Volcanos

Roundup of Global Volcanic Activity:

Etna (Sicily, Italy): After a day with ash emissions from New SE crater and occasionally from Bocca Nuova, another eruptive episode with strong strombolian activity occurred over night from both the New SE crater and Bocca Nuova. This is the 8th eruptive episode during 2013, but the first when both the New SE crater and Bocca Nuova were active at the same time.

White Island (New Zealand): Strong steaming from the crater floor is visible, accompanied by again increased tremor with many interspersed earthquakes today.

Iliamna (Cook Inlet (SW Alaska)): A swarm of earthquakes has started yesterday near Iliamna volcano. This morning, a 3.7 quake occurred about 30 km to the east, the strongest event in this new pulse of seismic activity so far. The volcano had just been set back to status level "normal" by AVO almost a month ago, after the seismic unrest in 2012 had gradually declined over the past month. So far, AVO has not changed the alert status again.

Colima (Western Mexico): Small explosions, rockfalls, short pulses of tremor and occasional volcanic earthquakes continue. New lava is slowly accumulating inside the new crater left by the large explosion on Tuesday. The explosion had destroyed the older lava dome that had been slowly growing within and in places over-topped the summit crater since the late 1990s.

Popocatépetl (Central Mexico): Activity has remained stable. Glow from the summit indicates slow supply of magma to the lava dome. The rate of emissions has climbed a bit to almost 2 per hour average.

Santa María / Santiaguito (Guatemala): (1 Feb) The eruption remains relatively weak and mainly effusive, with the slow extrusion of lava flows descending the flanks of the dome and producing small to moderate avalanches. Ash generated by this process is currently blown mainly towards the south where light ash fall occurs, namely in Lotificación las Marías and areas near San Felipe Reu.

Fuego (Guatemala): (1 Feb) The effusion rate has again increased today. The old lava flow headed towards the Taniluyá canyon gained strength again and increased to 200 m length and a new flow started to flow towards the Ceniza drainage and reached 150 m length this morning. There were 9 weak explosions during the past 24 hours, generating light gray ash plumes rising up to 400 m and drifting up to 8 km to the west and southwest.

San Cristobal (Nicaragua): Intermittent phases of continuous volcanic tremor have started to appear at the volcano. There are no reports of new activity at the surface.

Machin (Colombia): A period of markedly increased seismic activity occurred over night.

Nevado del Ruiz (Colombia): Strong gas emissions are visible on the latest NOAA SO2 image for the region. Seismic activity has been low, but small volcanic quakes continue to occur.

Reventador (Ecuador): The activity of the volcano remains strong. The new summit lava dome continues to grow and produce explosions and feed active lava flows on the upper flank. During the afternoon of 31 Jan, an strong emission column of steam and moderate ash content could be observed rising 3.5 km above the crater.

Tungurahua (Ecuador): A steam column rose about 100 m during the afternoon of 31 Jan. Seismic activity remains at moderate levels, with a tendency of a slow increase. During 1 Feb, IG counted 40 long-period and one volcanic-tectonic quake.

Copahue (Chile/Argentina border): Seismic activity has decreased and no new surface activity observed. During the past 24 hours since last night, SERNAGEOMIN only detected one tiny volcanic earthquake.

Kamchatka: No notable changes have occurred in activity at any of the Kamchatkan volcanoes. Accompanied by high tremor (but slightly lower than during the previous weeks), fluid lava continues to be erupted from Plosky Tolbachik volcano. Moderate seismicity accompanies the lava extrusion at Sheveluchand Kizimen volcanoes. Low seismicity accompanies occasional explosive (strombolian to vulcanian) activity at Karymski volcano. Loud volcanic tremor from Tolbachik masks seismicity that is likely taking place in-conjunction with lava extrusion at Bezymianny volcano and strombolian activity at the summit of Klyuchevskoi volcano. Gorely volcano continues to exhibit moderate hydrothermal tremor and volcanic earthquakes in-conjunction with strong degassing.