Volcanos

Roundup of Global Volcanic Activity – Ongoing Activity for the week of 8 February-14 February 2017

Bogoslof | Fox Islands (USA) : AVO reported that during 8-12 and 14 February cloud cover prevented satellite views of Bogoslof; no other data indicated eruptive activity. At 0724 on 13 February seismicity significantly increased, prompting AVO to raise the Aviation Colour Code (ACC) to Red and the Volcano Alert Level (VAL) to Warning. Satellite images acquired through 0930 showed no ash emissions above the 3 km (10,000 ft) a.s.l. cloud deck, and no lightning was detected. AVO concluded that, despite the intensity of seismic activity, a significant ash emission was not produced during this event; the ACC was lowered to Orange and the VAL was lowered to Watch.

Colima | Mexico : The Universidad de Colima reported that a large explosion at Colima was recorded at 1732 on 3 February, generating an ash plume that rose 6 km above the crater rim and drifted SSW. A small pyroclastic flow traveled down the E flank. The report stated that the internal crater is about 250 m in diameter and 50-60 m deep; previous lava domes had been destroyed in late September and mid-November 2016. On 9 February the sulphur dioxide gas flux was low (19 tons/day). Based on webcam and satellite images, the Washington VAAC reported that on 11 February an ash plume rose to an altitude of 4 km (13,000 ft) a.s.l. and drifted W. On 14 February an ash plume rose to an altitude of 5.2 km (17,000 ft) a.s.l. and drifted NE.

Dukono | Halmahera (Indonesia) : Based on analyses of satellite imagery and model data, the Darwin VAAC reported that during 8-14 February ash plumes from Dukono rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted S, SE, and E

Ebeko | Paramushir Island (Russia) : On 10 February KVERT reported that activity at Ebeko had declined, though gas-and-steam emissions continued. The Aviation Colour Code was lowered to Yellow (the second lowest level on a four-colour scale).

Kilauea | Hawaiian Islands (USA) : During 8-14 February HVO reported that the lava lake continued to rise and fall, circulate, and spatter in Kilauea’s Overlook vent. Webcams recorded incandescence from long-active sources within Pu’u ‘O’o Crater and from a vent high on the NE flank of the cone. All surface flows were active within 2.4 km of Pu’u ‘O’o. The 61G lava flow, originating from a vent on Pu’u ‘O’o Crater’s E flank, continued to enter the ocean at Kamokuna. A portion of the sea cliff just W of the ocean entry collapsed on 11 February.

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