JMA reported that 12 explosions from Showa Crater at Aira Caldera’s Sakurajima volcano ejected tephra as far as 1,300 m during 26-29 September. Incandescence from Showa Crater was visible at night during 26-27 September. An explosion on 28 September produced a dense ash plume that rose 3 km. The Alert Level remained at 3 (on a scale of 1-5). The Tokyo VAAC reported that during 24-30 September plumes rose to altitudes of 1.8-4 km (6,000-13,000 ft) a.s.l. and drifted W, S, SE, and E. On 27 September a pilot observed an ash plume that rose to an altitude of 4.3 km (14,000 ft) a.s.l.

Geological Summary. The Aira caldera in the northern half of Kagoshima Bay contains the post-caldera Sakurajima volcano, one of Japan's most active. Eruption of the voluminous Ito pyroclastic flow accompanied formation of the 17 x 23 km caldera about 22,000 years ago. The smaller Wakamiko caldera was formed during the early Holocene in the NE corner of the caldera, along with several post-caldera cones. The construction of Sakurajima began about 13,000 years ago on the southern rim and built an island that was joined to the Osumi Peninsula during the major explosive and effusive eruption of 1914. Activity at the Kitadake summit cone ended about 4,850 years ago, after which eruptions took place at Minamidake. Frequent eruptions since the 8th century have deposited ash on the city of Kagoshima, located across Kagoshima Bay only 8 km from the summit. The largest recorded eruption took place during 1471-76.

Sources: Japan Meteorological Agency (JMA), Tokyo Volcanic Ash Advisory Center (VAAC)