Volcanos

Roundup of Global Volcanic Activity – New Activity for the Week 2 December 2020 – 8 December 2020

Lewotolo – Lomblen Island (Indonesia) : PVMBG reported that the eruption at Lewotolo continued during 1-8 December. Black-and-gray ash plumes were visible daily, rising as high as 1.5 km abo e the summit. Incandescence at the summit was visible nightly and material was sometimes ejected as high as 20 m above the summit. BNPB noted that by 5 December there were a total of 9,028 people housed in 11 evacuation centers. The Alert Level was remained at 3 (on a scale of 1-4) and the public was warned to stay 4 km away from the summit crater.

Manam – Papua New Guinea : Based on analyses of satellite imagery and model data, the Darwin VAAC reported that on 6 December an ash emission from Manam rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted SW.

Merapi – Central Java (Indonesia) : BPPTKG and PVMBG reported that during 27 November-8 December white emissions from Merapi rose as high as 600 m above the summit. Rock avalanches were heard, though not visually confirmed due to weather conditions. A comparison of photos taken on 26 and 29 November showed no morphology changes in the summit area. Seismicity was higher than the previous week. Electronic Distance Measurement (EDM) data continued to measure a distance shortening between points in the NW at a rate of 11 cm per day. The Alert Level remained at 3 (on a scale of 1-4).

Piton de la Fournaise – Reunion Island (France) : OVPF reported that a seismic crisis at Piton de la Fournaise was recorded during 0510-0554 on 4 December and was accompanied by minor, but rapid, deformation located just below the center and N rim of Dolomieu Crater. Seismicity declined after the crisis but inflation continued through 6 December. A second seismic crisis began at 0228 on 7 December and was again accompanied by rapid deformation. At about 0440 three fissures opened on the WSW flank of Dolomieu Crater at elevations between 2,300 and 2,190 m, spanning a 700-m-long area. Lava began erupting during 0455-0500. An overflight was conducted during 0700-0730; scientists observed lava fountains rising 15 m high from the three fissures and short lava flows. By 1700 the fissure at the highest elevation was the most active with five small vents while the other two fissures were noticeably less active. The eruption phase ended at 0715 on 8 December following a gradual drop in tremor and a three-hour phase of seismic signals indicating degassing. No surficial activity was visible.

Telica – Nicaragua : INETER reported that there were 598 “low energy” ash-and-gas explosions at Telica recorded during 1-3 December, making a total of 775 recorded since the activity began on 30 November. Gas-and-ash plumes rose 50-400 m above the crater rim and mainly drifted SW. Ashfall was reported in areas downwind including in Zarandaj (7 km WSW), Cristo Rey (6 km W), Las Colinas (7 km WSW), Garrobo Empinado (8 km SW), El Panal (9 km SSW), Canta Rana, Ceibo Chachagua (10 km SW), Las Mercedes, Punta Arena (11 km SW), La Virgen, and Filiberto Morales (15 km WSW).

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