Costa Rica's restless Turrailba volcano rumbled to life early Tuesday morning (May 21), spitting ash and steam from its summit and prompting a small-scale evacuation. The small blast started at two fissures in the volcano's West Crater, the same site of earlier eruptions in 2010 and 2012, according to the Volcanological and Seismological Observatory of Costa Rica (Ovsicori). Twenty people and their animals were evacauted due to falling ash, the Associated Press reported.

The 10,958-foot (3,340-meter) Turrialba volcano is now on green alert, the lowest of three alert levels. Seismic tremors, which indicate magma, gas or fluids moving inside the volcano, also rattled the tall peak yesterday, Ovsicori said. The volcano's last big eruption was in 1866.

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