Volcanologists said the formation of a lava lake is obvious proof of the rise of magma to the surface.
Mud and other materials from the explosion fell on the Penjamo River and changed the water color.
An explosion on Saturday night hurled incandescent rocks and gases that damaged a Poás National Park’s office and also solar panels, a tower and a webcam from OVSICORI.
Vulcanologists conducted an inspection of Poás and found rocks of various diameters ranging from 40 centimeters to 2 meters (1.3-6.5 ft) that had been hurled as far as one kilometer through the air.
A National Seismological Network's report noted that low-intensity volcanic tremors are following ash explosions at Turrialba Volcano.
Weather conditions have prevented OVSICORI staff from approaching or conducting flyovers with a drone over the crater to measure the depth of the magma body.
Turrialba Volcano increased its activity once more over the weekend with vapor, gas and ash explosions, volcanologists reported.
Officials from Juan Santamaría International Airport (SJO), the country’s largest international terminal, reported normal operations on Thursday, although two airlines opted to delay flights on Thursday morning.
Residents reported ashfall from Turrialba Volcano on Thursday in northern areas of Heredia, Alajuela and San José and as far as the Caribbean province of Limón.
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