UPDATE: OVSICORI reports another explosion at 1:48 p.m. and a 2:26 p.m. report states that the ash column reached some 1,000 meters (some 3,280 feet).
Original story continues here:
The fumarole spewed materials for about 24 minutes and reached some 500 meters (1,640 feet) above the crater’s summit, located some 67 kilometers northeast of the capital San José.
A series of volcanic tremors in the surroundings of Turrialba canton followed the explosion, said Raúl Mora, a volcanologist with the National University’s National Seismological Network, who was at Turrialba at the time.
Mora said the explosion had a greater magnitude than those recorded last weekend.
See a video of the explosion recorded by an OVSICORI’s webcam: