A prominent structure on Kīlauea 's southern flank is the Hilina fault system , a highly active fault slipping vertically an average of per year along the system . Its physiographic province is deep , but it is unknown whether it is a shallow listric fault or if it penetrates to the very base of the volcano . In connection with the 2018 lower Puna eruption the Hawaiian Volcano Observatory published some facts leading to the conclusion , that a catastrophic collapse would be incredibly remote . A number of cinder cones , satellite shields , lava tubes , and other eruptive structures also dot the volcano , evidence of its recent activity . Kīlauea has some interactions with Mauna Loa , its larger neighbor and only other recently active volcano on the island ; interspersed lava flows and ash deposits belonging to its neighbor have been found on its flanks , and some of Mauna Loa 's flows are , in turn , blanketed in Kīlauea tephra . In particular , the saddle between the two volcanoes is currently depressed , and is likely to fill over in the future
2018 lower Puna eruption
2018 lower Puna eruption
Kīlauea