Volcanos

Roundup of Global Volcanic Activity – New Activity for the Week 26 February 2020 – 3 March 2020

Bagana | Bougainville (Papua New Guinea) : Based on satellite and wind model data, the Darwin VAAC reported that during 30 February-2 March ash plumes from Bagana rose to 1.8-2.1 km (6,000-7,000 ft) a.s.l. and drifted SW and N.

Great Sitkin | Andreanof Islands (USA) : AVO reported that seismicity at Great Sitkin had increased during the previous month and by 26 February was above background levels; the Aviation Color Code was raised to Yellow and the Volcano Alert Level was raised to Advisory. No eruptive activity was evident in geophysical or satellite data.

Merapi | Central Java (Indonesia) : BPPTKG reported that at 0522 on 3 March an eruption at Merapi produced an ash plume that rose 6 km above the crater rim and pyroclastic flows that descended the SSE flank less than 2 km. The ash plume drifted mainly NE and caused ashfall within 10 km, particularly in areas to the N including Musuk and Cepogo Boyolali. Video of the event showed incandescent material being ejected above the summit and lightning in the ash cloud. The report noted that there were no clear precursors for the eruption. The Alert Level remained at 2 (on a scale of 1-4), and residents were warned to stay outside of the 3-km exclusion zone.

San Miguel | El Salvador : SNET reported that during 23-28 February activity at San Miguel was low. An increase in the number of very small-magnitude earthquakes was recorded by the VSM seismic station located on the upper N flank. RSAM values were between 45 and 75 units, lower than the normal values of 150.

Semeru | Eastern Java (Indonesia) : PVMBG reported that during February and 1-2 March gray eruptive plumes rose 200-500 m above Semeru’s summit. Beginning on 26 February incandescent material was ejected 10-50 m above the Jonggring-Seloko Crater, and by 2 March lava flows had traveled 500-1,000 m down the Kembar, Bang, and Kobokan drainages (on the S flank). The Alert Level remained at 2 (on a scale of 1-4), and the public was reminded to stay outside of the general 1-km radius from the summit and 4 km on the SSE flank.

Yasur | Vanuatu : Based on webcam images, satellite data, and pilot observations the Wellington VAAC reported that during 2-3 March low-level ash plumes from Yasur rose to an altitude of 1.5 km (5,000 ft) a.s.l. and drifted W and NW.

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