Volcanos

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

Batu Tara – Komba Island : PVMBG issued VONAs noting recent increased gas emissions at Batu Tara but no confirmed eruptions. Ground-based observers reported that at 1453 and 1617 on 28 April gas emissions rose 1-1.2 km above the summit and drifted W. At 0054 on 2 May gas emissions rose 500 m and drifted W.

Gaua – Banks Islands (Vanuatu) : On 28 April the Vanuatu Meteorology and Geo-Hazards Department (VMGD) reported ongoing steam-and-gas emissions from Gaua’s Mt. Garet, and warned visitors that they may notice a sulfur odor near the cone. On 3 May local villages, especially in Naveto in the NE part of the island, heard a loud explosion and then saw a dense ash plume rising from Mt. Garet during 0900-0930.

Karymsky – Eastern Kamchatka (Russia) : KVERT reported that a thermal anomaly over Karymsky was visible in satellite images on most days during 22-29 April. Explosions during 21-22 April produced ash plumes that rose as high as 5 km (16,400 ft) a.s.l. and drifted around 95 km E and SE. Explosions at 1410 on 28 April, local time, generated an ash plume that rose to 10 km (32,800 ft) a.s.l., was about 5 x 7 km at it’s top, and drifted WNW. The Aviation Color Code was raised to Red (the highest level on a four-color scale). By 1550 the ash cloud had spread to 28 x 34 km in size and had drifted almost 290 km WNW at an altitude of 9 km.

Krakatau – Sunda Strait : PVMBG reported that only white gas plumes rose above Anak Krakatau during 27 April-4 May. Satellite images acquired on 27 April and 2 May showed incandescent lava flows in and around the crater and advancing into the sea.

Ruapehu – North Island (New Zealand) : On 2 May GeoNet reported that elevated unrest at Ruapehu continued during the previous week, consisting of lake water heating, volcanic gas output, and strong volcanic tremor. Variable tremor levels were characterized by bursts of strong tremor and short periods of weaker tremor. The lake water temperature had risen to 38 degrees Celsius. During an overflight scientists observed reduced upwelling in the lake over the Northern vents and additional upwelling over the main Central Vent, indicating that it was at least partially unblocked. A sulfur dioxide flux of 390 tonnes per day was measured during a flight on 28 April, the sixth highest amount since 2003. The sustained carbon dioxide and sulfur gas emissions, along with high tremor levels, continue to indicate that magma is driving this period of heightened unrest. At around 0945 on 3 May a steam plume was visible slowly rising as high as 1.5 km above the crater rim; it dissipated by 1030. The plume was not accompanied by seismic or acoustic signals, and weather conditions favored cloud formation. Scientists on an overflight that afternoon observed active upwelling and a slightly higher lake level, similar to observations the previous day. The lake temperature had risen to 39 degrees Celsius. Results from lake water chemistry analysis showed no indication that magma was interacting with the hydrothermal system beneath the lake.

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