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Volcanic activity world-wide 7 Aug 2012: Tongariro, Etna, Stromboli, Popocatépetl, volcanoes in Guatemala, Colombia, Ecuador

Tue, 7 Aug 2012, 10:28
10:28 AM | BY: T
Strombolian eruption from Etna's Bocca Nuova on 5 Aug
Strombolian eruption from Etna's Bocca Nuova on 5 Aug
News have been dominated by Tongariro volcano's first eruption in 115 years (New Zealand). At the moment, the volcano is quiet, but eruptions could resume any time.

Etna (Italy): Strombolian activity continues at varying levels. Following a phase of weak activity during 4-6 Aug, an increase of activity was observed at the Bocca Nuova during the night 6-7 Aug.
Also in Italy, the activity at Stromboli (Eolian Islands) has been at relatively high levels over the past days. The number and size of explosions from the summit vents has increased.

Popocatépetl in Mexico: About 1 explosion occurs per hour, and strong glow is visible at night. A relatively powerful eruption late on 6 Aug sent ash to up to 30,000 ft (10 km) altitude.

The volcanoes in Guatemala have shown little changes in activity over the past days.
Fuego volcano has intermittent weak strombolian explosions throwing lava up to 100 m above the crater, and the lava flow on the south flank is still active.
Santiaguito / Santa Maria (Guatemala): Weak to moderate explosions occur regularly and produce ash plumes up to 900 meters high. Avalanches of lava blocks descend on the south flank of the dome.
Lots of seismic activity is visible on the seismograms, most of it related to rockfalls.
Some tremor and shallow volcanic quakes and weak degassing are the only signs of activity reported from Pacaya.

In Colombia, there are currently 1 volcanoes on orange alert (Ruiz)(eruption warning) and 4 on yellow (unrest):
Nevado del Ruiz (Colombia) shows tremor, associated with gas and minor ash emissions at low level. A shallow M1.2 earthquake occurred at 3:11 (local time) near the Arenas crater. INGEOMINAS keeps a close watch of the volcano.
Compared to the previous week, the seismicity at Galeras has increased and shows events related to fluid movements within the volcano. Few weak earthquakes with magnitudes less than 1.1 related to fracturing of rock occurred at shallow depths (less than 4 km) at various locations under the volcano.
Seismicity at Cerro Machin volcano remains at slightly elevated levels with some weak earthquakes SE under the lava dome at depths between 3.5 and 5 km.
At Cumbal volcano, seismicity is still above background levels, but has has decreased. Signals are interpreted as fluid movements under the volcano.
Nevado del Huila The volcano shows normal seismic activity and degassing at low levels with no significant changes to previous weeks. INGEOMINAS keeps the alert level at yellow.

Tungurahua volcano: Activity remains generally at relatively low levels. Few small to moderate explosions (about 3-5 per day) and weak steam and ash venting continue at Tungurahua. The last reported ash cloud altitude was at 18,000 ft (4.5 km) from an explosion on 6 Aug.
This morning, a more intense phase with volcanic tremor is visible on the seismograms.
Reventador volcano: IG reports a strong steam plume rising 1500 m above the summit, but does no more mention any active lava flow.
Sangay volcano: No recent reports of eruptions from remote Sangay are available, but this might simply incidate that its typical strombolian eruptions are too small.

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