Volcanos

Roundup of Global Volcanic Activity – Ongoing Activity for the week of 30 November-6 December 2016

Turrialba | Costa Rica : OVSICORI-UNA reported that at 1130 on 6 December an event at Turrialba generated a diffuse ash plume that rose 400 m above the crater and drifted W

Sinabung | Indonesia : Based on satellite images, wind data, and the Jakarta MWO, the Darwin VAAC reported that on 30 November an ash plume from Sinabung rose to an altitude of 4.2 km (14,000 ft) a.s.l. and drifted SE. The report noted that the eruption had ceased and that the ash plume was expected to dissipate in the next hours.

Sheveluch | Central Kamchatka (Russia) : KVERT reported that during 25 November-2 December lava-dome extrusion onto Sheveluch’s N flank was accompanied by strong fumarolic activity, dome incandescence, ash explosions, and hot avalanches. Satellite images showed a daily thermal anomaly over the dome and ash plumes drifting 375 km SE and S on 26 November and 1 December. The Aviation Color Code remained at Orange.

Reventador | Ecuador : During 30 November-6 December IG reported a high level of seismic activity including explosions, long-period earthquakes, harmonic tremor, and signals indicating emissions at Reventador; cloud cover sometimes prevented visual observations. Incandescent blocks were observed rolling as far as 1.6 km down the flanks. Gas, water vapor, and ash plumes were observed on most days rising as high as 1.5 km and drifted SW, W, NW, and NE.

Colima (Western Mexico): The activity of the volcano is picking up: in particular, explosions have become more frequent and gradually larger in size. While the active lava flow continues to creep down the southern flank along with incandescent rockfalls, alimented by the growing lava dome in the summit crater, vulcanian-type explosions of small to moderate size occur at rates of 1-3 per hour, producing ash plumes that rise up to approx. 3000 m and throw out many incandescent blocks onto the upper flanks of the volcano.

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