Kilauea

Geography & Climate

Kilauea is located in United States, within the Hawaiian-Emperor Hotspot Volcano Group of the broader Eastern Pacific Volcanic Regions. Situated at 19.42° N, 155.29° W in the Northern Hemisphere, the volcano lies within a tropical climate zone. With a summit elevation of 1,222 meters above sea level, Kilauea is a moderately sized peak that remains accessible to hikers and researchers for much of the year. The volcanic landform is characterized as a shield, which describes the physical shape and structure of the volcanic edifice as observed from the surface.

Geological Context

Kilauea is an intraplate volcano, meaning it formed away from any plate boundary. These volcanoes are often powered by hotspots — plumes of abnormally hot mantle material rising from deep within the Earth. Hotspot volcanoes like Kilauea tend to produce effusive eruptions with lava flows that can be relatively predictable, giving nearby communities in United States more time to prepare. However, they can also produce explosive phases, particularly when magma interacts with groundwater. The dominant rock type is basalt / picro-basalt, a dark, fine-grained volcanic rock that forms from rapidly cooling, low-viscosity lava. Basaltic eruptions tend to be less explosive and produce fluid lava flows that can travel long distances. While less immediately dangerous than explosive eruptions, basaltic lava flows can destroy structures and infrastructure in their path, and volcanic gases released during these eruptions can affect air quality over a wide area.

Eruption History Summary

Kilauea has 75 recorded eruptions in the geological database, spanning from 4650 BCE to 2024 CE. The most powerful recorded event was a cataclysmic eruption with ash columns reaching the stratosphere in 1790 CE, reaching VEI 4 on the Volcanic Explosivity Index. Notable eruptions include 1983 CE (VEI 3), 1790 CE (VEI 4). With an average interval of roughly 89 years between eruptions over a span of 6,674 years, this is one of the more frequently active volcanoes in the database. This persistent activity suggests a robust and well-supplied magma system beneath the volcano. With eruptive activity as recently as 2024 CE, Kilauea remains an actively monitored volcano.

Significance

With a maximum recorded VEI of 4, Kilauea has demonstrated the capacity for significant explosive eruptions that can impact regional aviation, agriculture, and communities tens of kilometers from the summit. VEI 4 eruptions produce ash columns reaching 15-25 kilometers into the atmosphere. Its 75 recorded eruptions make it one of the most prolific volcanoes in the entire global volcanic record, reflecting an exceptionally persistent magma supply system that has sustained near-continuous eruptive activity over millennia. Given its recent activity, Kilauea is closely monitored by geological survey organizations to provide early warning of future unrest.

GVP Reference Summary

Kilauea overlaps the E flank of the massive Mauna Loa shield volcano in the island of Hawaii. Eruptions are prominent in Polynesian legends; written documentation since 1820 records frequent summit and flank lava flow eruptions interspersed with periods of long-term lava lake activity at Halemaumau crater in the summit caldera until 1924. The 3 x 5 km caldera was formed in several stages about 1,500 years ago and during the 18th century; eruptions have also originated from the lengthy East and Southwest rift zones, which extend to the ocean in both directions. About 90% of the surface of the basaltic shield volcano is formed of lava flows less than about 1,100 years old; 70% of the surface is younger than 600 years. The long-term eruption from the East rift zone between 1983 and 2018 produced lava flows covering more than 100 km2, destroyed hundreds of houses, and added new coastline.

— Smithsonian Institution, Global Volcanism Program