A.M. Costa Rica predicted another thrilling eruption from the Volcán Turrialba between June 2 and 9.
Instead, the mountain went back to sleep after a June 1 eruption.
The May 26 prediction were based partly on some reader comments that the moon has an effect on volcanoes. The effects are well established on the world’s tides. There also had been some preliminary work done of the theory by Steve and Donna O’Meara in Italy 25 years ago.
The Red Sismológica Nacional at the Universidad de Costa Rica said that periods of calm are normal for volcanoes and that the experts were not discarding the possibility of more eruptions.
The mountain still is issuing a steady plume of mostly water vapor from the main crater.
The eruption prediction theory was based on the full moon, which was June 2 and the perigee of the moon’s orbit, which was June 9.
That is the time when the moon is closest to the earth.
The theory is that the period between the full moon and the perigee has more potential for eruptions.
The next perigee is July 5 just before 1 p.m. when the moon will be 367,093 kilometers or 228,101 miles from the earth.
The full moon took place July 1. The theory suggests that greater volcanic activity can be expected between the full moon and the perigee.
Volcano experts at the Red Sismológica Nacional have installed a new camera on the summit of Turrialba. However, the Internet link has not yet been published.