Global Volcanic Activity – New Activity for the week of 30 January-5 February 2019

Barren Island | Andaman Islands (India) – Based on analysis of satellite imagery and wind data, the Darwin VAAC reported that on 26 January ash plumes from Barren Island rose to an altitude of 0.9 km (3,000 ft) a.s.l. and drifted W.

Karangetang | Siau Island (Indonesia) – PVMBG reported that the current eruption at Karangetang began with increased seismicity and thermal anomalies in November 2018. Since then activity was dominated by lava-dome growth, avalanches, and pyroclastic flows. A gray ash plume rose above the summit craters on 30 January. By 2 February ’a’a lava from Kawah Dua (North Crater) had traveled 2.5 km NNW down the Melebuhe River drainage, prompting the evacuation of eight families (about 21 people). A section of the local road was closed, from W of the Batuare River to Kali Melebuhe. According to a news article the flow was 50 m thick in some areas. Seismic signals indicating avalanches sharply increased on 3 February. Lava and pyroclastic flows originated from the Kawah Dua crater, traveling as far as 1 km W down the Sumpihi River drainage, 2 km NW down the Batuare River, and 2.9 km NW down the Malebuhe drainage. BNPB reported that 112 residents (from Niambangeng, Kampung Beba, and Batubulan villages) had evacuated by 1730 on 4 February, and according to a news article the lava crossed the highway at 1800. The lava flow continued to progress and reached the ocean during 5-6 February.

Merapi | Central Java (Indonesia) – PVMBG reported that during 25-31 January the volume of the lava dome in Merapi’s summit crater was 461,000 cubic meters, relatively unchanged from the previous week. During 0000-2000 on 29 January as many as nine incandescent rockfall events were recorded, with material traveling 200-700 m SE in the Gendol River drainage. Three pyroclastic flows, recorded at 2017, 2053, and 2141, traveled 1.1-1.4 km down the Gendol drainage, and produced minor ashfall in areas E including Boyolali (17 km E), Mriyan (5 km E), and Mojosongo (44 km E). The Alert Level remained at 2 (on a scale of 1-4), and residents were warned to remain outside of the 3-km exclusion zone.

Planchon-Peteroa | Central Chile-Argentina border – Observatorio Volcanológico de los Andes del Sur (OVDAS)-SERNAGEOMIN and ONEMI reported an increase in ash emissions at Planchón-Peteroa beginning at 1700 on 1 February, with ash plumes rising as high as 2 km and drifting E. This activity was accompanied by the appearance of discrete, very-low-frequency seismic events which were only recorded that day. On 3 February webcams showed gas-and-ash plumes rising to heights less than 2 km. The Alert Level remained at Yellow (the middle level on a three-colour scale) for the volcano, and ONEMI maintained Alert Level Yellow for the communities of Molina (66 WNW), Curicó (68 km NW), Romeral (75 km NW), and Teno (68 km NW).

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