Kīlauea Iki

Kīlauea Iki
Name	Kīlauea Iki
Photo caption	View into the crater
Elevation	1,244 m
Location	Hawaiʻi
Range	Hawaiian Islands
Coordinates	19°25′N 155°17′W
Type	shield volcano
Last eruption	1959

Kīlauea Iki is a pit crater located within the Kīlauea caldera on the Hawaiʻi Volcanoes National Park summit complex on the island of Hawaiʻi. The crater formed during summit eruptive episodes and is notable for its 1959 eruption that produced a lava lake and extensive lava fountains, attracting international attention from volcanologists, emergency managers, and media outlets such as the National Park Service, United States Geological Survey, and news organizations. Kīlauea Iki remains a focus of field studies by institutions including Smithsonian Institution, University of Hawaiʻi at Mānoa, and California Institute of Technology.

Geography and geology

Kīlauea Iki occupies a nested position inside the larger Kīlauea caldera near landmarks like Mokuʻāweoweo and the Hilina Pali, and sits along volcanic rift zones associated with Hawaiian hotspot, Pacific Plate, and mantle plume processes. The crater morphology exhibits steep walls, a flat floor, and remnants of pahoehoe and aʻa surfaces similar to flows mapped by the United States Geological Survey and compared with features at Mauna Loa and Mauna Kea. Its geology records interactions among olivine, pyroxene, and plagioclase phenocrysts within basaltic melt, studied via petrography at museums and universities such as the American Museum of Natural History and Geological Society of America. Hydrothermal alteration, fumarolic activity, and subsidence structures link the crater to processes observed at Crater Lake and Mount St. Helens in comparative volcanology.

Eruptive history

Kīlauea Iki erupted episodically during Holocene activity of the Kīlauea complex, with prehistoric episodes inferred from tephra stratigraphy correlated to sites investigated by teams from Smithsonian Institution, USGS Hawaiian Volcano Observatory, and University of Hawaiʻi. Deposits include spatter, scoria, and thin tephra layers similar to historic outbursts studied at Parícutin, Eyjafjallajökull, and Mount Etna. Radiocarbon and paleomagnetic dating by scientists at Scripps Institution of Oceanography and Oregon State University have helped place eruptive pulses within broader Hawaiian Islands volcanic cycles linked to shifts in magma supply from the mantle plume.

1959 eruption

The 1959 event began with increased seismicity recorded by the U.S. Geological Survey and seismic networks operated by University of Hawaiʻi at Mānoa, followed by the opening of fissures and the formation of a lava lake that rose and solidified across the crater floor. Observers from Hawaiʻi Volcanoes National Park and researchers from USGS Hawaiian Volcano Observatory documented lava fountains exceeding 580 meters, producing tephra and lava flows that reshaped the floor and deposited glassy clinker studied by petrologists at California Institute of Technology and University of California, Berkeley. The eruption prompted coordination among Civil Defense, National Park Service, and local government agencies in Hawaiʻi County and influenced later hazard planning by entities including Federal Emergency Management Agency and the International Association of Volcanology and Chemistry of the Earth's Interior.

Ecology and environment

Following cooling, the crater floor developed primary successional habitats studied by ecologists from University of Hawaiʻi at Mānoa, Hawaii Institute of Marine Biology, and international teams from University of Oxford and University of Tokyo, documenting colonization by ferns, lichens, and endemic Hawaiian plants such as Metrosideros polymorpha. The crater hosts specialized arthropod assemblages observed by researchers affiliated with Bishop Museum and bird surveys reporting species like ʻApapane and ʻŌmaʻo in surrounding forests. Soils and microhabitats influenced by basaltic substrate have been compared with revegetation at Mount Pinatubo and Iceland restoration projects, with conservation input from The Nature Conservancy and local ʻāina stewards.

Human interaction and cultural significance

Kīlauea Iki lies within lands sacred to Hawaiian cultural practitioners and communities including Kamehameha I lineage sites and traditional chants recorded by scholars at Bishop Museum and University of Hawaiʻi. The crater and nearby Halemaʻumaʻu feature in Hawaiian cosmology involving deities such as Pele and have been subjects of oral histories curated by institutions like the Hawaiian Historical Society. Recreational hikers access trails maintained by the National Park Service and tourism operators from Hawaiʻi County, while educational outreach integrates curricula from Kamehameha Schools and university field courses. Past controversies over access and preservation engaged stakeholders such as Office of Hawaiian Affairs and community groups advocating for cultural site protection.

Monitoring and research

Continuous monitoring at the site is conducted by the USGS Hawaiian Volcano Observatory using seismometers, GPS stations, gas sensors, and thermal cameras, with collaboration from NASA remote sensing programs and international networks like the Global Volcanism Program. Research topics include lava lake dynamics, magma chamber processes, gas emissions (sulfur dioxide measured alongside work by Environmental Protection Agency scientists), and analog experiments performed at labs in California Institute of Technology and Imperial College London. Ongoing publications appear in journals such as Journal of Volcanology and Geothermal Research, Geology, and Science, informing hazard mitigation by agencies including FEMA and contributing to comparative studies with volcanoes like Krakatoa and Nyiragongo.

Category:Volcanoes of Hawaii Category:Hawaiian volcanoes