Volcanos

Roundup of Global Volcanic Activity – Ongoing Activity for the week of 21 February - 27 February 2018

Ambae | Vanuatu : Based on satellite and webcam observations, the Wellington VAAC reported that on 24 February an ash plume from Ambae rose to an altitude of 4 km (13,000 ft) a.s.l. and drifted NW.

Bagana | Bougainville (Papua New Guinea) : Based on analyses of satellite imagery and model data, the Darwin VAAC reported that during 26-27 February ash plumes from Bagana rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted WNW.

Cleveland | Chuginadak Island (USA) : AVO reported that a small explosion at Cleveland was detected in seismic and infrasound data at 2154 on 21 February. A satellite image acquired several hours after the event showed an area of moderately elevated surface temperatures extending about 2 km ESE from the summit, indicative of a warm deposit. The Aviation colour Code remained at Yellow and the Volcano Alert Level remained at Advisory.

Dukono | Halmahera (Indonesia) : Based on analyses of satellite imagery, wind model data, and notices from PVMBG, the Darwin VAAC reported that during 21-27 February ash plumes from Dukono rose to an altitude of 1.8 km (6,000 ft) a.s.l. and drifted in multiple directions.

Ebeko | Paramushir Island (Russia) : Based on observations by volcanologists in Severo-Kurilsk (Paramushir Island), about 7 km E of Ebeko, explosions during 17-18 and 20-21 February generated ash plumes that rose as high as 2.4 km (7,900 ft) a.s.l. Ashfall was reported in Severo-Kurilsk during 17-18 February. The Aviation colour Code remained at Orange (the second highest level on a four-colour scale).

Karymsky | Eastern Kamchatka (Russia) : KVERT reported that a thermal anomaly over Karymsky was identified in satellite images on 18 February. The Aviation colour Code remained at Orange (the second highest level on a four-colour scale).

Kilauea | Hawaiian Islands (USA) : During 21-27 February HVO reported that the lava lake continued to rise, fall, and spatter in Kilauea’s Overlook crater. Webcams recorded incandescence from a small lava pond in a pit on the W side of Pu'u 'O'o Crater. Surface lava flows were active above and on the pali, and on the coastal plain. A small portion of material from the inner veneer of the crater wall collapsed into the lava lake just after 0700 on 23 February.

Sabancaya | Peru : Observatorio Vulcanológico del Sur del IGP (OVS-IGP) and Observatorio Vulcanológico del INGEMMET (OVI) reported that explosive activity at Sabancaya was similar to the previous week; there was an average of 17 explosions recorded per day during 19-25 February. Seismicity was dominated by long-period events, with signals indicating emissions. Gas-and-ash plumes rose 4.5 km above the crater rim and drifted 50 km NW, SW, S, and SE. The MIROVA system detected one thermal anomaly. The sulfur dioxide flux was high, at 2,092 tons per day on 25 February. The report noted that the public should not to approach the crater within a 12-km radius.

Sheveluch | Central Kamchatka (Russia) : KVERT reported that a thermal anomaly over Sheveluch was identified in satellite images during 16, 18, and 20-21 February. The Aviation colour Code remained at Orange.

Turrialba | Costa Rica : OVSICORI-UNA reported that an event at Turrialba at 0800 on 27 February generated a plume that rose 100 m above the crater rim and drifted SW.