Volcanoes Today, 7 Feb 2013 - recent updates on world-wide volcanic activity

Source: Volcano Discovery - 2/07/13

Campi Flegrei (Phlegrean Fields) (Italy): (6 Feb) A new fumarole vent has been detected recently in the Campi Flegrei in the hydrothermal field of Pisciarelli. The new vent was seen ejecting hot gas as well as geyser-like fountains of water reaching 4-5 meters of height. This will inevitably trigger headlines in the press about the possibility of a volcanic eruption in the area, however, it should be looked at in a context that such phenomena are a normal part of the behavior of (very) active hydrothermal systems such as the Campi Flegrei have.
Since 2006, the maximum temperatures at the Pisciarelli fumaroles have climbed to peak in July 2012, and then oscillated at values near water boiling point.
Judging from temperature readings, the Vesuvius Observatory believes that the new vent opened on 23 Jan, when gas temperatures from nearby fumaroles suddenly climbed to values of 98 deg C and then steeply dropped to values oscillating between 75-80°C was recorded.
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Rabaul (Tavurvur) (New Britain, Papua New Guinea): Small to medium-sized ash eruptions from Tavurvur continue. VAAC Darwin detected ash plumes this morning rising to 8,000 ft (2.5 km) altitude and maintains aviation alert code orange.

Paluweh (off Flores Island, Indonesia): (6 Feb) It seems that activity has decreased since the large explosion on Sunday. It also appears likely that it had been triggered by a partial dome collapse followed by an explosion and more dome collapse events could follow.

Dukono (Halmahera): (6 Feb) Increased activity has generated a SO2 plume visible on today's NOAA satellite data.

Cleveland (Aleutian Islands, Alaska): After finding evidence of a new lava dome growing in the summit crater, AVO raised the alert level of Cleveland back to orange.
The decision was based on satellite obtained on 30 Jan that indicate that a lava dome has grown in the summit crater.
As of January 30 the dome was about 100 m in diameter and may have begun forming as early as January 24 when elevated surface temperatures were observed in satellite images. The size and shape of the dome appears to be unchanged through February 2 according to the most recently available satellite data. AVO has received no reports of activity or ash emissions since elevated surface temperatures were first observed around the 24th of January.
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Colima (Western Mexico): (6 Feb) Small explosion and rockfall signals have become more frequent over the past days.

Popocatépetl (Central Mexico): Gas emissions (SO2) remain high, while the rate of emissions has decreased again to less than 1 per hour.

Santa María / Santiaguito (Guatemala): Explosive activity continued to pick up a bit again.
INSIVUMEH reported 2 weak and one moderate ash explosion from the dome during an hour in the morning of yesterday, with ash plumes rising up to about 600 m. Ash fall occurred in the areas of Finca El Faro and parts of Monte Claro.
The lava flow on the southeast side of the doe was active and generated weak avalanches.

San Cristobal (Nicaragua): Surface activity and tremor remain low, but there has been an increase in small volcanic quakes.

Machin (Colombia): The volcano continues to show seismic activity above background, mainly in the form of frequent tiny volcanic earthquakes.

Nevado del Ruiz (Colombia): Degassing and sometimes very weak occasional ash venting continue from the volcano. Seismic activity has decreased a bit over the past days, and consists mainly in low-energy tremors related to internal fluid movements under the Arenas crater and to the SE of it.