Activity increases at Costa Rica’s Rincón de la Vieja volcano

Rincón de la Vieja has recorded more than 100 eruptions since July, including its most powerful event of the year, Costa Rican authorities said.

The Aug. 31 eruption expelled material and sent hot lahars, or flows of mud and rock, down river channels. The National Emergency Commission activated a green information alert for districts in the cantons of Upala and Liberia, near the volcano in Guanacaste province.

About 20 eruptive events were recorded at Rincón de la Vieja over the previous weekend alone. The volcano stands inside Rincón de la Vieja National Park, about 280 kilometers northwest of San José. Climbing to its summit has been prohibited since 2012.

Authorities told residents to avoid rivers that may carry volcanic material and prevent animals from drinking the water. They also advised people to avoid unnecessary exposure to ash, use masks and seek medical attention if health problems arise. Technical and scientific agencies continue to monitor conditions and will report any changes.

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The Aug. 31 eruption at 4:37 p.m. had the highest energy recorded so far this year, ejecting material and sending hot lahars, with mud and rock flows that can travel along rivers.