Kīlauea: a deep dive into Hawaii's most active volcano
Kīlauea is the textbook hot-spot volcano. It sits on the southeast flank of Mauna Loa on Hawaii's Big Island, its lava plumbing fed directly by a plume of mantle rising from depths most other volcanoes never sample. It has been more or less continuously active since at least 1983, and geological evidence suggests something like that has been true for centuries.
A shield, not a cone
Kīlauea is a shield volcano. Instead of a steep cone built by violent explosions, it is a broad, gently sloping dome built by countless thin, fluid lava flows. The summit caldera is a sunken oval roughly four kilometres across, with the Halemaʻumaʻu pit crater at its heart — the fire pit Pele is said to call home.
The 1983–2018 Puʻu ʻŌʻō eruption
For thirty-five years, lava poured almost continuously from the Puʻu ʻŌʻō vent on the East Rift Zone. The flows built new black-sand beaches, swallowed villages like Kalapana and Kaimū, and added more than 400 hectares of new land to the island. Visitors hiked over warm, glassy ropes of pāhoehoe to watch lava enter the sea.
The 2018 lower Puna eruption
In May 2018 the system shifted. Fissures opened in residential neighbourhoods on the lower East Rift Zone, and a high-flux ʻaʻā lava flow tore through Leilani Estates and into the ocean at Kapoho Bay, destroying more than 700 homes. The summit caldera simultaneously collapsed in a series of magnitude-5 explosions, deepening Halemaʻumaʻu by hundreds of metres.
The current summit phase
Since 2020, episodic lava lakes have refilled and drained Halemaʻumaʻu on a roughly monthly rhythm. New crusts sink and reform, gas plumes brighten the night, and the National Park has reopened views from overlook trails. Each episode is broadcast live on USGS webcams.
Visiting Hawaiʻi Volcanoes National Park
The park covers Kīlauea's summit and a long stretch of its rift zones. Crater Rim Drive and the Chain of Craters Road let visitors trace the caldera and descend to the sea on a road that lava has repeatedly overrun. The Thurston Lava Tube and Kīlauea Iki Trail are unmissable.
Culture and Pele
Kīlauea is a sacred place in Native Hawaiian cosmology. Pele, goddess of fire and volcanoes, is said to live in Halemaʻumaʻu. Offerings are common at the rim, and the park's interpretation has shifted in recent years to put Hawaiian knowledge alongside the geology.
Monitoring and forecasting
The USGS Hawaiian Volcano Observatory, perched on the caldera rim, operates one of the world's most instrumented volcanoes. Tiltmeters, GPS, seismometers and gas spectrometers feed a continuous data stream. The 2018 collapse and the current summit episodes have been exceptionally well documented.
Why Kīlauea matters
Kīlauea is where the modern understanding of basaltic shield volcanism was largely built. It is one of the few active volcanoes in the world a non-specialist can reliably visit safely. And it is a living reminder that Hawaii is not finished growing.
On the map
Open the map and find Kīlauea on the southeast flank of the Big Island. Mauna Loa is the larger shield just to the north, and the new Lōʻihi seamount is rising offshore to the southeast.