Volcanos

Global Volcanic Activity - Ongoing Activity for the week of 3 July - 9 July 2019

Aira | Kyushu (Japan) : JMA reported that at 1044 on 4 July an explosion at Minamidake crater (at Aira Caldera’s Sakurajima volcano) generated an ash plume that rose 3.2 km above the crater rim and ejected material 1.1 km from the vent. The Alert Level remained at 3 (on a 5-level scale).

Asosan | Kyushu (Japan) : JMA reported that minor explosive events on 4 and 5 July at Asosan’s Nakadake Crater ejected sediment from the vent. Sulfur dioxide emissions were 1,300 tons per day on 5 July. The Alert Level remained at 2 (on a scale of 1-5).

Asosan | Kyushu (Japan) : JMA reported that minor explosive events on 4 and 5 July at Asosan’s Nakadake Crater ejected sediment from the vent. Sulfur dioxide emissions were 1,300 tons per day on 5 July. The Alert Level remained at 2 (on a scale of 1-5).

Colima | Mexico : Centro Universitario de Estudios e Investigaciones de Vulcanologia - Universidad de Colima reported that intermittent steam-and-gas emissions, mainly from the NE side of the crater, and three small explosions were recorded during 29 June-5 July. A thermal camera located S of the volcano recorded thermal anomalies associated with emissions. Weather conditions sometimes prevented observations of the crater.

Dukono | Halmahera (Indonesia) : Based on satellite and wind model data, and notices from PVMBG, the Darwin VAAC reported that during 3-9 July ash plumes from Dukono rose to altitudes of 1.8-2.1 km (6,000-7,000 ft) a.s.l. and drifted in multiple directions. The Alert Level remained at 2 (on a scale of 1-4), and the public was warned to remain outside of the 2-km exclusion zone.

Ebeko | Paramushir Island (Russia) : Volcanologists in Severo-Kurilsk (Paramushir Island), about 7 km E of Ebeko, observed explosions during 28 June-5 July that sent ash plumes up to 4.5 km (14,800 ft) a.s.l. The plumes drifted in multiple directions. A thermal anomaly was visible in satellite images on 29 June and 1 July. The Aviation colour Code remained at Orange (the second highest level on a four-colour scale).

Ibu | Halmahera (Indonesia) : The Darwin VAAC reported that on 6 July an ash plume from Ibu rose to 2.1 km (7,000 ft) a.s.l. and drifted N, based on satellite images and weather models. An intermittent thermal anomaly was also visible. The Alert Level remained at 2 (on a scale of 1-4), and the public was warned to stay at least 2 km away from the active crater, and 3.5 km away on the N side.

Karymsky | Eastern Kamchatka (Russia) : KVERT reported that a thermal anomaly over Karymsky was identified in satellite images during 30 June-3 July. The Aviation colour Code remained at Orange (the second highest level on a four-colour scale).

Klyuchevskoy | Central Kamchatka (Russia) : KVERT reported that a weak thermal anomaly over Klyuchevskoy was visible in satellite images during 1-3 July, and ash plumes drifted as far as 85 km E and SE during 1-2 July. The Aviation colour Code remained at Orange (the second highest level on a four-colour scale).

Krakatau | Indonesia : PVMBG reported that Anak Krakatau’s seismic network recorded eight eruptive events during 1-7 July. The events were not followed by visible ash emissions, though observations were hindered by weather conditions. The Alert Level remained at 2 (on a scale of 1-4), and the public was warned to remain outside of the 2-km radius hazard zone from the crater.

Merapi | Central Java (Indonesia) : PVMBG reported that during 28 June-4 July the lava-dome volume at Merapi did not significantly change and was an estimated 475,000 cubic meters, based on analyses of drone images taken on 4 July. Extruded lava fell into the upper parts of the SE flank, generating one block-and-ash flow that traveled 1.1 km down the Gendol drainage on 1 July. White plumes rose as high as 200 m above the summit. The Alert Level remained at 2 (on a scale of 1-4), and residents were warned to remain outside of the 3-km exclusion zone.

Nevados de Chillan | Chile : ONEMI and SERNAGEOMIN reported that an explosive event at Nevados de Chillán’s Nicanor Crater recorded at 0550 on 9 July was associated with a long-period earthquake signal. The explosion ejected incandescent material onto areas near the crater. The Alert Level remained at Orange, the second highest level on a four-colour scale, and residents were reminded not to approach the crater within 3 km. ONEMI maintained an Alert Level Yellow (the middle level on a three-colour scale) for the communities of Pinto, Coihueco, and San Fabián.

Sangay | Ecuador : IG reported that a new eruption at Sangay began on 7 May and was continuing as of 3 July. Activity was concentrated at two eruptive centers: the Central Crater and the Ñuñurcu dome (located 190 m SSE of Central Crater). Sporadic explosions at Central Crater produced ash plumes that rose as high as 1.1 km above the crater rim and drifted W and SW. The Ñuñurcu dome fed at least three lava flows that traveled down the SE flank. Collapses of the lava-flow fronts generated small pyroclastic flows and numerous block flows that traveled as far as 3,888 m elevation. Staff of the Parque Nacional Sangay observed atypical sedimentation consisting of volcanic material at the confluence of the Upano River and its tributary, the Volcán River, 23 km SE of the summit. Areas of steaming in the Volcán River were possibly from hot blocks originating from the volcano. Residents of Macas (42 km SSE) reported increased turbidity in the Upano from pyroclastic material.

Sangeang Api | Indonesia : The Darwin VAAC reported that during 4-5 July ash plumes from Sangeang Api were visible in satellite images rising to 2.1-2.3 km (7,000-8,000 ft) a.s.l. and drifting SW and W. During 6-9 July multiple ash plumes rose to 3-4.6 km (10,000-15,000 ft) a.s.l. and drifted N, NW, and SW. Thermal anomalies were visible on 4 and 8 July.

Sheveluch | Central Kamchatka (Russia) : KVERT reported that a thermal anomaly over Sheveluch’s lava dome was identified daily in satellite images during 28 June-5 July. The Aviation colour Code remained at Orange (the second highest level on a four-colour scale).