Volcanos

Roundup of Global Volcanic Activity - Ongoing Activity for the week of 26 July - 1 August 2017

Aira | Kyushu (Japan) : colourJMA reported two events at Showa Crater (at Aira Caldera’s Sakurajima volcano) during 24-28 July. One of the events generated an ash plume that rose 2 km above the crater rim. The Alert Level remained at 3 (on a 5-level scale).

Bagana | Bougainville (Papua New Guinea) : Based on analyses of satellite imagery and model data, the Darwin VAAC reported that on 1 August an ash plume from Bagana drifted W at an altitude of 2.1 km (7,000 ft) a.s.l.

Bezymianny | Central Kamchatka (Russia) : KVERT reported that during 21-28 July a thermal anomaly was identified daily over Bezymianny in satellite images. A lava flow continued to flow down the W flank of the dome. The Aviation colour Code remained at Orange (the second highest level on a four-colour scale).

Bogoslof | Fox Islands (USA) : AVO reported that during 26 July-1 August no activity at Bogoslof was observed in partly cloudy to clear satellite images, and no activity was detected in seismic, infrasound, or lightning data. The Aviation colour Code remained at Orange and the Volcano Alert Level remained at Watch.

Cleveland | Chuginadak Island (USA) : AVO reported that during 26 July-1 August no activity was observed in seismic or infrasound data at Cleveland. The small lava dome on the floor of the crater had grown from 30 m in diameter to 42, and continued to inflate; the surface area of the dome was at least 50 x 45 m (~2,100 square meters), which was an increase of about 75% since 25 July (~1,200 square meters). Steam plumes rising from the crater were recorded by the webcam during 25 and 29-30 July, and elevated surface temperatures (consistent with lava-dome growth) were identified in satellite images during 30 July-1 August. The Aviation colour Code remained at Orange and the Volcano Alert Level remained at Watch.

Colima | Mexico : On 2 June the Centro Universitario de Estudios e Investigaciones de Vulcanologia - Universidad de Colima reported that during the previous week seismic data revealed 45 high-frequency events, 12 long-period events, 1.2 hours of tremor, 3 landslides, and one low-intensity explosion. Two lahars descended the La Lumbre ravine (SW) and three descended the Montegrande ravine (SSE); both ravines are in Colima state.

Dukono | Halmahera (Indonesia) : Based on analyses of satellite imagery, wind model data, and notices from PVMBG, the Darwin VAAC reported that during 26 July-1 August ash plumes from Dukono rose to altitudes of 2.1-2.7 km (7,000-9,000 ft) a.s.l. and drifted in multiple directions.

Kilauea | Hawaiian Islands (USA) : During 26 July-1 August HVO reported that the lava lake continued to rise, fall, and spatter in Kilauea’s Overlook crater. Webcams recorded incandescence from long-active sources within Pu'u 'O'o Crater. The 61G lava flow, originating from a vent on Pu'u 'O'o Crater's E flank, continued to enter the ocean at Kamokuna. Several large cracks running parallel to the coastline spanned the width of the delta. Surface lava flows were active above the pali and on the coastal plain about 2 km upslope from the gravel emergency route.

Klyuchevskoy | Central Kamchatka (Russia) : KVERT reported that during 22-27 July ash plumes from Klyuchevskoy were identified in satellite images drifting 120 km E and NE. The Aviation colour Code remained at Orange (the second highest level on a four-colour scale).

Poas | Costa Rica : OVSICORI-UNA reported that on 1 August an event at Poás passively produced a plume that rose 500 m above the crater.

Sabancaya | Peru : Observatorio Vulcanológico del Sur del IGP (OVS-IGP) and Observatorio Vulcanológico del INGEMMET (OVI) reported that explosive activity at Sabancaya increased compared to the previous week; there was an average of 40 explosions recorded per day during 24-30 July. Gas-and-ash plumes rose 5 km above the crater rim and drifted more than 50 km NW and SE. Sulfur dioxide flux was as high as 2,530 tons per day, recorded on 28 July. The MIROVA system detected nine thermal anomalies.

Sheveluch | Central Kamchatka (Russia) : KVERT reported that a thermal anomaly was identified daily during 21-28 July in satellite images over Sheveluch. Strong explosions on 23 July generated ash plumes that rose 11-12 km (36,100-39,400 ft) a.s.l. and during 23-24 July drifted 1,400 km E. The Aviation colour Code remained at Orange.

Sinabung | Indonesia : Based on PVMBG observations, satellite images, and wind data, the Darwin VAAC reported that during 26-29 and 31 July ash plumes from Sinabung rose 3.3-4.6 km (11,000-15,000 ft) a.s.l. and drifted NE, ENE, and ESE.

Turrialba | Costa Rica : OVSICORI-UNA reported that on 26 July an event at Turrialba passively produced a plume that rose 300 m above the crater and drifted SW.