Rincon de la Vieja volcano lake down to 5 meters
10 JUNE 2016. The constant changes in the Rincon de la Vieja volcano has forced the experts to make more frequent monitoring in the active crater. Recent weeks have seen increased activity, and with reports from three villages of a high plume rising above the mountain. Gino Gonzalez, volcanologist at the Research Center in Geological Sciences (CICG), is one of the experts who came to the volcano for a new inspection, and took several samples.
The one that caught the attention of specialists was that the lake has decreased in depth by 5 meters, exposing several terraces of volcanic material, caused by old eruptions or landslides in the crater. « Normally lake temperature range between 28 ° and 30 ° C, however in the latter field work, we are recording temperatures up to 40 ° C, causing the lake to evaporate and is that one of the causes of current depth, « said Gonzalez.
But that is not the only cause of variation in the lush turquoise lagoon, we must remeber that 22 days ago, a phreatic eruption ejected material onto one of the slopes, which was seen by residents of the northern part of Upala.
ACCUMULATION OF SULPHUR
The accumulation of sulfur on several walls of the crater is visible and experts say that is a clear message of possible further eruptions, also seen was liquid jets, at melting temperature.
« Sulfur clusters are in the fumarole. This is caused by the output of sulfur dioxide and hydrogen sulfide interacting. When the liquid gets hot in the lake, it descends to the bottom of the lake; accumulating at greater than 120 ° C temperature, causing it to be so fluid.
Later clusters are made in the background and that’s what caused the explosions from the bottom. This indicates that something in the system is hotter and can produce more phreatic eruptions, when sulfur is heated to 180 ° C becomes hard again, it becomes a plug and then expelled to the surface, which are those jets of liquid sulfur, « said volcanologist from CICG.
Such eruptions are similar to those that occur in the phreatic Turrialba and Poas volcanoes, which registered a similar weekend that rose at least 10 meters. Since October, the Rincon de la Vieja volcano has been acting very similar with these types of small explosions, but to date the changes are noticeable, and very significant change to the structure of the lake.
THE MOST ACTIVE HISTORICALLY
This volcano, which rises in the Volcanic Cordillera de Guanacaste, is historically the most active in the country, and periods of calm are very short, if not zero, since it remains active even at a passive level, but does not stop degassing. The last major eruption recorded occurred in 1996 when a lot of material came down the slope bordering the river Penjamo, which took away everything and demolished a bridge near the community of the same name.
Historically, the first ever sightings of an eruption, come from the Guanacaste by boats arriving in the area in 1747.
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June 12 , 2016. Rincon de la Vieja , Costa Rica :
Source : Diarrio Correo