"summit collapse events during the 2018 eruption of K\u012Blauea" . "Halema\u02BBuma\u02BBu" . "Halema'uma'u" . . . . . . . "Halema\u02BBuma\u02BBu Crater" . "Halema'uma'u Shield" . . . "longest-observed" . . "Halema\u02BBuma\u02BBu" .