The only question about a major volcanic eruption around the Central Valley is when, not if.
The valley is bracketed on the east by Turrialba and Irazú. In the west stands the inactive Barva and the very active Poás.
It is to Poás that emergency workers will go today to practice their response to a major eruption.
There will be a lot of activity in the cantons of Grecia, Poas and Alajuela as rescue workers transport the dead and injured after a supposed massive eruption. In addition to the national emergency commission, the Cruz Roja, Cuerpo de Bomberos and the Fuerza Pública will be involved.
Officials will be observing and evaluating, and expats are likely to see a lot of movement of emergency vehicles, starting at 9 a.m..
Eruptions are not just a theoretical possibility. Irazú spewed tons of ash on San José in 1963.
When Arenal started erupting July 29, 1968, it wiped out three communities, killed more than 85 persons and flung rocks the size of Volkeswagens up to a mile away.