Kīlauea Notes 1971, 1974, 1982 Halemaumau Crater Eruptions
Kīlauea summit eruptions have not always stayed inside halemaumau crater. A history note tied to Pele says the crater sits within the larger Kaluapele caldera at Kīlauea’s summit, but earlier eruptions broke that pattern and sent lava outside the rim.
The record now matters because the ongoing lava fountaining reached Episode 45 on April 23, and recent episodes that began Dec. 23, 2024 continue to generate intermittent lava flows across the same area. For readers watching Kīlauea’s summit, the question is not whether the crater has contained most recent activity, but how often the summit has reached beyond it before.
Halemaumau Crater and Kaluapele
Pele is identified in the source as associated with Halemaʻumaʻu Crater, described there as home of ancient Hawaiian lava and volcano goddess Pele, and as sitting within the larger, steep-walled Kaluapele caldera. The same background says summit eruptions in the past several decades have been confined to Halemaʻumaʻu, a sharp contrast with the older record.
That contrast begins with written documentation from 1832 and 1868, when summit eruptions occurred to the east of Kaluapele. In 1959, the episodic lava fountaining eruption at Kīlauea Iki formed Puʻupuaʻi, also east of the Kaluapele boundary.
1971 and 1974 near Keanakākoʻi
The August 14, 1971 eruption near Keanakākoʻi lasted about 10 hours. Its lava flow cascaded over the caldera rim and flowed to below Volcano House, showing that summit activity could reach well outside the area most people associate with Kīlauea.
Three years later, the July 19-22, 1974 eruption sent lava flows over the caldera rim before they solidified below Volcano House. One lobe cascaded into the bottom of Keanakākoʻi Crater and continued to flow farther south and east before the eruption ceased. The fissure systems that fed the 1971 and 1974 eruptions spanned hundreds of yards.
September 1982 fissures
The September 25, 1982 eruption lasted about 15 hours and opened a fissure system in the south caldera region about a mile from the Keanakākoʻi overlook. Its lava flow reached to within 700 yards of the overlook, placing the eruption in the same part of the summit area that the 1971 and 1974 events had already marked.
Portions of both the 1971 and 1974 fissures were lowered along with the caldera floor during the 2018 collapse. That change tied those older eruption sites to a newer summit layout, even as the lava lake that had formed in 2008 drained and the water lake that formed after the collapse was destroyed during the December 2020 eruption.
Dec. 23, 2024 and Episode 45
The latest fountaining began Dec. 23, 2024 and has continued to generate lava flows that intermittently cover the area. By April 23, the eruption had reached Episode 45, leaving Kīlauea’s summit with both a recent eruption sequence and a record that shows the summit has broken beyond Halemaʻumaʻu before.
For anyone tracking Kīlauea, the practical takeaway is direct: Halemaʻumaʻu has dominated recent summit activity, but the documented eruptions in 1832, 1868, 1959, 1971, 1974 and 1982 show that the summit has repeatedly shifted outside the crater when conditions allowed.
