Volcanos

Roundup of Global Volcanic Activity – Ongoing Activity for the week of 1 February-7 February 2017

Bogoslof | Fox Islands (USA) : AVO reported that no further emissions were detected at Bogoslof after an explosion at 0520 on 31 January; the Aviation Color Code (ACC) was lowered to Orange and the Volcano Alert Level (VAL) was lowered to Watch the next day. A burst of tremor lasting nine minutes was detected starting at 0457 on 3 February. A second burst, starting at 0533 and lasting 20 minutes, was also detected by infrasound instruments, indicating an explosion. No ash cloud was detected above the meteorological cloud deck in satellite data. An event that began at 1642 produced a small volcanic plume that drifted about 40 km N below an altitude of 7.6 km (25,000 ft) a.s.l. Seismic tremor significantly decreased later that evening. Weakly elevated surface temperatures were observed in two satellite images acquired on 5 February, possibly related to hot deposits from explosive activity the day before.

Colima | Mexico : The Washington VAAC reported that on 1 February an ash emission was recorded by the webcam rising from Colima. Weather clouds prevented satellite observations of the event. Based on webcam and satellite images, the Mexico City MWO, and model data, the VAAC noted that during 3-6 February ash plumes rose to altitudes of 5.2-7.6 km (17,000-25,000 ft) a.s.l. and drifted NW, W, SW, and S.

Dukono | Halmahera (Indonesia) : Based on analyses of satellite imagery and model data, the Darwin VAAC reported that during 1-2 and 5-7 February ash plumes from Dukono rose to altitudes of 1.8-2.1 km (6,000-7,000 ft) a.s.l. and drifted at least 130 km SE and E.

Ebeko | Paramushir Island (Russia) : KVERT reported that moderate gas-and-steam emissions possibly containing small amounts of ash continued at Ebeko during 27 January-3 February. Minor ashfall was reported in Severo-Kurilsk (Paramushir Island) about 7 km E on 30 January. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).

Fuego | Guatemala : In a special report from 2 February, INSIVUMEH noted increased activity at Fuego characterized by explosions occurring every 5-15 minutes. Ash plumes rose as high as 750 m and drifted 15 km W, causing ashfall in areas downwind including Sangre de Cristo and San Pedro Yepocapa. During 2-7 February explosions generated ash plumes that rose 0.4-1.1 km above the crater and drifted at most 12 km NW, W, SW, and S. Incandescent material was ejected 150 m high, and avalanches traveled down the Taniluyá (SW) and Ceniza (SSW) drainages. Ashfall was reported in areas downwind including Sangre de Cristo (8 km WSW), Santa Sofía (12 km SW), El Porvenir (8 km ENE), Rochela, and Panimaché I and II (8 km SW). Shock waves from explosions rattled nearby structures.

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