Earthquake in Colombia, June 6: Epicenter, Magnitude and Where It Was Felt | composition

From monitoring the activity of the Nevado del Ruiz volcano, the Ministry of Mines and
ENERGÍA reports through the Colombian Geological Service (SGC):

From 9:00 a.m. yesterday (June 4) until the time of publication of this bulletin, seismic activity associated with rock fracturing within the volcanic edifice showed a slight increase in the number of earthquakes and seismic energy. Before (June 3).

The earthquake was mainly on the northeast side, 3 to 4 km from the crater, with a depth of 4 to 5 km. The maximum magnitude of 1.3 associated with the 03:50 AM earthquake today, located 3 km northeast of the Arenas Crater at a depth of 5 km from the volcano’s summit, was recorded at 1.3. Along with this, an earthquake at 1.2 and 2 km depth was reported in the Arenas trough at 09:34 am yesterday.

Seismicity, related to the movement of fluids within volcanic conduits, was similar in number of earthquakes and slightly decreased in seismic energy associated with June 3. Some seismic signals are associated with pulsatile ash emissions confirmed by web cameras used for volcano monitoring.

On the other hand, variations continued in the outgassing of sulfur dioxide and the release of steam from the crater into the atmosphere. The maximum height of the column of gases and steam was measured at 500 m from the top of the volcano and the direction of dispersion of the column was towards the northwest.

The activity of the Nevado del Ruiz volcano continues to be very erratic. It should be remembered that even if several days have passed with less seismic activity compared to previous weeks, this does not mean that the volcano has returned to its normal activity, so it is recommended not to get it. These oscillatory changes in activity are thought to be the normal behavior of a volcano.

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Satellite detection of significant thermal anomalies at the bottom of the crater indicates the presence of very hot material near the surface. Recurring ash emissions, sometimes pulsating and sometimes continuous, the persistence of a small crater in the landscape, as well as variations in sulfur dioxide emissions indicate that the volcano may still be active. A large eruption over days or weeks.

As we mentioned, on previous occasions, after presenting important changes in its activity, the Nevado del Ruiz volcano showed a decrease in its activity before a major eruption. That is, first it registers a strong increase in its activity, then a significant decrease and, then, it produces a critical explosion.

Therefore, we reiterate that the activity of the Nevado del Ruiz volcano continues at the orange level, which indicates that there is a probability of eruption in days or weeks, rather than in the last 10 years.

To change the level and return to the yellow level, a reasonable time is required, where trends and patterns can be observed that allow us to infer a possible decrease in activity, the current activity of the volcano has not yet been shown, which is why the activity level of the Nevado del Ruiz volcano has been warned that it will remain at the orange level for several weeks. At this time, if there is an imminent explosion or an acceleration of processes indicating an explosion, the activity level will be changed to red.

We recommend that the community remain calm, follow all the instructions of the National Division for Disaster Risk Management (UNGRD) and local authorities, and pay attention to the information provided by the Colombian Geological Service on the evolution of the volcano’s condition.

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