Volcanos

Roundup of Global Volcanic Activity – Ongoing Activity for the week of 28 March - 3 April 2018

Dukono | Halmahera (Indonesia) : Based on analyses of satellite imagery and wind model data, the Darwin VAAC reported that during 28 and 30 March and 1-3 April ash plumes from Dukono rose to altitudes of 1.5-2.1 km (5,000-7,000 ft) a.s.l. and drifted ENE, E, and ESE.

Ebeko | Paramushir Island (Russia) : Based on observations by volcanologists in Severo-Kurilsk (Paramushir Island), about 7 km E of Ebeko, explosions during 23-25 and 28-29 March generated ash plumes that rose as high as 2.3 km (7,500 ft) a.s.l. 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 during 23-26 March. The Aviation colour Code remained at Orange (the second highest level on a four-colour scale).

Kilauea | Hawaiian Islands (USA) : During 28 March-3 April HVO reported that the lava lake continued to rise, fall, and spatter in Kilauea’s Overlook crater. Surface lava flows were active above Pulama pali. Webcams recorded spattering from a small lava pond in a pit on the W side of Pu'u 'O'o Crater. The lava flow from a vent on the SE part of the crater floor continued to expand.

Mayon | Luzon (Philippines) : On 29 March PHIVOLCS lowered the Alert Level for Mayon to 2 (on a 0-5 scale) noting a deflationary trend since 20 February, decreased seismicity, a lower sulfur dioxide flux, and decreased surficial activity. During the previous two weeks the number of rockfalls from collapse of unstable lava-flow deposits fell from a peak of 82 to less than 10 per day. Sulfur dioxide flux ranged from 500 to 2,000 tonnes/day during the previous two weeks, lower than 700-4,500 tonnes/day during 13 January-8 March. Lava last effused from the crater on 18 March, and crater incandescence from hot gas emissions had become faint. Fewer rockfalls and pyroclastic flows were noted as the lava flows stabilized; at 0934 on 27 March one pyroclastic flow traveled down the Bonga-Buyuan drainage and produced a dirty-white ash cloud that drifted SW. During 30 March-3 April a few rockfalls were recorded, there was faint crater incandescence, and steam plumes drifted SW, WNW, and NW. PHIVOLCS reminded residents to stay away from the 6-km-radius Permanent Danger Zone.

Sabancaya | Peru : Observatorio Vulcanológico del Sur del IGP (OVS-IGP) and Observatorio Vulcanológico del INGEMMET (OVI) reported that explosive activity at Sabancaya was similar compared to the previous week; explosions averaged 18 per day during 26 March-1 April. Seismicity was dominated by long-period events, with signals indicating emissions. Gas-and-ash plumes rose as high as 4.7 km above the crater rim and drifted 50 km SW and NW. The sulfur dioxide flux was high, at 2,855 tons per day on 30 March. The MIROVA system detected six thermal anomalies. On 28 March a lahar which began at 1113 descended the SE flank towards the Sallalli river. 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 weak thermal anomaly over Sheveluch was identified in satellite images during 23-30 March. The Aviation colour Code remained at Orange.

Suwanosejima | Ryukyu Islands (Japan) : Based on JMA notices and satellite data, the Tokyo VAAC reported that during 28-30 March and 2 April explosions at Suwanosejima produced plumes that rose 1.2-2.7 km (4,000-9,000 ft) a.s.l. and drifted NE, NW, W, SW, and S.

Turrialba | Costa Rica : OVSICORI-UNA reported that events at Turrialba at 1802 on 31 March and 0838 on 1 April generated plumes that rose 400 and 500 m above the crater rim, and drifted SW and NW, respectively. An event at 0700 on 3 April produced an ash plume that rose 500 m and went NW; passive ash emissions followed.