Volcanos

Roundup of Global Volcanic Activity – Ongoing Activity for the week 15 June – 21 June 2022

Bezymianny – Central Kamchatka (Russia) : KVERT reported that eruptive activity at Bezymianny that continued during 10-17 June was characterized by strong fumarolic emissions, lava-dome incandescence, and hot avalanches. A daily thermal anomaly was also identified in satellite images.

Chiles-Cerro Negro – Colombia-Ecuador : Recent increased seismicity began in May. Earthquakes were first felt on 12 June by residents near the border of Colombia and Ecuador, in the indigenous reservations of Chiles, Panán, and Mayasquer (Colombia), and in Tufiño (Ecuador). Seismicity continued, and from 0205 on 12 June to 0832 on 14 June there were 260 events clustered in two zones, in the S part of CCNVC (at depths of less than 6 km below the CCNVC summit) and about 9 km SE beneath Caldera de Potrerillos (at depths of 7-9 km). The earthquake swarm activity was similar to other swarms recorded since 2013. A trend of inflation at a rate of approximately 28 mm/year has been recorded since 2016 (the beginning of deformation monitoring) through the end of 2020, when the deformation stabilized. Neither inflation nor deflation was detected during the beginning of 2020 or in 2021. Inflation was again detected in March and was continuing at a rate of 32 mm/year. Data from hydrothermal sites around CCNVC showed variations from previous measurements in gas data, and conductivity, temperature, pH, and morphology of a few of the hot spring locations, though they were a result of changes to the hydrothermal systems and not increased volcanic activity.

Cleveland – Chuginadak Island (USA) : AVO reported that during 15-21 June elevated surface temperatures over Cleveland were sometimes identified in satellite images, reflecting the continuing emissions of hot gases. Weather clouds sometimes prevented views of the volcano. Crater subsidence in the summit crater was detected during the previous several weeks. Sulfur dioxide emissions were detected on 15 and 21 June.

Dukono – Halmahera : Based on satellite and wind model data, the Darwin VAAC reported that during 16-21 June ash plumes from Dukono rose to 2.1 km (7,000 ft) a.s.l. and drifted NW and W.

Etna – Sicily (Italy) : INGV reported that during 13-19 June gas emissions rose from Etna’s Southeast Crater (SEC) and Bocca Nuova Crater (BN); the emissions from BN were dense and voluminous on 13 June and drifted SSW. Lava effusion from the vent located at about 2,700 m elevation, along the fissure that had opened on 29 May, had slowed by 13 June and stopped by that evening. Lava continued to erupt from a vent along the 7 June fissure, located at the base of the N wall of the Valle del Bove, advancing to 1,760 m elevation by 14 June. Effusion ceased overnight during 15-16 June.

Great Sitkin – Andreanof Islands (USA) : AVO reported that the eruption at Great Sitkin continued during 8-14 June. Elevated surface temperatures were identified in satellite data almost daily, consistent with lava effusion; weather clouds sometimes obscured satellite and webcam views. Seismicity was low with several small local earthquakes detected by the seismic network.

Karymsky – Eastern Kamchatka (Russia) : KVERT reported that a thermal anomaly over Karymsky was identified in satellite images during 10-11 and 15-17 June.

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 14-22 June, entering the lava lake and flowing onto the crater floor. The surface of the lava lake was continuously active all week, and nearly continuous breakouts occurred along the margins. The lake level was variable in response to cycles of inflation and deflation. By 17 June the total volume of erupted lava was an estimated 93 million cubic meters, and the lake which had risen a total of 120 m since 29 September 2021.

Krakatau – Sunda Strait : PVMBG reported that several eruptive events at Anak Krakatau were recorded during 15-17 June. Eruptions at 0636, 1337, and 2119 on 15 June, 1241 on 16 June, and 0042 and 1839 on 17 June produced dense gray-to-black ash plumes that rose 300-600 m above the summit and drifted N, SW, and S. A few of the webcam images posted with the reports showed ejected incandescent material.

Lewotolok – Lembata Island : PVMBG reported that the eruption at Lewotolok continued during 14-22 June. An eruptive event at 1501 on 16 June produced a white-to-gray ash plume that rose about 700 m above the summit and drifted W and NW. Another event at 1127 on 17 June generated a dense gray ash plume that rose about 1 km and drifted W.

Merapi – Central Java : BPPTKG reported that the eruption at Merapi continued during 10-16 June. 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 58 lava avalanches traveled down the Bebeng drainage on the SW flank, reaching a maximum distance of 1.8 km. Seismicity remained high.

Pavlof – Alaska Peninsula, Alaska : AVO reported that the eruption at a vent on Pavlof’s upper E flank was ongoing during 14-21 June, and seismic tremor persisted. Daily elevated surface temperatures identified in satellite images were consistent with the continuing effusion of short (500 m or less) lava flows.

Reventador – Ecuador : IG reported that a high level of activity continued at Reventador during 14-22 June, though cloudy weather conditions sometimes prevented visual observations. Gas-and-ash plumes, often observed multiple times a day with the webcam or reported by the Washington VAAC, rose as high as 1.7 km above the summit and drifted mainly NW and W. Incandescence from the crater was often visible at night or during the early morning.

Ruapehu – North Island (New Zealand) : On 20 June GeoNet reported continuing unrest at Ruapehu. Tremor levels had been characterized as weak to moderate for the previous three weeks but increased for a brief period. Levels increased sharply during the evening of 17 June, fluctuated between moderate and strong levels on 18 June, and then decreased to weak levels by 19 June. Lake water temperatures continued to decline, reaching 22 degrees Celsius.

Sangay – Ecuador : IG reported a high level of activity at Sangay during 14-22 June. Daily ash-and-gas plumes were identified in webcam images, and seen in satellite images by the Washington VAAC. Plumes rose as high as 2.4 km above the volcano and drifted W and SW; ashfall was reported in Retén Ichubamba (35 km WNW) and Chauzán San Alfonso (40 km W) during 14-16 June. Almost every day multiple thermal anomalies over the volcano were visible in satellite data. Weather clouds sometimes obscured views of the volcano.

Semisopochnoi – Aleutian Islands (USA) : AVO reported that low-level eruptive activity at Semisopochnoi’s North Cerberus cone continued during 14-21 June. Periods of weak tremor were recorded by the seismic network. Weather clouds often prevented satellite and webcam views; minor steam emissions were visible in one clear webcam image on 17 June.

Sheveluch – Central Kamchatka (Russia) : KVERT reported that a thermal anomaly over Sheveluch was identified in satellite images during 10-17 June and explosions, hot avalanches, and lava-dome extrusion continued. A daily thermal anomaly was identified in satellite images. Webcam images recorded explosions on 10 June that sent ash plumes to 6.5 km (21,300 ft) a.s.l. The ash plumes were visible in satellite images drifting 130 km SE. At 0847 on 20 June (local time) explosions were recorded in webcam images. Ash plumes rose to 7 km (23,000 ft) a.s.l. and drifted 10 km E.

Suwanosejima – Ryukyu Islands (Japan) : JMA reported that the eruption at Suwanosejima’s Ontake Crater continued during 13-20 June. Crater incandescence was visible at night. Emissions rose as high as 1.6 km above the crater rim and material was ejected as far as 300 m from the vent.

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