The authorities of Argentina and Chile have raised the technical alert level to yellow for the Nevados de Chillán Volcanic Complex, located in the Chilean region of Ñuble and near the province of Neuquén. The decision is due to an increase in seismic and surface activity detected in recent days.
The change was reported by the Argentine Geological Mining Service (SEGEMAR) and the National Geology and Mining Service of Chile (Sernageomin), organizations that maintain constant surveillance over one of the most active volcanic systems in southern America.
Additionally, specialists emphasize that continuous monitoring is essential not only to protect nearby communities but also to preserve the mountain ecosystems that depend on the environmental stability of the region.
A strategic volcano for the mountain range
The Nevados de Chillán Volcanic Complex is entirely located in Chilean territory, within the Ñuble region. However, its proximity to Argentina makes it a phenomenon of interest for both countries.
Among the nearest Neuquén localities are Las Ovejas, located 56 kilometers away, Manzano Amargo 58 kilometers away, and Varvarco 65 kilometers from the volcanic complex. For this reason, binational organizations maintain cooperation protocols and constant surveillance.
Furthermore, the volcano has recent activity history. Between 2015 and 2022, it went through an eruptive cycle characterized by low-intensity explosions, ash emissions, gases, and pyroclastic materials that temporarily altered the natural environment.
Signals that prompted the alert change
Increased surveillance began after the detection of several minor eruptive pulses recorded on June 15, 2026. During that day, at least five emissions of pyroclastic material were observed from the active crater.
Additionally, the columns reached heights close to 160 meters above the crater level and mainly moved towards uninhabited sectors located to the southeast.
At the same time, monitoring stations detected a sustained increase in seismic activity associated with the movement of fluids and the ascent of new magmatic material under the Las Termas subcomplex, a situation that requires permanent observation.
What a yellow alert means
Within the volcanic monitoring scale, the yellow level indicates that the system shows changes from its usual behavior, although without evidence of an imminent major eruption.
Consequently, scientific organizations intensify measurements, strengthen communication channels, and update preventive plans for nearby populations.
Meanwhile, authorities emphasize that no impacts have been recorded on Argentine territory nor the presence of volcanic ash in suspension over the border, according to reports from the National Meteorological Service.
Recommended precautions under a yellow alert
Although the immediate risk remains low, a yellow alert requires adopting preventive measures to minimize possible environmental and health impacts.
Main recommendations include staying informed only through official sources, respecting access restrictions to areas near the crater, and reviewing family emergency plans in nearby localities.
Additionally, it is advisable to have stored potable water, flashlights, a radio, essential documentation, and respiratory protection items in case of potential ash fall. In rural areas, it is also advised to protect water sources for animals and crops.
Finally, those engaging in recreational or tourist activities in mountain areas should consult updated reports before undertaking any movement.
Permanent surveillance to protect communities and ecosystems
The monitoring will continue in a coordinated manner between SEGEMAR, Sernageomin, the Federal Emergency Agency, and the organizations that make up the National System for Comprehensive Risk Management.
Besides safeguarding the population, this task allows for evaluating possible effects on Andean forests, watercourses, wildlife, and natural areas of high ecological value.
Thus, cooperation between Argentina and Chile is consolidated as a key tool to anticipate risk scenarios and strengthen environmental conservation in one of the most important volcanic regions in South America.
