Assertion: volcano's summit | /r/HasProperty | intense surtseyan activity
Facets:
value: with explosions
type: OTHER
Source sentences:
text: The summit of the volcano was at only 2-5 m below the sea surface and there was intense Surtseyan activity with explosions producing rooster-tail jets of ash, steam, blocks and incandescent lava blocks that were thrown up to 70 m height.