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| Sakurajima (2016 crisis) | |
|---|---|
| Name | Sakurajima |
| Location | Kagoshima Prefecture, Kyushu, Japan |
| Type | Stratovolcano / Active volcano |
| Elevation | 1117 m |
| Coordinates | 31°35′N 130°38′E |
| Last eruption | 2016 (major crisis) |
Sakurajima (2016 crisis) was a major eruptive episode at the stratovolcano located near Kagoshima in Kyushu that intensified in 2016, producing ash plumes, pyroclastic flows, and lahars which threatened Kagoshima (city), Kagoshima Prefecture, and nearby communities on Kagoshima Bay. The crisis prompted emergency measures by the Japan Meteorological Agency, coordination with the Self-Defense Forces (Japan), and international attention from agencies including the United States Geological Survey, Global Volcanism Program, and academic institutions such as Kyoto University and Tohoku University. The episode catalyzed revisions to hazard maps used by the Ministry of Land, Infrastructure, Transport and Tourism (Japan) and influenced planning by local authorities like the Kagoshima City Hall and regional entities such as the Kyushu Electric Power Company.
Sakurajima, once an island and now connected to the Osumi Peninsula by lava flows, is part of the Aira Caldera complex formed by explosive eruptions associated with the Ryukyu Arc and the subduction of the Philippine Sea Plate beneath the Eurasian Plate. Historical eruptions at Sakurajima include major events in 1914 and frequent activity throughout the 20th century, prompting study by institutions like the Volcanological Society of Japan, University of Tokyo's volcano observatories, and researchers affiliated with the Japan Agency for Marine-Earth Science and Technology. Pre-2016 monitoring infrastructure included seismographs operated by the Japan Meteorological Agency, GPS networks linked to the Geological Survey of Japan, and remote-sensing support from satellites such as GCOM-W and Terra (satellite).
In early 2016, increased seismicity beneath Sakurajima was detected by the Japan Meteorological Agency network and flagged by scientists at Kyushu University and Hokkaido University. By March 2016, eruptive activity escalated with significant ash emissions observed by the Aviation Meteorology Service and monitored by the International Civil Aviation Organization through the Volcanic Ash Advisory Center. Major explosive events in April and May produced plumes recorded by the MODIS sensor aboard Aqua (satellite) and prompted ashfall alerts from the Kagoshima Prefectural Office. A sequence of pyroclastic flows and summit collapses in June registered on broadband seismometers maintained by the National Research Institute for Earth Science and Disaster Resilience and triggered evacuations coordinated with the Japan Ground Self-Defense Force and municipal disaster management units. Sporadic eruptions continued into late 2016, with episodes documented by teams from Nagoya University, Osaka University, and the Geological Society of Japan.
The 2016 crisis produced a range of hazards: ballistic ejecta, ash fallout affecting Kagoshima Airport, pyroclastic density currents that threatened low-lying areas around Sakurajima Port, and lahars mobilized during heavy rainfall linked to Seasonal rain fronts monitored by the Japan Meteorological Agency. Seismic swarms, inflation measured by continuous GPS operated by the Geospatial Information Authority of Japan, and sulfur dioxide fluxes recorded by researchers at Tohoku University indicated magmatic intrusion beneath the summit. Aviation impacts were assessed by the International Air Transport Association, while public-health concerns over particulate matter involved the Ministry of Health, Labour and Welfare (Japan) and local hospitals such as Kagoshima University Hospital.
The human and infrastructure impacts included ash accumulation on roads and rail lines managed by JR Kyushu, interruptions of ferry services linked to Japan Coast Guard advisories, and damage to agricultural areas overseen by the Ministry of Agriculture, Forestry and Fisheries (Japan). Emergency response involved coordination among the Japan Meteorological Agency, Fire and Disaster Management Agency (Japan), and local governments including Tarumizu City and Kagoshima City. The Self-Defense Forces (Japan) provided logistical support, while international scientific cooperation included exchanges with the USGS and research teams from Riken and ETH Zurich. Economic effects were noted by the Tokyo Stock Exchange-listed companies operating in Kagoshima and by tourism operators serving visitors to attractions like Kennin-ji and ferry routes to Yakushima.
The crisis accelerated deployment of instruments by the Japan Meteorological Agency, enhanced infrasound arrays from Kyoto University teams, and new gas-monitoring stations established by Nagoya University. Remote-sensing analyses utilized data from Sentinel-2 and Landsat 8, while petrological studies of erupted tephra were carried out by researchers at University of Tokyo and Hiroshima University. Collaborative research projects funded by the Japan Society for the Promotion of Science integrated multidisciplinary expertise from University of Oxford, Columbia University, and local institutions to model eruption dynamics and refine eruption forecasting methods used by the Volcanological Society of Japan.
After 2016, revisions to hazard zonation by the Kagoshima Prefectural Government and updates to national contingency plans influenced infrastructure investments by the Ministry of Land, Infrastructure, Transport and Tourism (Japan) and emergency-preparedness procedures at Kagoshima Airport and regional ports. Scientific outcomes included improved eruption forecasting protocols adopted by the Japan Meteorological Agency and published studies in journals affiliated with the Geological Society of America and Springer Nature. The 2016 crisis also shaped community resilience programs run by local NGOs and municipal offices, and informed international disaster-risk reduction dialogues at forums hosted by the United Nations Office for Disaster Risk Reduction and the Asian Disaster Reduction Center.
Category:Volcanic eruptions in Japan Category:Sakurajima