spatter

Japanese: spatter
spatter

...If they are fragments of rocks from the same volcanic body but not directly related to the magma of the eruption, they are called accessory material, and rock fragments unrelated to the magma, such as bedrock, are called heterogeneous accidental material. Pyroclastic materials with special external shapes or internal structures are called volcanic bombs, spatters (spray-like lumps of lava), dribblets (flat spatters, also called lava mochi), pumice, scoria, etc. In large-scale eruptions, it is not uncommon for more than 1 billion tons of volcanic ejecta to be released from the crater in a short period of time.

*Some terminology explanations that mention "spatter" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…噴火のマグマに直接関係ないが同じ火山体の岩石の砕片である場合は類質accessory物質,そして基盤岩などマグマと無関係な岩片は異質accidental物質と呼ばれる。火山砕屑物のなかで特殊な外形や内部構造をもつものは火山弾,スパターspatter(溶岩のしぶき状の塊),ドリブレットdriblet(溶岩餅ともいい,スパターの扁平なもの),軽石,スコリアなどと呼ばれる。 大規模な噴火では10億t以上の火山放出物が短時間内に火口から放出されることがまれでない。…

※「spatter」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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