The Sierra Negra volcano on the Galapagos island of Isabela is spewing fountains of lava and plumes of ash.
At least 250 people have been evacuated from the vicinity of the volcano after two strong earthquakes opened up fissures in the 1,124m-high (3688ft) volcano.
“The colossus is awakening,” Environment Minister Tarsicio Hail said, announcing that Ecuador’s authorities are closely watching seismic and geological activity in the area.
The volcano has the largest caldera of all of the Galapagos volcanoes, measuring seven by nine km (4.2 by 5.4 miles). The last time it erupted was in 2005.
“And Little Krakatoa is muttering also,” says Laurel. “Combined volcanic emissions adds to cooling. Looking grim futurewise.”