A general view of Calbuco volcano spewing ash and smoke near Puerto Varas, April 30, 2015. Chilean volcano Calbuco, which erupted twice last week, began sending a new cloud of ash and gas high into the sky on Thursday. REUTERS/Ivan Alvarado TPX IMAGES OF THE DAY

A cow rests in the countryside of Cochamo town in the vicinity of Calbuco volcano, May 1, 2015. REUTERS/Ivan Alvarado TPX IMAGES OF THE DAY

An excavator works on a river affected by ashes from Calbuco Volcano in El Tepu town, May 2, 2015. Chilean volcano Calbuco erupted for the third time in eight days on Thursday, sending a new cloud of ash and gas high into the sky, although officials said the latest eruption was less powerful than those of last week. Picture taken May 2, 2015. REUTERS/Carlos Gutierrez 

A sculpture is seen next to a soldier at Ensenada town, which is covered in ash from Calbuco volcano, in Puerto Varas, Chile April 30, 2015 Chilean volcano Calbuco erupted for the third time in eight days on Thursday, sending a new cloud of ash and gas high into the sky, although officials said the latest eruption was less powerful than those of last week. REUTERS/Ivan Alvarado 

Soldiers remove ash that fell from Calbuco Volcano, in the town of Ensenada in Puerto Varas, Chile April 30, 2015. Chilean volcano Calbuco erupted for the third time in eight days on Thursday, sending a new cloud of ash and gas high into the sky, although officials said the latest eruption was less powerful than those of last week. REUTERS/Ivan Alvarado 

A man carries belongings from an area damaged by lahar from Calbuco Volcano at Correntoso near Chamiza, April 29, 2015. REUTERS/Ivan Alvarado 

A cat sits on a fence at a house near Ensenada town which is covered with ashes from Calbuco Volcano, April 27, 2015. Massive cleanup efforts continue in Chile after volcano Calbuco erupted without warning last week. Calbuco has spewed 210 million tonnes of ashes in the immediate surroundings, according to the National Service of Geology and Mining, coating nearby towns and prompting the evacuation of more than 6,500 locals. REUTERS/Ivan Alvarado 

A scarecrow is seen in a backyard of a house nearby Ensenada which is covered with ashes from Calbuco Volcano, April 27, 2015. Massive cleanup efforts continue in Chile after volcano Calbuco erupted without warning last week. Calbuco has spewed 210 million tonnes of ashes in the immediate surroundings, according to the National Service of Geology and Mining, coating nearby towns and prompting the evacuation of more than 6,500 locals. REUTERS/Ivan Alvarado

Soldiers arrive to help at Ensenada town which is covered with ashes from Calbuco Volcano, April 27, 2015. Massive cleanup efforts continue in Chile after volcano Calbuco erupted without warning last week. Calbuco has spewed 210 million tonnes of ashes in the immediate surroundings, according to the National Service of Geology and Mining, coating nearby towns and prompting the evacuation of more than 6,500 locals. REUTERS/Ivan Alvarado
TPX IMAGES OF THE DAY

A sheep lies on the ashes of Calbuco Volcano at Ensenada town, in the vicinity of Puerto Montt city April 26, 2015. The Chilean volcano Calbuco was quieter on Sunday after unexpectedly erupting last week and puffing out plumes of gray ash, but authorities said it could erupt again and worries about the environmental impact grew. REUTERS/Ivan Alvarado

A pool with dead salmons is seen at a salmon production plant which was damaged by lahar from Calbuco Volcano at Correntoso near Chamiza, April 25, 2015. Ash from the Chilean volcano Calbuco, which erupted without warning this week, reached as far as southern Brazil on Saturday and prompted some airlines to cancel flights to the capitals of Chile, Argentina and Uruguay. REUTERS/Ivan Alvarado
TPX IMAGES OF THE DAY

Residents are seen in an area damaged by lahar from Calbuco Volcano at Correntoso near Chamiza, April 25, 2015. Ash from the Chilean volcano Calbuco, which erupted without warning this week, reached as far as southern Brazil on Saturday and prompted some airlines to cancel flights to the capitals of Chile, Argentina and Uruguay. REUTERS/Ivan Alvarado

A soldier helps a resident climb onto a broken bridge at an area damaged by lahar from Calbuco Volcano at Correntoso near Chamiza, April 25, 2015. Ash from the Chilean volcano Calbuco, which erupted without warning this week, reached as far as southern Brazil on Saturday and prompted some airlines to cancel flights to the capitals of Chile, Argentina and Uruguay. REUTERS/Ivan Alvarado

A broken bridge damaged by lahar from Calbuco Volcano is seen at Correntoso near Chamiza, April 25, 2015. Ash from the Chilean volcano Calbuco, which erupted without warning this week, reached as far as southern Brazil on Saturday and prompted some airlines to cancel flights to the capitals of Chile, Argentina and Uruguay. REUTERS/Ivan Alvarado

A resident carries a mattress through an area damaged by lahar from Calbuco Volcano at Correntoso near Chamiza, April 25, 2015. Ash from the Chilean volcano Calbuco, which erupted without warning this week, reached as far as southern Brazil on Saturday and prompted some airlines to cancel flights to the capitals of Chile, Argentina and Uruguay. REUTERS/Ivan Alvarado
TPX IMAGES OF THE DAY

A worker stands on tree debris on a bridge in an area damaged by lahar from Calbuco Volcano at Correntoso near Chamiza, April 25, 2015. Ash from the Chilean volcano Calbuco, which erupted without warning this week, reached as far as southern Brazil on Saturday and prompted some airlines to cancel flights to the capitals of Chile, Argentina and Uruguay. REUTERS/Ivan Alvarado

Soldiers help a resident to cross a river after lahar from Calbuco Volcano at Correntoso near Chamiza, April 25, 2015. Ash from the Chilean volcano Calbuco, which erupted without warning this week, reached as far as southern Brazil on Saturday and prompted some airlines to cancel flights to the capitals of Chile, Argentina and Uruguay. REUTERS/Ivan Alvarado

People clean an ash-covered roof of a house in Ensenada town, April 24, 2015. Chilean volcano Calbuco, which erupted without warning on Wednesday, is still puffing out ash and smoke, leading airlines to cancel flights from Argentine capital Buenos Aires, some 1,400 kilometers east. Calbuco, considered one of the most dangerous along Chile's chain of around 500 active volcanoes, erupted twice in 24 hours on Wednesday and Thursday, sending up a spectacular 17 kilometer-high (11 miles) cloud and coating nearby towns in a thick layer of grey ash. REUTERS/Ivan Alvarado
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People who are displaced from their houses ride a military vehicle as they leave from Ensenada town, which is covered with ashes from Calbuco volcano, near Puerto Varas city April 23, 2015. The volcano in southern Chile erupted for the first time in more than five decades on Wednesday, sending a thick plume of ash and smoke into the sky. REUTERS/Ivan Alvarado TPX IMAGES OF THE DAY

Smoke and ash rise from the Calbuco volcano as seen from the city of Puerto Montt, April 22, 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. REUTERS/Sergio Candia 

A boat is seen in a house backyard at Ensenada town which is covered with ash 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. REUTERS/Ivan Alvarado 

A local stands as ash falls from Calbuco volcano in the Patagonian Argentine area of San Marin de Los Andes April 22, 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. Picture taken April 22. REUTERS/Patricio Rodriguez

A woman stands inside the remains of a gym that collapsed under the weight of ash from the Calbuco volcano in Puerto Varas April 23, 2015. An ash cloud from the Calbuco volcano in southern Chile that erupted unexpectedly on Wednesday was blowing into Chile and Argentina on Thursday, forcing the cancellation of flights from nearby cities in both countries and blanketing residents in ash. The volcano, which last had a major eruption in 1961, has belched a spectacular plume of ash and smoke around 15 kilometres (9 miles) into the sky near the popular tourist town of Puerto Varas, some 1,000 kilometres (625 miles) south of Santiago. REUTERS/Carlos Gutierrez 

Dogs look over a fence while standing on the ground covered in ash from Calbuco volcano in Ensenada, 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. REUTERS/Carlos Gutierrez TPX IMAGES OF THE DAY

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. 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. The volcano, which last had a major eruption in 1961, has belched a spectacular plume of ash and smoke around 15 kilometers into the sky near Puerto Varas, some 1,000 kilometers (625 miles) south of Santiago. REUTERS/Ivan Alvarado 

Smoke and lava spew from the Calbuco volcano, as seen from the shores of Lake Llanquihue in 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. REUTERS/Carlos Gutierrez

Smoke and lava spew from the Calbuco volcano, as seen from the shores of Lake Llanquihue in 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. REUTERS/Carlos Gutierrez TPX IMAGES OF THE DAY

A man shovels ash from Calbuco volcano off the roof of his home in Ensenada, 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. REUTERS/Carlos Gutierrez

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. REUTERS/Carlos Gutierrez