A vast cloud of ash spewing from a Chilean volcano disrupted air travel yesterday across much of South America, as heavy rains around the eruption site prompted fears of mudslides.
Air traffic was sharply curtailed on the continent as the ash cloud drifted over Argentina, and into Brazil. Flights in and out of the Argentine capital Buenos Aires, a key regional hub, were canceled for most of the day.
However, officials at Uruguay’s main Carrasco airport said late on Tuesday that the situation was expected to normalize in the coming day, after more than 90 percent of flights were canceled due to safety concerns over the cloud.
Rain mixed with volcanic ash poured down on communities near the Puyehue-Cordon Caulle volcano chain on Tuesday, raising fears that the weight of falling water and volcanic materials could cause mudslides and threaten dams in the area.
A milky coating of ash settled on the waters of Gol Gol River, which was swollen by heavy rains.
“We are concerned about water that can drag the volcanic material certain places and cause some dams to fall,” Public Works Minister Hernan de Soliminhac said.
Enrique Valdivieso, director of Chile’s National Service of Geology and Mines, said heavy rains would not quell the power of the volcano, but could bring gases and ash to the surface, contaminating rivers.
Valdivieso said Puyehue’s eruptions have slowed but there is still a risk of large amounts of sediment pouring down from the eruption.
Across the border in Argentina, residents were without electricity or drinking water in the winter resort of Bariloche as a torrent of mud and volcanic ash wreaked havoc.
The problems were worsened by heavy rains that mixed with ash and caused power generators to short circuit, creating more havoc.
“I came with my family the day of the eruption. Since then I can’t understand what is happening,” said Augusto Reales, a tourist from northern Argentina, as he boarded a bus to leave the resort area. “We can’t stay with so much uncertainty.”
On Lake Nahuel Huapi, one of Bariloche’s main tourist attractions, the emerald green waters were covered with patches of black ash.
“The eruption has begun to lose power but the active phase of the volcano is going to last for weeks or months,” said Gustavo Villarosa, a volcanologist.
The price for face masks surged in several days to the equivalent of US$8, prompting warnings from local officials.
The main worry for Bariloche was the closure of its airport — its runways blanketed with a thick coat of ash — just ahead of the ski season, the big draw for the local economy.
Meanwhile, Brazilian officials said the volcanic cloud had moved over the southern states of Rio Grande do Sul and Parana.
The cloud is crossing Brazilian territory “in the upper atmosphere,” said Saulo Freitas at the Brazilian Institute of Space Research. He said the cloud was likely to continue toward the Atlantic coast at an altitude of 8,000m to 12,000m.
A total of 62 flights were canceled Tuesday at the two airports in the Argentine capital, but aviation officials in Buenos Aires said flights were being rescheduled.
About 90 percent of flights into Montevideo were canceled, and other flights from Brazil and Chile crossing over the affected area were scrapped due to fears of volcanic ash that could damage jet engines.