Volcanos

Roundup of Global Volcanic Activity – Ongoing Activity for the week 17 August – 23 August 2022

Aira – Kyushu (Japan) : JMA reported that 0009 on 15 August an explosion at Minamidake Crater (at Aira Caldera’s Sakurajima volcano) generated an ash plume that rose 2 km above the crater rim. Sulfur dioxide emissions were slightly high at 1,500 tons per day, measured during a field visit on 16 August. Two eruptive events were recorded during 19-22 August.

Bezymianny – Central Kamchatka (Russia) : The Tokyo VAAC reported that on 22 August an ash plume from Bezymianny was identified in a satellite image rising to 3.7 km (12,000 ft) a.s.l. and drifting NE.

Bulusan – Luzon (Philippines) : PHIVOLCS lowered the Alert Level for Bulusan to 0 (on a scale of 0-5) on 21 August, noting that unrest had further declined to background levels. The frequency of volcanic earthquakes declined to baseline levels during the third week of July. Deformation data showed short-term inflation at the SE flank, though long-term data showed no deformation associated with the volcano. Sulfur dioxide emissions averaged 1,900 tonnes/day during 5-12 June and declined to about 230 tonnes/day during 25 July-6 August. Steam-laden emissions from the active vents declined to low-to-moderate levels.

Ebeko – Paramushir Island (Russia) : KVERT reported that moderate activity at Ebeko was ongoing. A thermal anomaly over the volcano was identified in satellite images on 13 and 18 August. According to volcanologists in Severo-Kurilsk (Paramushir Island, about 7 km E) explosions generated ash plumes that rose up to 3.5 km (11,500 ft) a.s.l. during 15-18 August; ash plumes drifted more than 65 km SE during 17-18 August.

Great Sitkin – Andreanof Islands (USA) : AVO reported that slow lava effusion at Great Sitkin continued during 16-23 August; no changes to the flow margins were visible but the lava had deepened around the vent. Weather clouds often obscured satellite and webcam views during most of the week. Seismicity was low and occasional local earthquakes were recorded.

Kaitoku Seamount – Volcano Islands (Japan) : JMA reported that discolored water around the Kaitoku Seamount was visible during 18-19 August.

Karymsky – Eastern Kamchatka (Russia) : KVERT reported that the eruption at Karymsky continued during 11-18 August. A thermal anomaly over the volcano was identified in satellite images during 12-13, 16, and 18 August.

Kilauea – Hawaiian Islands (USA) : HVO stated that by 16 August about 104 million cubic meters of lava had been erupted from a vent in the lower W wall of at Kilauea’s Halema`uma`u Crater since the current eruption began on 29 September 2021, raising the crater floor by 137 m. Lava continued to effuse from the vent during 17-22 August, entering the lava lake and flowing onto the crater floor. Part of the lake was continuously active. The lake level mostly remained within the bounding levees, though daily breakouts were visible along the margins.

Lewotolok – Lembata Island : PVMBG reported that the Strombolian eruption at Lewotolok continued during 17-23 August. Daily white emissions rose as high as 500 m above the summit and drifted in multiple directions. White-and-gray plumes rose as high as 300 m on 19 August. Photos in some daily reports showed Strombolian activity.

Merapi – Central Java : BPPTKG reported that the eruption at Merapi continued during 12-18 August and seismicity remained at high levels. As many as 23 lava avalanches traveled down the Bebeng drainage on the SW flank, reaching a maximum distance of 1.8 km. Photo analyses showed no changes at the SW and central lava domes.

Nevado del Ruiz – Colombia : Servicio Geológico Colombiano’s (SGC) reported that at 1751 on 18 August an ash emission at Nevado del Ruiz rose 3.2 km and drifted WNW and was associated with a seismic signal indicating fluid movement. The plume was visible on webcams and from Manizales.

Pavlof – Alaska Peninsula, Alaska : AVO reported that a minor eruption at a vent on Pavlof’s upper E flank was ongoing during 16-23 August. There was no evidence of lava effusion, but seismic tremor persisted and multiple small explosions were detected on most days in local seismic, regional seismic, and infrasound data. During 17-18 August explosions produced minor ash emissions that rose to 3 km (10,000 ft) a.s.l. and dissipated quickly, as reported by pilots and seen in webcam images. Daily elevated surface temperatures were identified in satellite images reflecting a hot vent.

Semeru – Eastern Java : PVMBG reported that the eruption at Semeru continued during 16-23 August. Eruptive events recorded at 0544 and 0718 on 22 August produced ash plumes that rose 500 and 300 m above the summit and drifted SW and W, respectively. The Alert Level remained at 3 (on a scale of 1-4). The public was warned to stay at least 5 km away from the summit, and 500 m from Kobokan drainages within 17 km of the summit, along with other drainages originating on Semeru, including the Bang, Kembar, and Sat, due to lahar, avalanche, and pyroclastic flow hazards.

Sheveluch – Central Kamchatka (Russia) : KVERT reported that the ongoing eruption at Sheveluch was characterized by explosions, hot avalanches, and lava-dome extrusion during 11-18 August. A daily thermal anomaly was identified in satellite images.

Suwanosejima – Ryukyu Islands (Japan) : JMA reported that the eruption at Suwanosejima’s Ontake Crater continued during 15-22 August. There were six explosions, producing eruption plumes that rose as high as 900 m above the crater rim and ejecting large blocks 600 m from the vent. Crater incandescence was observed nightly, and volcanic tremor was occasionally recorded.

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