The last eruption occurred during Holocene time .
The last eruption produced a dacitic lava flow ( 2.5 cubic kilometres ( 1 cu mi ) in volume ) that extends for 30 kilometres ( 19 mi ) .
The last eruption occurred during Holocene time , and produced a dacitic lava flow ( 2.5 cubic kilometres ( 1 cu mi ) in volume ) that extends for 30 kilometres ( 19 mi ) .