major volcanic eruption; large-scale eruption
Refers to a very large, often explosive volcanic eruption. Used in geology, news, and disaster contexts.
A major eruption of Mt. Fuji is feared.
Major eruptions have occurred many times in this region in the past.
Compound of 大 (dai, 'big, great') + 噴火 (funka, 'eruption'). The exact historical derivation is straightforward.