Nevados de Chillan volcano (Chile) - Smithsonian / USGS Weekly Volcanic Activity Report for 6 October-12 October 2021 (Continuing Activity)
SERNAGEOMIN reported continuing explosive and effusive activity at Nevados de Chillán's Nicanor Crater during 16-30 September though weather conditions often prevented visual confirmation. Explosions generated plumes with low ash content that rose as high as 1.1 km above the crater rim. A new lava dome (Dome 3) in the crater was first identified on 15 September and was 27 x 40 m, elongated NW-SE, and 990 square meters in area.
Mi, 6. Okt 2021, 06:0006:00 AM | VON: VN
The dome formation was preceded by a decrease in the extrusion rates and temperatures of the L5 and L6 lava flows. By 24 September growth at Dome 3 reached 36 x 43 m and covered 2,137 square meters. Dome 4 was first visible on 29 September, adjacent to Dome 3 on the NE side, and produced a new lava flow (L7) that traveled 50 m down the flank between the L5 and L6 flows.
The L5 lava flow also began to advance.
On 5 October the L5 and L7 lava flows advanced and nighttime incandescence from both flows increased. Incandescence from the crater was visible in webcam images at night during 8-9 October. On 9 October a long-period earthquake was recorded at 0706 on 9 October; an associated emission rose more than 240 m above the vent and drifted NW.
The Alert Level remained at Yellow, the second lowest level on a four-color scale. ONEMI stated that Alert Level Yellow (the middle level on a three-color scale) remained in place for the communities of Pinto and Coihueco, noting that the public should stay at least 2 km away from the crater.
Sources: Servicio Nacional de Geología y Minería (SERNAGEOMIN), Oficina Nacional de Emergencia-Ministerio del Interior (ONEMI)
From: Global Volcanism Program, 2021. Report on Nevados de Chillan. In: Mayberry, G (ed.), Weekly Volcanic Activity Report 6 October-12 October 2021. Smithsonian Institution and US Geological Survey.
Mi, 29. Sep 2021, 23:10
The extrusive activity of the volcano continues. ... Read all
Fr, 17. Sep 2021, 04:07
A high-resolution satellite image from 15 September confirmed a new lava dome, the SERNAGEOMIN reported. The actively growing area is located at the Nicanor crater of the volcano. ... Read all