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| 1984 eruption of Mauna Loa | |
|---|---|
| Name | 1984 eruption of Mauna Loa |
| Date | March–April 1984 |
| Volcano | Mauna Loa |
| Location | Island of Hawaii Island, Hawaii |
| Type | Shield volcano, fissure eruption |
| Impact | Lava flows threatened Hilo and Highway 19 |
1984 eruption of Mauna Loa was a notable eruption of Mauna Loa on the island of Hawaii Island that began in late March 1984 and lasted into April, producing fast-moving ʻaʻā lava flows from an extensive northeast rift zone fissure system. The event threatened populated areas including Hilo and infrastructure like Highway 19, prompted emergency action by local authorities including Hawaii County officials and drew international attention from organizations such as the United States Geological Survey and the National Oceanic and Atmospheric Administration. The eruption provided important observational data for volcanologists from institutions like the University of Hawaii at Manoa and the Scripps Institution of Oceanography.
In the months preceding March 1984, Mauna Loa exhibited increased seismicity recorded by United States Geological Survey seismic stations, ground deformation detected by tiltmeters maintained by the Hawaii Volcano Observatory, and fumarolic changes observed by researchers from the University of Hawaii at Manoa. Historical patterns of Mauna Loa eruptions that included events in 1950 and 1975, documented in archives of the United States Geological Survey and reports by the American Geophysical Union, informed hazard assessments by Hawaii County emergency planners and scientists at the Hawaii Volcano Observatory. The pre-eruption unrest prompted coordination among officials from Hawaii County, representatives of the State of Hawaii, and specialists from the National Oceanic and Atmospheric Administration.
The eruption commenced on 24 March 1984 with fissures opening along Mauna Loa’s northeast rift zone, a pattern consistent with earlier eruptions cataloged by the United States Geological Survey and studies published in journals affiliated with the American Geophysical Union. Lava fountains and rapidly advancing ʻaʻā flows were photographed and reported by field teams from the Hawaii Volcano Observatory and researchers at the University of Hawaii at Manoa, while meteorological observations by the National Weather Service supported plume tracking used in advisories by the Federal Aviation Administration. Over subsequent days, lava extended downslope toward the Hilo area, prompting actions by the Hawaii County Police Department and coordination with personnel from the Hawaii Civil Defense. By early April the eruption tapered, and eruptive activity ceased as effusion declined and fissures sealed; post-eruption surveys were led by teams from the United States Geological Survey and academic groups including the Scripps Institution of Oceanography.
Lava from the northeast rift-zone fissures advanced in ʻaʻā channels and lava tubes described in field reports produced by the Hawaii Volcano Observatory and investigators at the University of Hawaii at Manoa, threatening urban areas such as Hilo and infrastructure including Highway 19 and utility lines maintained by the Hawaiian Electric Industries. Volcanic hazards documented during the event included fast-moving surface flows, tephra fallout recorded by observers from the National Oceanic and Atmospheric Administration, and vog conditions monitored by the Environmental Protection Agency and researchers affiliated with the University of Hawaii at Manoa. Emergency management agencies including Hawaii County Civil Defense implemented road closures and evacuation readiness plans that referenced contingency protocols used in prior eruptions of Mauna Loa and Kīlauea.
Monitoring during the crisis relied on seismic networks operated by the United States Geological Survey and tilt and GPS observations conducted by the Hawaii Volcano Observatory and instrumentation funded through collaborations with the National Science Foundation. Real-time outreach and hazard communication involved the Hawaii County Civil Defense, the State of Hawaii emergency apparatus, and federal partners such as the Federal Emergency Management Agency. Scientific teams from the University of Hawaii at Manoa, the Scripps Institution of Oceanography, and international collaborators provided rapid field reconnaissance while the Federal Aviation Administration and the National Oceanic and Atmospheric Administration coordinated flight and air quality advisories to protect aviation and public health.
Despite the rapid advance of flows, no fatalities occurred and damage to populated areas was limited due to successful protective measures executed by Hawaii County authorities in coordination with the State of Hawaii and federal agencies including the Federal Emergency Management Agency. Economic impacts were absorbed in part by insurance and recovery programs overseen by the State of Hawaii and Hawaii County, while infrastructure repairs involved utility companies such as Hawaiian Electric Industries and transportation agencies responsible for Highway 19. The eruption prompted reviews of emergency plans by the Hawaii Civil Defense and policy discussions in the Hawaii State Legislature about land-use, development, and hazard mitigation on Hawaii Island.
The 1984 eruption yielded important datasets that informed volcanic hazard science by researchers at the United States Geological Survey, the University of Hawaii at Manoa, and the Scripps Institution of Oceanography, and contributed to published analyses in forums of the American Geophysical Union and the Geological Society of America. Studies leveraged seismic records, deformation measurements, and flow mapping to improve understanding of rift-zone dynamics of shield volcanoes such as Mauna Loa and comparative work with Kīlauea and other basaltic systems documented by the United States Geological Survey. The event stimulated advances in monitoring technologies supported by the National Science Foundation and led to enhanced hazard communication protocols involving the Hawaii County Civil Defense, the State of Hawaii, and federal agencies including the Federal Emergency Management Agency.
Category:Mauna Loa Category:1984 natural disasters Category:Volcanic eruptions in Hawaii