火を経験した.
- 火山の活動には,10日間の間に3つの大きなテフラ噴火が含まれていました.
研究 の 目的:
- 1982年のエル・チホン噴火で放出されたテフラの特性を分析するために.
- 異なる噴火段階からのテフラの化学および物質組成を比較する.
主な方法:
- 1982年の噴火シーケンスから採取したテフラサンプルの分析.
- シリカとアルカリ含有量を含むピロクラスティック材料の組成の特徴.
主要な成果:
- 約0.3立方キロメートルのアンデシート型火力弾性物質が噴火した.
- 最初の噴火は,より高いシリカとアルカリ含有量を持つ結晶に富んだテフラを生成しました.
- その後の噴火 (第2回と第3回) は,初期段階とは異なる石灰岩型火弾性物質を放出しました.
- 初期のテフラは主に未成年であったが,後の噴火では石岩と未成年の両方の分子が含まれていた.
結論:
- 1982年のエル・チホン噴火は,テフラ組成の異なる段階を示した.
- テフラの変動は,イベント中にマグマ源または噴火ダイナミクスの変化を示唆しています.
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