Increased degassing appears to have occurred yesterday. A weak SO2 plume is visible on yesterday's NOAA satellite image, and the seismic signal shows a phase of weakly increased tremor.

An SO2 plume from either Turrialba or Poás volcano is visible on today's satellite data, suggesting increased degassing activity at one of the volcanoes.

A relatively strong SO2 cloud was detected over the volcano today, suggesting increased degassing.

An SO2 plume can be seen from Turrialba volcano on yesterday's NOOA image, suggesting increased activity.

An SO2 plume possibly from Turrialba volcano could be seen on yesterday's NOAA SO2 monitoring image for Central America.

Turrialba had a small phreatic explosion following an increase of seismic and degassing activity.

Une récente visite nocturne au volcan cratère ouest de Turrialba a révélé plusieurs spots à incandescence : vent du SW (Boca 2010), vent N (Boca 2011) et le vent SE (Boca 2012) montrent différentielles sorties de gaz et de vapeur, tout en montrant des niveaux différents d'incandescence. Celui de ce dernier (ouvert le 12 janvier) enregistre des températures supérieures centrale. ...plus

A new small ash eruption occurred today (19 Jan 2012), recorded along with an increase in seismicity. The eruption lasted about 20 minutes.

The Observatory Simológico Volcano of Costa Rica (OVSICORI-UNA) confirmed that a new ash eruption occurred at Turrialba volcano in the afternoon around 15h20 on 12 Jan. ...plus [lire toutes]

Turrialba volcano (Costa Rica) opened a new vent on 12 January 2012 as the result of an overpressure on the southeast flank of the West Crater. ...plus [lire toutes]

OVSICORI reports that incandescence was observed at Turrialba for the first time. This ...plus

A sudden increase of gas emission from the new vent in Turrialba's crater since the morning of 20 Jan prompted the authorities to suspend agricultural activities in the immediate areas around the volcano. ...plus [lire toutes]

Turrialba volcano started erupting ash from one of tis summit craters on the morning of 4 January. ...plus [lire toutes]

The volcanic unrest at Turrialba seems to intensify, and signs of a possible new eruption in the near to medium future are getting stronger: According to OVSICORI-UNA a gas-and-steam plume from Turrialba rose to an altitude greater than 5.3 km (17,400 ft) a.s.l. on 5 December. Fieldwork confirmed an unusual output of gas from several fumaroles along the S outer wall. Areas burned by acute acidification have extended in the last month. Pastures turned yellowish near the upper areas, and native and exotic tree species were impacted as well as birch tree patches along most drainages. Within the W crater, temperatures of fumaroles reached 280 degrees Celsius and native sulfur was present. ...plus

Unrest at Turrialba volcano continues. Increased fumarolic activity had started in August 2006 and is concentrated mainly  to the W of Turrialba's central crater.

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Volcanic unrest at Turrialba volcano continues. Signs of an ongoing slow intrusion of magma at shallow depths indicating a possible eruption in the near-medium term future increase. ...plus [lire toutes]

On 6 May, scientists from OVSICORI declared a Low Alert Level for Turrialba based on rapid changes during the previous three months, and intensified their fieldwork and data collection efforts. During aerial observation in February 2007, trees looked yellowish due to sustained gas emissions from the W crater. Vegetation growth was noted in previously burned areas on the W and SW flanks near the summit. On 21 April, a hot area (40º C) was noted 1.5 km SW of the summit, at the base of the volcanic edifice, that coincides with the WSW-ENE-trending Ariete fault. On 2 May, two larger hot and fuming spots were documented along the same fault, about 200 m SW of the first area. The vapor plumes were spotted from several kilometers away, above the forest canopy. Heat destroyed vegetation in an approximately 300 square m area along the S fault's plane.

Fumarolic activity and gas discharge in and to the W of Turrialba's centralcrater continued throughout September. New points of gas discharge, smalll and slides, and accelerated vegetation die-off were noted from various locations within the crater.