Kīlauea

Lore & Background

Kīlauea is the second-youngest product of the Hawaiian hotspot and the current eruptive center of the Hawaiian–Emperor seamount chain. Because it lacks topographic prominence and its activities historically coincided with those of Mauna Loa, Kīlauea was once thought to be a satellite of its much larger neighbor. It has a large, fairly recently formed caldera at its summit and two active rift zones, one extending 125 km east and the other 35 km west. An active fault of unknown depth moves vertically an average of 2 to 20 mm per year.

Between 2008 and 2018, Halemaʻumaʻu, a pit crater within Kīlauea's summit caldera, hosted an active lava lake. Kīlauea erupted nearly continuously from vents on its eastern rift zone between January 1983 and April 2018, causing major property damage, including the destruction in 1990 of the towns of Kalapana and Kaimū along with the community's renowned black sand beach. Beginning in May 2018, activity shifted further downrift to the lower Puna district, destroying Hawaii's largest natural freshwater lake, covering substantial portions of Leilani Estates and Lanipuna Gardens, and destroying the communities of Kapoho, Vacationland Hawaii, and most of the Kapoho Beach Lots. The County of Hawaii reported that 716 dwellings were destroyed. The eruption ended in September 2018. Since 2020, several eruptions have occurred within the enlarged Halemaʻumaʻu crater from the 2018 collapse events as well as along the volcano's southwest and east rift zones.

Reader's Guide

Kīlauea's activity has a major impact on its mountainside ecology, where plant growth is often interrupted by fresh tephra and drifting volcanic sulfur dioxide, producing acid rains particularly in a barren area south of its southwestern rift zone known as the Kaʻū Desert. Nonetheless, wildlife flourishes left undisturbed elsewhere on the volcano and is highly endemic thanks to Kīlauea's (and the island of Hawaiʻi's) isolation from the nearest continental landmass. Historically, the island's five volcanoes were considered sacred by the Hawaiian people, and in Hawaiian mythology Halemaʻumaʻu served as the body and home of Pele, goddess of fire, lightning, wind, and volcanoes.

English missionary William Ellis gave the first modern account of Kīlauea and spent two weeks exploring the volcano. Since its foundation by Thomas Jaggar in 1912, the Hawaiian Volcano Observatory, for many years located on the rim of Kīlauea's summit caldera (Kaluapele), has served as the principal investigative and scientific body on the volcano and the island. In 1916, a bill forming Hawaii Volcanoes National Park was signed into law by President Woodrow Wilson. The park is a World Heritage Site and a major tourist destination, attracting roughly 2.6 million visitors annually. Kīlauea's eruption from January 3, 1983, to 2018 was by far its longest-duration period of activity in modern times, as well as one of the longest-duration eruptions documented on Earth; as of January 2011, the eruption had produced 3.5 km³ of lava and resurfaced 123.2 km² of land.

Did You Know?

• Kīlauea is a Hawaiian word that means 'spewing' or 'much spreading', referring to its frequent outpouring of lava.
• The 1790 eruption of Kīlauea killed more than 400 people, making it the deadliest volcanic eruption in what became the United States.
• The ʻAilāʻau eruption of 1410 lasted about 60 years, ending in 1470 with an estimated volume of 4–6 km³ of lava.
• Kīlauea's most recent eruption began in December 2024, with episodic lava fountains and flows continuing into 2026.

Geological Origins & Structure

Kīlauea stands as one of the youngest expressions of the Hawaiian hotspot, a deep mantle feature that has dragged the Pacific tectonic plate across a 6,000-kilometer path over roughly 70 million years, producing the entire Hawaiian–Emperor seamount chain. Situated along the southeastern coast of Hawaiʻi Island, this shield volcano is estimated to be between 210,000 and 280,000 years old, with its cone rising above sea level approximately 100,000 years ago. It is the second-youngest volcano in the chain and serves as the chain's current eruptive center. The volcano's summit hosts a large, relatively recently formed caldera, while two active rift zones extend outward—one stretching 125 kilometers to the east and the other 35 kilometers to the west. Beneath the surface, an active fault of unknown depth shifts vertically at an average rate of 2 to 20 millimeters per year, a slow but persistent reminder that the edifice is still adjusting to the molten forces that built it.

The 2018 Eruption & Its Aftermath

In May 2018, Kīlauea's eruptive focus shifted dramatically away from its long-standing eastern rift zone vents and down into the lower Puna district. Over the following months, roughly two dozen new vents opened, hurling fountains of lava that fed rivers of molten rock into the Pacific at three separate points. The destruction was staggering: the eruption obliterated Hawaiʻi's largest natural freshwater lake, buried the Leilani Estates and Lanipuna Gardens subdivisions, and wiped out the communities of Kapoho, Vacationland Hawaiʻi, and most of the Kapoho Beach Lots. The County of Hawaiʻi tallied 716 destroyed dwellings. Simultaneously, the lava lake that had filled Halemaʻumaʻu crater for a decade drained away, triggering a cascade of explosive collapse events at the summit. At least one of these blasts lofted ash nearly 30,000 feet into the atmosphere, forcing a months-long closure of the Kīlauea portion of Hawaiʻi Volcanoes National Park. The eruption finally subsided in September 2018, but the enlarged crater and reactivated rift zones have produced further eruptions since 2020, with the most recent episode beginning in December 2024 and continuing into 2026.

A Record of Eruptions

Few volcanoes on Earth can match Kīlauea's relentless eruptive history. Since the islands were first settled, it has been the most active of the five volcanoes that compose Hawaiʻi Island and ranks among the most active on the planet. The geological and oral record stretches back millennia: a major eruption around 1410, known as the ʻAilāʻau event, lasted roughly sixty years and produced an estimated four to six cubic kilometers of lava, making it the first eruption referenced in Native Hawaiian oral history. A far more violent episode in 1790 claimed over 400 lives, the deadliest volcanic disaster in what is now the United States. Western written records began in 1778, and the first documented eruption came in 1823, followed by repeated prolonged, effusive events at the summit and eastern rift zone. The eruption that began on January 3, 1983, and continued until 2018 stands as the longest sustained activity in the volcano's modern record and one of the longest documented on Earth. By January 2011, it had extruded 3.5 cubic kilometers of lava and resurfaced more than 123 square kilometers of land. In 1990, flows destroyed the coastal towns of Kalapana and Kaimū and their renowned black sand beach.

Cultural & Scientific Legacy

The Hawaiian name Kīlauea translates roughly to "spewing" or "much spreading," a fitting descriptor for a volcano whose surface is 90 percent covered by lavas younger than a thousand years. In Hawaiian mythology, the summit pit crater Halemaʻumaʻu is the body and dwelling place of Pele, the goddess of fire, lightning, wind, and volcanoes, and all five volcanoes on the island were regarded as sacred. The first modern Western account came from English missionary William Ellis, who spent two weeks exploring the volcano. In 1912, Thomas Jaggar founded the Hawaiian Volcano Observatory on the rim of the summit caldera at Kaluapele, establishing the principal scientific body dedicated to studying the volcano and the island. Four years later, President Woodrow Wilson signed the bill creating Hawaiʻi Volcanoes National Park, now a UNESCO World Heritage Site that draws roughly 2.6 million visitors each year. The volcano also shapes its surrounding ecology: fresh tephra and drifting sulfur dioxide interrupt plant growth and produce acid rains, particularly in the barren Kaʻū Desert south of the southwestern rift zone, while the island's isolation has fostered highly endemic wildlife in areas left undisturbed.