SANTIAGO – Chile has raised the alert at the Nevados de Chillan ahead of a possible eruption at one of the most active volcanoes in Chile, after plumes of white smoke and registered tremors were reported by authorities.
The National Geology and Mining Service (Sernageomin) issued an orange alert at the Nevados de Chillán Volcanic Complex, in the province of Ñuble.
Surrounded by dense forest and rivers, this volcanic complex, which comprises 17 craters, is located some 550 kilometers (300 miles) south of Santiago in the Bio Bio region of the Chilean Andes.
Since 2015, the alert level has remained at yellow — the second lowest of four levels — but since December, several eruptions of ash have suggested increased activity, prompting officials to raise the alert by one level, to orange.
On Friday, teams of police and experts from the state-run Sernageomin deployed to the site — which reaches an altitude of 3,200 meters (10,500 feet) — saw a huge column of white smoke rising from one of the craters.
Sernageomin also detected an unusual flow of lava in the crater which could spill over at any time, and data from 10 monitoring stations, which track the situation by the minute, registered some 4,000 tremors and around 800 explosions.
“The behavior has risen and if the tensions continue to rise, it is necessary to alert the population,” said Bío Bío mayor Jorge Ulloa.
Unable to determine exactly when an eruption is likely, experts are constantly monitoring the situation from the volcanic observatory in Temuco, a city in the southern Andes, some 600 kilometers south of Santiago.
Between 1861 and 2003, Chillan erupted around 10 times, with varying magnitudes on the Volcanic Explosivity Index.
The last recorded instance was in 1973, although the eruption caused no deaths or major damage.
Several ski resorts dot the slopes of Chillan, a popular tourist destination which boasts a clutch of luxury hotels. There are no major urban centers in the area.
Chile has about 90 active volcanoes.