![]() Incandescence at the summit crater and from lava flows had declined starting in the last week of November. ![]() Similarly, the average number of daily rockfalls and pyroclastic density currents (PDCs, or pyroclastic flows) decreased from monthly averages of 122 to 87 and 5 to 2 events per day, respectively, from October to November there were almost zero events per day in the first week of December. Volcanic earthquakes indicating lava extrusion, degassing, and occasional fracturing beneath the edifice decreased from an average of 11 events per day in November to almost zero events per day in the first week of December. PHIVOLCS lowered the Alert Level for Mayon to 2 (on a 0-5 scale) at 0800 on 8 December due to a continuing decline in activity during the previous several weeks. The Alert Level remained at 3 (on a scale of 1-4), and the public was warned to stay 3-7 km away from the summit, based on location. Seismicity remained at high levels during the week. BPPTKG noted that minor morphological changes to the SW lava dome were identified in webcam images due to continuing lava effusion and collapses of material. Ash mixed with rain fell in Krinjing (5 km WNW) and Paten (9 km WNW) villages, Dukun District in the Magelang Regency, as well as in the Stabelan (4 km NW), Klakah (4 km NW), and Tlogolele (5 km NW) villages in the Selo District, Boyolali Regency. According to BNPB several dark gray pyroclastic flows were detected by the seismic network starting at 1449 on 8 December and traveled as far as 3.5 km down the Krasak drainage on the SW flank. The SW lava dome produced a total of 192 lava avalanches 23 traveled as far as 1.5 km down the Boyong drainage and 169 traveled as far as 1.7 km down the Bebeng drainage. Minor ashfall occurred in the Sawangan District (15 km W), Magelang, and the Selo District (5 km NNE), Boyolali. ![]() Two pyroclastic flows traveled S as far as 1.3 km down the upper part of the Boyong drainage and four pyroclastic flows traveled SW as far as 3 km down the upper parts of the Bebeng and Krasak drainages during 1-7 December. Complete updates are done about every 6-8 weeks, but information about newer eruptions can be found in the Weekly Report.īPPTKG reported that the eruption at Merapi (on Java) continued during 1-8 December. ![]() An eruption listed here might have ended since the last data update, or at the update time a firm end date had not yet been determined due to potential renewed activity. The most recently started eruption is at the top, continuing as of the Last Known Activity date. The Smithsonian / USGS Weekly Volcanic Activity Report (WVAR) for the week ending on 12 December 2023 includes the 22 volcanoes shown below marked "Yes" in the WVAR column (rollover for report). Additional annual eruption data is available for recent years. There are typically 40-50 continuing eruptions, and out of those generally around 20 will be actively erupting on any particular day (though we do not keep detailed statistics on daily activity). An eruption marked as "continuing" does not always mean persistent daily activity, but indicates at least intermittent eruptive events without a break of 3 months or more. Overall, 47 volcanoes were in continuing eruption status as of 15 December 2023.
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