Kīlauea stands as one of the most reliably active volcanoes on the planet, offering an ongoing laboratory for the study of Hawaiian-style basaltic eruptions. Located on the southeastern flank of the island of Hawaiʻi, this shield volcano has built the southeasternmost portion of the island through countless flows over hundreds of thousands of years. Unlike many explosive stratovolcanoes, Kīlauea typically produces relatively gentle effusive eruptions, yet its history is punctuated by moments of dramatic change and significant hazard. Understanding this eruption history requires looking at both the long-term patterns of activity and the specific events that have shaped the local landscape and impacted communities.
Long-Term Behavior and Geological Context
To understand modern eruptions, one must first recognize that Kīlauea is a young volcano relative to the other major edifices on Hawaiʻi Island. It emerged from the sea less than half a million years ago, initially forming the submerged rift zones that now extend kilometers offshore. The volcano is driven by the steady supply of magma from a deep mantle plume, which rises through the crust and feeds a reservoir located several kilometers below the summit caldera. This reservoir acts as a staging area, where molten rock accumulates before being fed into either the summit or one of the two prominent rift zones—the East Rift Zone or the Southwest Rift Zone—that dictate the pathways of future lava flows.
The Era of Halemaʻumaʻu and Summit Activity
The summit of Kīlauea has been a dynamic centerpiece of its eruption history, particularly since the formation of the Halemaʻumaʻu crater within the larger summit caldera. For much of the 20th century, the crater held a relatively stable lava lake that would occasionally rise and fall. However, the period from 2008 to 2018 marked a profound shift. In 2008, a new vent opened in Halemaʻumaʻu, initiating a continuous episode of lava lake activity that generated a persistent plume of volcanic gas and ash. This phase was characterized by fluctuating lava levels, occasional overflows onto the crater floor, and the gradual deepening of the crater itself through collapse events.
2018 Caldera Collapse and Rift Zone Eruption
The year 2018 stands as a watershed moment in the recent eruption history of Kīlauea. Following a magnitude 6.9 earthquake in April, the lava column within Halemaʻumaʻu plummeted, signaling the onset of a dramatic summit collapse. Over the following weeks, the floor of the caldera subsided hundreds of meters, fragmenting rock and triggering numerous additional earthquakes. Simultaneously, activity migrated down the East Rift Zone, where fissures opened in the Leilani Estates subdivision. This rift zone eruption produced prolific lava flows that covered more than 35 square kilometers, destroyed hundreds of homes, and dramatically altered the coastline, adding new land where lava entered the ocean.
The Post-2018 Interlude and 2021 Resurgence
In the years immediately following the 2018 events, the summit of Kīlauea experienced a period of relative quiet. The lava lake drained entirely, and the caldera floor stabilized. However, this lull was temporary. In December 2020, the volcano reawakened with a vigorous eruption within Halemaʻumaʻu. This event marked the beginning of a new phase of lava lake activity, which filled the crater floor to levels not seen in decades. The eruption continued into 2021, demonstrating the volcano’s capacity to rebuild a lava lake relatively quickly after a catastrophic draining event. This period provided scientists with a valuable opportunity to study the replenishment cycles of the summit reservoir in real time.
The 2023-2024 Summit and Summit to Rift Transition
More perspective on Mount kilauea eruption history can make the topic easier to follow by connecting earlier points with a few simple takeaways.
