Assertion: volcano's eruption | /r/HasProperty | concentrated at o'o vent
Facets:
value: mainly
type: DEGREE
Source sentences:
text: At present, Kilauea volcano is still having one of the most long-lived eruptions known on earth, which started in 1983 on the eastern rift zone and has mainly been concentrated at the Pu'u 'O'o vent.