The activity of Turrialba has increased over the past days, especially during the night and the morning of 20 May.
A more violent explosive phase began this May 20 at 7:29 local time, giving an ash plume rising over 3000 meters with dispersion to the Valle Central. Several pyroclastic flows occurred by collapse of the eruption column and overflow into the crater. Part of the crater lake has been covered by pyroclastic deposits, causing a release of steam (end of RSN video)
Turrialba - explosion 05.20.2016 / 7:20 loc.et pyroclastic flow into the crater - Doc. RSN
Turrialba - plume and pyroclastic flow intracratérique - 05.20.2016 / 8:29 - NSN webcam
Turrialba - explosion 05.20.2016 / 7:20 loc.et pyroclastic flow into the crater - Doc. RSN - https://www.facebook.com/RSN.CR/videos/1130574777006094/
Turrialba - explosion 05.20.2016 / 7:20 loc saw from the neighbor volcano Irazu - Doc. Ovsicori
El Dr. Guillermo Alvarado Induni, from the RSN, harvest of ashes 20.05 during a field inspection - ash analysis at the laboratory of the RSN - a click to enlarge.
The Ovsicori indicates an eruption of Strombolian type.
The inhabitants of the capital San José, 45 km west of Turrialba, report that buildings and cars are covered with ashes, and a sulfur smell is noticeable. Hundreds of people went to hospitals complaining of breathing difficulties and skin problems. The authorities advise wearing masks and long sleeves, take containment measures for pets and cover the water supply. Some schools were closed and commercial flights canceled or diverted.
The ashes of the Turrialba volcano eruptions in early May 2016 were analyzed by the RSB: they are acidic, with a pH less than 4 and generate a rich leachate of electrolytes, composed mostly of fluoride (@ 0.2 mg / g ash), chloride (from 4 mg / g and 3 mg / g), sulphate (between 8 mg / g and 11 mg / g), Sodium (@ 0.2 mg / g ash), Magnesium (between 1.4 mg / g and 1.2 mg / g) and calcium (between 0.6 mg / g and 0.9 mg / g). The predominant anion is sulfate and the predominant cation is magnesium. Samples from the eruption of May 12 are less acidic than those of May 1, but richer in sulphate. These results indicate that the ash could have the potential to increase in a localized manner the ion concentration and reduce the pH of the surface water. However, the rains this time of year diminish the affection that these ashes may have on the body of water. - RSN
Sources: Ovsicorei & Conred
New powerful paroxysm at Voragine Crater of Mount Etna Volcano, Sicily. In the night, lava fountains and explosions from the Voragine Crater, in a astonishing scenario, with the fresh snow fallen yesterday on the Volcano. Full HD Video by Turi CaggegiAt Etna, following a slight lull, the tremor is increased again during the day of 20 May, and strombolian activity has taken place. The peak of the 3 peak in 72 hours was reached in the early morning of May 21, unfortunately obscured by clouds and ash obscuring webcams. sources: - INGV Catania - Photographs and video Alessandro Lo Piccolo and Turi Caggegi Etna - changes in tremor during the 3 recent paroxysms - the doc INGV Catania 05/21/2016 / 8:02 Etna - changes in tremor during the 3 recent paroxysms - the doc INGV Catania 05/21/2016 / 8:02 Etna strombolian activity and lava flow on 05/21/2016 / 5:15 CET - Photo © Alessandro Lo Piccolo
At Etna, following a slight calm, the tremor is increased again during the day of 20 May, and strombolian activity has retaken place.
The peak of the 3° peak in 72 hours was reached in the early morning of May 21, unfortunately obscured by clouds and ash obscuring webcams.
- INGV Catania
- Photographs and video : Alessandro Lo Piccolo and Turi Caggegi