The Turrialba volcano (in Cartago) increased the emission of gas and a crack in the wall of the volcano was extended after the earthquake last September 5 in Samara Nicoya, Guanacaste.
This was stated by the “Report on physical changes of the active volcanoes of Costa Rica”, issued by the National Seismological Network (RSN) last Friday.
Volcanologists indicated that the strong earthquake of 7.6 degrees varied fumarolic activity on the east wall of the active crater. The statement comes after noticing an increase in the release of gas.
“In general, we can say that there is an increase in exhaled activity, reported by neighbors and park rangers.
“We also observed repeatedly during September as gas output decreased by minutes and hours, then return exhaled vigorous activity,” they said in the document.
About the widening of the crack, volcanologists warned that there is the possibility that a fraction of that side to slide the active crater.
“Some fractures in the crater indicate that the rock mass, stability remains precarious and small landslides may occur inside the active crater,” they explained.
The field visit to the volcano was last September 7.
The report added that the earthquake left less sequels in Rincon de la Vieja volcano (Guanacaste) and Poás (Alajuela).
The volcanologists said the massive Guanacaste, has a very active hot lake, with an unusual release of gas from the month of April this year.
The experts added that the Rincon de la Vieja increased its temperature and gas activity.
For its part, the Poas volcano presents small phreatic eruptions (composed of gases, aerosols and ash) in the lake.
“Measurements indicate a lake, very active and molten sulfur release from the bottom of the lake, with temperatures around 50 ° C”, the experts said.
The Arenal Volcano in Alajuela, were landslides on the slopes, but had no significant alterations.
Meanwhile, Irazu in Cartago, presented no significant changes in his behavior after the quake.
The Seismological Network report said that does not rule out more changes in the massifs.