Volcanos

Roundup of Global Volcanic Activity – New Activity for the week 8 December – 14 December 2021

Awu – Sangihe Islands (Indonesia) : PVMBG reported that volcanic seismicity at Awu had increased beginning in October. Notably, the number of shallow volcanic earthquakes increased to 7-26 events per day from the previous maximum of 5 daily events. The number of deep volcanic earthquakes also increased. The Alert Level was raised to 2 (on a scale of 1-4) and the public was warned to stay 1 km away from the summit crater. The report also noted that no emissions nor any other surficial activity had been visible during 1 September-10 December, though weather sometimes hindered views.

Davidof – United States : Earthquake swarms either related to tectonic processes or volcanic unrest were recorded in the vicinity of Davidof during 8-10 December. The largest earthquake was a M 4.2 recorded at 1045 on 10 December. AVO raised the Aviation Color Code to Yellow and the Volcano Alert Level to Advisory due to the possibility of escalating volcanic unrest. Small earthquakes continued to be detected during 11-14 December, though at a lower rate and amplitude. Cloudy or mostly cloudy satellite and webcams views showed no volcanic activity.

Semeru – Eastern Java (Indonesia) : PVMBG reported that lava avalanches from the end of the 700-m-long lava flow on Semeru’s SE flank descended 500 m during 7-8 December. Lava avalanches were detected by the seismic network almost daily during 9-14 December, though weather conditions prevented visual confirmation. During 9-11 December crater incandescence was visible and gray-white ash plumes rose 300-1,000 m above the summit. White plumes rose as high as 1 km above the summit during 12-14 December. According to BNPB, the death toll from the 4 December collapse event rose to 48 by 13 December, 12 people were still missing, 21 were seriously injured, and 9,374 people were in 129 evacuation centers.

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