The Calbuco volcano erupts near Puerto Varas, Chile, Thursday, April 23, 2015. The volcano erupted Wednesday for the first time in more than 42 years, billowing a huge ash cloud over a sparsely populated, mountainous area in southern Chile, and is considered one of the top three most potentially dangerous among Chile's 90 active volcanos. (Photo by David Cortes Serey/AP Photo/Agencia Uno)

Children watch the Calbuco volcano erupt, from Puerto Varas, Chile, Wednesday, April 22, 2015. The volcano erupted billowing a huge ash cloud over a sparsely populated, mountainous area in southern Chile. Authorities ordered the evacuation of the inhabitants of the nearby town of Ensenada, along with residents of two smaller communities. (Photo by Carlos F. Gutierrez/AP Photo)

View of the Villarrica volcano taken from Pucon, some 800 km south of Santiago, showing visible signs of activity on April 21, 2015. (Photo by Sebastian Escobar/AFP Photo)

The Calbuco volcano is seen erupting from Puerto Varas, Chile, Wednesday, April 22, 2015. The volcano erupted billowing a huge ash cloud over a sparsely populated, mountainous area in southern Chile. Authorities ordered the evacuation of the inhabitants of the nearby town of Ensenada, along with residents of two smaller communities. (Photo by Carlos F. Gutierrez/AP Photo)

Smoke and ash rise from the Calbuco volcano, seen from Puerto Varas city, south of Santiago, April 22, 2015. Volcano Calbuco in southern Chile erupted for the first time in more than five decades on Wednesday, sending a thick plume of ash and smoke several kilometres into the sky. (Photo by Carlos Gutierrez/Reuters)

Smoke and ash rise from the Calbuco volcano, seen from Puerto Varas city, south of Santiago, April 22, 2015. (Photo by Carlos Gutierrez/Reuters)

Smoke and ash rise from the Calbuco volcano as seen from the city of Puerto Montt, April 22, 2015. (Photo by Rafael Arenas/Reuters)

Smoke and ash rise from the Calbuco volcano as seen from the city of Puerto Montt, April 22, 2015 (Photo by Rafael Arenas/Reuters)

Smoke and ash rise from the Calbuco volcano as seen from the city of Puerto Montt, April 22, 2015. (Photo by Sergio Candia/Reuters)

Smoke and ash rise from the Calbuco volcano, seen from Puerto Varas city, south of Santiago, April 22, 2015. (Photo by Carlos Gutierrez/Reuters)

Smoke and ash rise from the Calbuco volcano as seen from the city of Puerto Montt, April 22, 2015. (Photo by Sergio Candia/Reuters)

Smoke and ash rise from the Calbuco volcano as seen from the city of Puerto Montt, April 22, 2015. (Photo by Sergio Candia/Reuters)

Smoke and lava spew from the Calbuco volcano, as seen from the shores of Lake Llanquihue in Puerto Varas, April 23, 2015. (Photo by Carlos Gutierrez/Reuters)

Smoke and lava spew from the Calbuco volcano, as seen from Puerto Varas, April 23, 2015. The Calbuco volcano in southern Chile erupted for the first time in more than five decades on Wednesday, sending a thick plume of ash and smoke several kilometres into the sky. Lightning is seen in the sky above the volcano. (Photo by Carlos Gutierrez/Reuters)

Smoke and lava spew from the Calbuco volcano, as seen from the shores of Lake Llanquihue in Puerto Varas, April 23, 2015. (Photo by Carlos Gutierrez/Reuters)

General view of Chilean Calbuco volcano from Puerto Montt, located at 1000 km southern Santiago de Chile, Chile, 22 April 2015. Due to the eruption of the volcano with a smoke column 20 km high, authorities declared a red alert and ordered the evacuation of around 1500 inhabitants of Ensenada, Alerce, Colonia Río Sur and Correntoso towns. (Photo by Alex Vidal Brecas/EPA)

The Calbuco volcano erupts near Puerto Varas, Chile, Wednesday, April 22, 2015. (Photo by Diego Main/AP Photo/Aton Chile)

View from Puerto Varas, southern Chile, of a high column of ash and lava spewing from the Calbuco volcano, on April 22, 2015. Chile's Calbuco volcano erupted on Wednesday, spewing a giant funnel of ash high into the sky near the southern port city of Puerto Montt and triggering a red alert. Authorities ordered an evacuation for a 10-kilometer (six-mile) radius around the volcano, which is the second in southern Chile to have a substantial eruption since March 3, when the Villarrica volcano emitted a brief but fiery burst of ash and lava. (Photo by Giordana Schmidt/AFP Photo)

View from the Nahuel Huapi lake, province of Rio Negro, 1570 km southwest of Buenos Aires, of a menacing cloud from the Calbuco volcano in neighbouring Chile, on April 22, 2015. (Photo by Francisco Ramos Mejia/AFP Photo)

View of the road to San Carlos de Bariloche, province of Rio Negro, 1570 km southwest of Buenos Aires, with a menacing ashes cloud from the Calbuco volcano in neighbouring Chile, on April 22, 2015. (Photo by Francisco Ramos Mejia/AFP Photo)

View from Puerto Montt, southern Chile, of a high column of ash and lava spewing from the Calbuco volcano, on April 22, 2015. (Photo by Diego Main/AFP Photo)

A woman holds a mask to her face as she stands with her belongings before evacuating the town of Ensenada, Chile after the Calbuco volcano erupted, Thursday, April 23, 2015. The volcano erupted Wednesday for the first time in more than 42 years, billowing a huge ash cloud over a sparsely populated, mountainous area in southern Chile, and is considered one of the top three most potentially dangerous among Chile's 90 active volcanoes. (Photo by Pablo Sanhueza Gutierrez/AP Photo)

A bus drives along an ash covered road, caused by the eruption of Chile's Calbuco volcano in Villa La Angostura, in southern Argentina, Thursday, April 23, 2015. The volcano erupted Wednesday afternoon for the first time in more than four decades, and then had another outburst early Thursday. No injuries are reported but one hiker remains missing. (Photo by Federico Grosso/AP Photo)

People evacuate the town of Ensenada, Chile after the Calbuco volcano erupted Thursday, April 23, 2015. (Photo by Pablo Sanhueza Gutierrez/AP Photo)

A car covered with ashes from the Calbuco volcano is seen in the Patagonian Argentine city of San Carlos de Bariloche April 23, 2015. Volcano Calbuco in southern Chile erupted for the first time in more than five decades yesterday, sending a thick plume of ash and smoke nearly 20 kilometers (12 miles) into the sky. Chile's Onemi emergency office declared a red alert following the sudden eruption which occurred near the tourist town of Puerto Varas. As night fell, about 4,000 people had so far moved out of the area, an evacuation radius of 20 kilometers (12 miles) had been established and classes had been cancelled in surrounding towns, authorities said. (Photo by Chiwi Giambirtone/Reuters)

A resident walks down a sidewalk covered with ash from the Calbuco volcano in the Patagonian Argentine city of San Carlos de Bariloche April 23, 2015. (Photo by Chiwi Giambirtone/Reuters)

Residents wash a sidewalk covered with ashes from the Calbuco volcano in the Patagonian Argentine city of San Carlos de Bariloche April 23, 2015. (Photo by Chiwi Giambirtone/Reuters)

A resident walks by the Centro Civico (Civic Centre) covered with ash from the Calbuco volcano in the Patagonian Argentine city of San Carlos de Bariloche April 23, 2015. Volcano Calbuco in southern Chile that erupted unexpectedly on Wednesday was still pouring ash into the sky on Thursday, forcing the cancellation of flights from nearby towns in both Chile and neighboring Argentina. The volcano, which last had a major eruption in 1961, has blown a spectacular plume of ash and smoke nearly 20 kilometers into the sky near Puerto Varas, some 1,000 kilometers (625 miles) south of Santiago. (Photo by Alejandra Bartoliche/Reuters)

A man uses a window to enter his house at Ensenada town which is covered with ashes from Calbuco volcano near Puerto Varas city, April 23, 2015. (Photo by Ivan Alvarado/Reuters)

A bicycle lies parked on a street at Ensenada town which is covered with ashes from Calbuco volcano near Puerto Varas city, April 23, 2015. (Photo by Ivan Alvarado/Reuters)

Horses are seen at a playground area covered with ash from Calbuco volcano at Ensenada town near Puerto Varas city April 23, 2015. (Photo by Ivan Alvarado/Reuters)

Vehicles travel along a road at Ensenada town which is covered with ashes from Calbuco volcano near Puerto Varas city, April 23, 2015. (Photo by Ivan Alvarado/Reuters)

A boat is seen in a house backyard at Ensenada town which is covered with ashes from Calbuco volcano near Puerto Varas city, April 23, 2015. An ash cloud from volcano Calbuco in southern Chile that erupted unexpectedly on Wednesday was blowing into Chile and Argentina on Thursday, forcing the cancellation of flights from nearby towns in both countries. (Photo by Ivan Alvarado/Reuters)

Clothes are seen on a fence in the backyard of a house at Ensenada town which is covered with ashes from Calbuco volcano near Puerto Varas city, April 23, 2015. (Photo by Ivan Alvarado/Reuters)

A playground area is seen at Ensenada town which is covered with ashes from Calbuco volcano near Puerto Varas city, April 23, 2015. (Photo by Ivan Alvarado/Reuters)

A man cleans the roof of his house at Ensenada town which is covered with ashes from Calbuco volcano near Puerto Varas city, April 23, 2015. (Photo by Ivan Alvarado/Reuters)

Dogs are seen on a street at Ensenada town which is covered with ashes from Calbuco volcano near Puerto Varas city, April 23, 2015. (Photo by Ivan Alvarado/Reuters)

A bulldozer removes ash from a street at Ensenada town which is covered with ashes from Calbuco volcano near Puerto Varas city, April 23, 2015. (Photo by Ivan Alvarado/Reuters)

A man removes ash under his truck at Ensenada town which is covered with ashes from Calbuco volcano near Puerto Varas city, April 23, 2015. (Photo by Ivan Alvarado/Reuters)

A vehicle travels along a road at Pucon city, which was hit by ashes from Calbuco volcano, April 23, 2015. An ash cloud from volcano Calbuco in southern Chile that erupted unexpectedly on Wednesday was blowing into Chile and Argentina on Thursday, forcing the cancellation of flights from nearby towns in both countries. (Photo by Cristobal Saavedra/Reuters)

A man cries after his home collapsed under the weight of ash that had fallen on the roof, at a shelter at a school in Puerto Varas, April 23, 2015. (Photo by Carlos Gutierrez/Reuters)

A man shovels ash from Calbuco volcano off the roof of his home in Ensenada, April 23, 2015. (Photo by Carlos Gutierrez/Reuters)

A man shovels ash from Calbuco volcano off the roof of his home in Ensenada, April 23, 2015. (Photo by Carlos Gutierrez/Reuters)

Sheep and cattle eat next to a collapsed shed and standing on ground covered with ash from Calbuco volcano in Ensenada, April 23, 2015. (Photo by Carlos Gutierrez/Reuters)

Dogs look over a fence while standing on the ground covered in ash from Calbuco volcano in Ensenada, April 23, 2015. (Photo by Carlos Gutierrez/Reuters)

Men remove ash from a building's roof, left by the Calbuco volcano, in Ensenada, Chile, Thursday, April 23, 2015. (Photo by Pablo Sanhueza Gutierrez/AP Photo)

A man tries to remove ash from a small tractor at the Ensenada locality, outskirts of Calbuco volcano, which erupted this 22 April after 40 years without activity, Los Lagos region, south of Chile, on 23 April 2015. More than 4,000 people have been evacuated so far because of the two recorded eruptions of the volcano, officials said. (Photo by Felipe Trueba/EPA)

General view of ash covered houses of Ensenada locality, on the outskirts of Calbuco volcano, which erupted this 22 April after 40 years without activity, Los Lagos region, south of Chile, on 23 April 2015. (Photo by Felipe Trueba/EPA)

A car is covered in ash after the Calbuco volcano erupted in Ensenada, Chile, Thursday, April 23, 2015. (Photo by Pablo Sanhueza Gutierrez/AP Photo)

Leaves sit on ground covered by volcanic ash from Chile's Calbuco volcano in Villa La Angostura, southern Argentina, Thursday, April 23, 2015. The volcano in Southern Chile has erupted after being dormant for about half a century on Wednesday, sending a thick plume of ash and smoke several kilometers into the sky. (Photo by Federico Grosso/AP Photo)

A local walks as ash falls from Calbuco volcano in the Patagonian Argentine area of San Marin de Los Andes April 22, 2015. (Photo by Patricio Rodriguez/Reuters)

A car is seen covered in ash from Calbuco volcano in the Patagonian Argentine area of San Marin de Los Andes, Argentina April 22, 2015. (Photo by Patricio Rodriguez/Reuters)

Residents walk as ash falls from Calbuco volcano in the Patagonian Argentine area of San Marin de Los Andes April 22, 2015. (Photo by Patricio Rodriguez/Reuters)

A local walks as ash falls from Calbuco volcano in the Patagonian Argentine area of San Marin de Los Andes April 22, 2015. (Photo by Patricio Rodriguez/Reuters)

People, wearing surgical masks to protect themselves against ash from Calbuco volcano, buy groceries at a supermaket in the Patagonian Argentine area of San Marin de Los Andes April 22, 2015. (Photo by Patricio Rodriguez/Reuters)

A woman, wearing a surgical mask to protect herself against ash from Calbuco volcano, walks by the Centro Civico (Civic Centre) in the Patagonian Argentine city of San Carlos de Bariloche April 23, 2015. (Photo by Alejandra Bartoliche/Reuters)

Rosehips are seen covered with ash from the Calbuco volcano in the Patagonian Argentine area of San Martin de Los Andes April 23, 2015. (Photo by Patricio Rodriguez/Reuters)