Volcanos

Roundup of Global Volcanic Activity – Ongoing Activity for the week 27 April – 3 May 2022

Aira – Kyushu (Japan) : JMA reported that a very small eruptive event was recorded at Minamidake Crater (at Aira Caldera’s Sakurajima volcano) on 2 May.

Ambae – Vanuatu : On 28 April the Vanuatu Meteorology and Geo-Hazards (VMGD) reported that the cone in Ambae’s Lake Voui continued to produce steam and ash emissions.

Ambrym – Vanuatu : The Vanuatu Meteorology and Geo-Hazards Department (VMGD) reported that incandescence from Ambrym’s Benbow Crater was visible during 25 January-3 February from a lava flow that had effused from a new vent on the NW part of the crater floor. Recent observations indicated that gas and ash was no longer being emitted from the crater, and seismicity had decreased and stabilized.

Dukono – Halmahera : Based on satellite and wind model data, the Darwin VAAC reported that during 27-29 April and 2-3 May ash plumes from Dukono rose to 2.1 km (7,000 ft) a.s.l. and drifted E, NE, N, and NW.

Great Sitkin – Andreanof Islands (USA) : AVO reported that slow lava effusion at Great Sitkin likely continued during 27 April-3 May; no significant seismic activity was detected and weather clouds obscured webcam and satellite views.

Kilauea – Hawaiian Islands (USA) : HVO reported that lava continued to effuse from a vent in the lower W wall of Kilauea’s Halema`uma`u Crater during 26 April-3 May, entering the active lava lake and flowing onto the crater floor. Roiling and spattering in the SE part of the lake was visible during 26-27 April. The surface of the lava lake was active all week, and the height of the lake fluctuated; the lake occasionally overflowed the rim, sending lava onto the crater floor. Daily breakouts occurred along the margins of the crater rim.

Lewotolok – Lembata Island : PVMBG reported that the eruption at Lewotolok continued during 26 April-4 May. Daily white-and-gray ash plumes rose 50-600 m above the summit and drifted in multiple directions. Images of the volcano showed incandescent material being ejected above the crater rim.

Manam – Northeast of New Guinea : The Darwin VAAC reported that on 1 May ash plumes from Manam rose to 2.7 km (9,000 ft) a.s.l. and drifted SE and ESE based on information from RVO, satellite images, and weather models. During 2-3 May low-level ash emissions rose to 2.1 km (7,000 ft) a.s.l. and drifted ESE.

Merapi – Central Java : BPPTKG reported that the eruption at Merapi continued during 22-28 April. The heights and morphologies of the SW lava dome and the central lava dome were unchanged from the previous week, and seismicity remained at high levels. As many as 102 lava avalanches traveled a maximum of 2 km, mostly down the Bebeng drainage on the SW flank.

Pavlof – Alaska Peninsula, Alaska : AVO reported that the eruption at a vent on Pavlof’s upper E flank was ongoing during 26 April-3 May, though weather conditions sometimes prevented visual observations. Seismic tremor persisted and elevated surface temperatures were identified in satellite images almost daily. A short lava flow had descended the E flank during 26-28 April and was about 500 m long. Steaming from the active vent was visible during 30 April-2 May.

Semeru – Eastern Java : PVMBG reported that the eruption at Semeru continued during 26 April-3 May. Almost daily ash plumes were visible rising 300-700 m above the summit that drifted W, SW, and E. Ash plumes were recorded at 0523 and 0557 on 28 April, 0502 and 0649 on 29 April, 0621 on 30 April, 0704 on 2 May, and 0922 on 3 May. A pyroclastic flow from the end of the lava flow descended the SE flank at 0630 on 1 May and produced ash plumes that rose as high as 500 m above the summit.

Semisopochnoi – Aleutian Islands (USA) : AVO reported that low-level eruptive activity at Semisopochnoi’s North Cerberus cone continued during 26 April-3 May. Tremor continued to be detected by the seismic network. Weather clouds obscured views of the volcano on most days, though occasional views during 27-29 May revealed new ash deposits on the flanks.

Sheveluch – Central Kamchatka (Russia) : KVERT reported that a thermal anomaly over Sheveluch was identified in satellite images during 22-29 April, and lava-dome extrusion continued.

Suwanosejima – Ryukyu Islands (Japan) : JMA reported that eruptive activity continued to be recorded at Suwanosejima’s Ontake Crater during 25 April-2 May. Eruption plumes rose as high as 800 m above the crater rim and crater incandescence was occasionally visible. One explosion, recorded in Toshima village (3.5 km SSW), generated an ash plume that rose 1.3 km and into weather clouds.

Wolf – Isla Isabela (Galapagos) : IG reported that thermal anomalies over Wolf were periodically identified in satellite images during 26 April-3 May, indicating active lava flows.

Yasur – Vanuatu : On 28 April Vanuatu Meteorology and Geohazards Department (VMGD) reported that activity at Yasur continued at a high level of “major unrest,” as defined by the Alert Level 2 status (the middle level on a scale of 0-4). Ash-and-gas emissions and loud explosions continued to be recorded, with bombs falling in and around the crater.

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