Volcanos

Roundup of Global Volcanic Activity:

Pavlov (Alaska Peninsula, USA): The eruption continues. The volcano produces a lava flow on the northwest flank. Interaction of the lava flow and ice, producing debris flows, as well as possible explosions at the vent produce a steam-ash plume rising up to about 20,000 ft. above sea level. Residents of Cold Bay, located 37 miles southwest of the volcano, observed incandescent glow at the summit during the night. (AVO)

Popocatépetl (Central Mexico): Activity remains elevated and ash plumes from frequent explosions of moderate size reach 26,000 ft (8 km) altitude, drifting NE. Ash fall occurred in Paso de Cortés, north of the volcano. This morning, many explosions were observed ejecting incandescent material to maximum distances of 400 m mainly on the north and north-east flanks. Relatively strong explosions occurred last night (at 20:21 h local time 14 May) and this morning at 01:46 h (local time). Both eruptions generated columns of steam and ash rising 3 km and the latter explosion ejected incandescent fragments over all the volcano flanks to maximum distances of 1,500 m. Some episodes of harmonic tremor preceded the explosion at 01:46 h, which was followed by an episode of spasmodic tremor of medium and high amplitudes until 04:40 h.

Santa María / Santiaguito (Guatemala): Only relatively few and weak explosions occurred recently, some of which caused light ash fall in nearby areas. The lava dome is producing a degassing plume most of the time. No reports of activity at the stagnant lava flows.

Pacaya (Guatemala): Strombolian activity has returned or increased and is now ejecting incandescent material to heights of 100 m. Seismic data seem currently not available from INSIVUMEH's website.

Fuego (Guatemala): Explosive activity remains very weak. During the past 24 hour observation interval, INSIVUMEH only counted 3 small explosions.

Nevado del Huila (Colombia): The large volcano has remained calm with little variations in activity (degassing, 100-150 small earthquakes / week).

Machin (Colombia): No changes have occurred - the only signs of activity are small earthquakes, mostly related to rock fracturing inside the volcano SE of the main dome. The alert status remains at yellow.

Galeras (Colombia): Internal / external activity has been low with weak earthquake activity (although at somewhat increasing tendency) and steaming observed. Pasto reports low values of SO2 emissions.

Nevado del Ruiz (Colombia): Seismic (tremor, volcanic-tectonic quakes) and external activity (steaming, occasional weak ash venting) have calmed down a bit over the past days.

Cumbal (Colombia): Pasto volcano observatory reports no significant changes and maintains yellow (unrest) alert level. The only sign of activity is continuing slightly elevated seismicity (up to magnitudes 1) at shallow depths (less than 3 km) under La Plazuela crater on the northern flank of the volcanic complex.

Sotará (Colombia): Weak seismic unrest continued over the past weeks. The alert level remains at yellow.

Tungurahua (Ecuador): The volcano has calmed down a bit compared to the previous week, which is also apparent on recent seismograms. No recent explosions or ash falls were reported.

Sabancaya (Peru): Seismic activity has calmed down a bit compared to the previous weeks.