noun
volcaniclastic material; pyroclastic material
Geological term for fragmented material ejected by volcanoes, including ash, lapilli, bombs, and blocks. Often used in academic and technical contexts.
火山砕屑物は噴火の規模を知る手がかりになる。
Volcaniclastic material provides clues to the scale of an eruption.
この地層に
This stratum contains a large amount of pyroclastic material.