Volcano watchers said that two strong quakes took place Monday within the Turrialba volcano.
The Red Sismológica Nacional attributed the quakes to vibrations in the walls of the internal vents of the mountain due to the passage of vapor, gas and ash.
The Red said the first activity was reported at 12:40 p.m., and that a park guard reported the fall of ash. This emission lasted an hour and 10 minutes, said the Red.
Then at 2:44 p.m. there was another series of vibrations that lasted 27 minutes.
Volcano experts fully expect additional eruptions from the volcano. So far the most serious effects have been the closing three times of the major international airport in Alajuela because of ash on the runways.