Assertion: volcano's rift zone | /r/HasAspect | experineced eruptions
Facets:
Source sentences:
text: Although the longevity of the current eruption is unique in the brief era of scientific observation at Kilauea, occasional long-lived rift zone eruptions during each 1000 years or so have probably been significant in building up the volcano [For instance, Delaney, 1993 (full reference is given below) estimated that the east rift zone may have experineced eruptions that lasted for most of a century].