KVERT reported that explosive activity at Karymsky began at 1850 local time on 20 June based on satellite data. The explosions generated ash plumes that rose 5.5-6 km (18,000-19,700 ft) a.s.l., forming an ash cloud that was 16 x 23 km in size, and drifted SSW. A thermal anomaly was identified in satellite images. The Aviation Color Code was raised to Orange (the second highest level on a four-color scale). By 1222 local time on 21 June the ash plume had drifted 540 km S and SE. Explosions produced ash plumes identified in satellite images at 1747 local time that rose 5.3-5.5 km (17,400-18,000 ft) a.s.l. and drifted 30 km WSW. At 1149 local time on 22 June explosions sent ash plumes to 3 km (10,000 ft) a.s.l. that drifted 30 km W based on satellite data. The previous eruption at Karymsky occurred during 3 April 2021-22 August 2022. Dates are based on UTC times; specific events are in local time where noted.

Geological Summary. Karymsky, the most active volcano of Kamchatka's eastern volcanic zone, is a symmetrical stratovolcano constructed within a 5-km-wide caldera that formed during the early Holocene. The caldera cuts the south side of the Pleistocene Dvor volcano and is located outside the north margin of the large mid-Pleistocene Polovinka caldera, which contains the smaller Akademia Nauk and Odnoboky calderas. Most seismicity preceding Karymsky eruptions originated beneath Akademia Nauk caldera, located immediately south. The caldera enclosing Karymsky formed about 7600-7700 radiocarbon years ago; construction of the stratovolcano began about 2000 years later. The latest eruptive period began about 500 years ago, following a 2300-year quiescence. Much of the cone is mantled by lava flows less than 200 years old. Historical eruptions have been vulcanian or vulcanian-strombolian with moderate explosive activity and occasional lava flows from the summit crater.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)