Smoke rises from the Tungurahua volcano in Huambalo, Ecuador, on Tuesday, August 21. Increased volcanic activity has led authorities to raise a security alert from moderate to high. The volcano is 87 miles (140 kilometers) south of Quito, Ecuador's capital. <a href="http://ireport.cnn.com/topics/293965">Are you there? Send us your pictures and video.</a>
Ecuador's Tungurahua volcano —
Smoke rises from the Tungurahua volcano in Huambalo, Ecuador, on Tuesday, August 21. Increased volcanic activity has led authorities to raise a security alert from moderate to high. The volcano is 87 miles (140 kilometers) south of Quito, Ecuador's capital. Are you there? Send us your pictures and video.
EPA/LANDOV
Volunteer Carlos Sanchez analyzes samples of volcanic ash Tuesday in Banos, Ecuador. Calling himself "the Volcano Watcher," Sanchez assists volcanologists by observing Tungurahua.
Ecuador's Tungurahua volcano —
Volunteer Carlos Sanchez analyzes samples of volcanic ash Tuesday in Banos, Ecuador. Calling himself "the Volcano Watcher," Sanchez assists volcanologists by observing Tungurahua.
Reuters/Landov
Banos residents walk through the main square of town Tuesday as the nearby Tungurahua volcano spews ashes.
Ecuador's Tungurahua volcano —
Banos residents walk through the main square of town Tuesday as the nearby Tungurahua volcano spews ashes.
Reuters/Landov
Eruptions from the Tungurahua volcano have prompted authorities to evacuate nearby residents.
Ecuador's Tungurahua volcano —
Eruptions from the Tungurahua volcano have prompted authorities to evacuate nearby residents.
Reuters/Landov
The glacier-capped, 16,478-foot (5,023-meter) volcano has erupted periodically since 1999.
Ecuador's Tungurahua volcano —
The glacier-capped, 16,478-foot (5,023-meter) volcano has erupted periodically since 1999.
Reuters/Landov
Lava, ash and other volcanic material flows from Tungurahua on Tuesday. Tungurahua means "throat of fire" in the native Quechua language of the Andes.
Ecuador's Tungurahua volcano —
Lava, ash and other volcanic material flows from Tungurahua on Tuesday. Tungurahua means "throat of fire" in the native Quechua language of the Andes.
Reuters/Landov
A large cloud of ash blows over the town of Bilbao on Tuesday.
Ecuador's Tungurahua volcano —
A large cloud of ash blows over the town of Bilbao on Tuesday.
Reuters/Landov
Clouds of gas and ash from Tungurahua are visible Monday, August 20, in Banos, a town at the foot of the volcano.
Ecuador's Tungurahua volcano —
Clouds of gas and ash from Tungurahua are visible Monday, August 20, in Banos, a town at the foot of the volcano.
Reuters/Landov
Ash blankets the ground in Banos on Sunday, August 19.
Ecuador's Tungurahua volcano —
Ash blankets the ground in Banos on Sunday, August 19.
Reuters/Landov
Grass and trees in Banos appear gray from the showering of volcanic ash on Sunday.
Ecuador's Tungurahua volcano —
Grass and trees in Banos appear gray from the showering of volcanic ash on Sunday.
Reuters/Landov
Residents take cover Sunday near Banos as the volcano spews large clouds of gas and ash.
Ecuador's Tungurahua volcano —
Residents take cover Sunday near Banos as the volcano spews large clouds of gas and ash.
Reuters/Landov
A cow covered in ash stands along a road near Banos on Sunday.
Ecuador's Tungurahua volcano —
A cow covered in ash stands along a road near Banos on Sunday.
Reuters/Landov