Volcanos

Roundup of Global Volcanic Activity - New Activity for the week 14 December - 20 December 2022

Ahyi - Mariana Islands (USA) : Unrest continued to be detected at Ahyi Seamount during 14-20 December. Wake Island hydrophone sensors detected daily signals consistent with explosions. A possible underwater plume was observed in satellite images on 18 December, and definite but diffuse plumes were visible to the SSE of the vent during 19-20 December.

Cotopaxi - Ecuador : IG reported that the low-level eruption at Cotopaxi continued during 14-20 December, characterized by daily steam-and-gas emissions with low ash content. At 0626 on 14 December an ash emission rose 500 m above the crater rim and drifted W, causing ashfall within Parque Nacional Cotopaxi. Weather clouds sometimes obscured views of the volcano; between weather clouds during 14-16 December steam-and gas plumes with low ash content were seen rising as high as 500 m above the crater rim and drifting W. Several emissions with low or very low ash content rose as high as 800 m above the crater rim and drifted W and SW during 16-17 December; similar emissions rose as high as 1.1 km above the crater rim and drifted W and SW during 18-20 December based on webcam views and Washington VAAC notices. Ashfall was reported in San Pedro de Taboada (40 km N), Uyumbicho (30 km NNW), Güitig Alta, Güitig Baja, Conocoto (42 km N), Sur de Quito, Chimbacalle (48 km NNW), La Magdalena (48 km NNW), Barrio Nuevo, Villaflora (48 km NNW), Miraflores, and La Floresta (50 km N) during 19-20 December.

Etna - Sicily (Italy) : INGV reported that the vents at the NE base of Etna’s SE Crater, in the Valle del Leone, continued to feed lava flows during 7-18 December. The active flow field consisted of a main lava flow and several breakouts that fed smaller lava flows. A small hornito formed at the vent area and ejected pieces of lava.

Klyuchevskoy - Central Kamchatka (Russia) : KVERT reported that the explosive Strombolian eruption at Klyuchevskoy that began on 16 November had decreased. The Kamchatka Branch of Geophysical Services (KBGS; Russian Academy of Sciences) noted that possible ash plumes rose as high as 150 m above the summit on 1 December. KVERT began to characterize the activity as moderate on 6 December and noted that the periodic thermal anomalies identified in satellite images had become weak on 9 December.

Lascar - Northern Chile : SERNAGEOMIN reported that seismic signals characterized as moderate were recorded on 19 December and located near Láscar’s main crater at shallow depths. The seismicity was the most notable recorded since the eruption on 10 December. The Alert Level remained at Yellow (the second lowest level on a four-color scale) and the public were warned to stay at least 5 km away from the crater.

Semeru - Eastern Java : PVMBG reported that the eruption at Semeru continued during 16-20 December. At 0455 on 16 December an eruptive event produced a dense white, gray, and brown plume that rose 1 km above the summit and drifted N. At 0500 on 18 December a dense gray ash plume rose 300 m and drifted N and NE. At 0623 and 0755 that same day dense white-and-gray ash plumes rose 1 km and 700 m, respectively, and drifted N. At 0516 and 0703 on 19 December white-and-gray ash plumes rose 400-700 m and drifted N and NE. At 1558 a dense gray-to-brown ash plume rose 1.5 km and drifted N and NE. At 0545 on 20 December an ash plume rose 600 m and drifted N.