2023-06-06 03:14:19
From the monitoring of the activity of the NEVADO DEL RUIZ VOLCANO, the MINISTRY OF MINES AND
ENERGÍA through the COLOMBIAN GEOLOGICAL SERVICE (SGC) informs that:
From 9:00 am yesterday (June 4) until the time of publication of this bulletin, the seismic activity associated with rock fracturing inside the volcanic edifice showed a slight increase in the number of earthquakes and in seismic energy. released, compared to the day before (June 3).
This seismicity was located mainly in the northeastern sector, at a distance between 3 and 4 km from the crater, with depths ranging between 4 and 5 km. The maximum magnitude recorded was 1.3, corresponding to the earthquake registered today at 03:50 am, located 3 km northeast of the Arenas crater, at a depth of 5 km from the top of the volcano. Added to this, yesterday an earthquake was recorded in the Arenas crater at 09:34 am, of magnitude 1.2 and 2 km deep.
The seismicity related to the movement of fluids inside the volcanic conduits remained at similar levels in the number of earthquakes and had a slight decrease in the seismic energy released in relation to June 3. Some of the seismic signals were associated with pulsatile ash emissions confirmed through the web cameras used for volcanic monitoring.
On the other hand, the variations in the degassing of sulfur dioxide and the release of water vapor from the crater into the atmosphere continued. The maximum height of the column of gases and steam was 500 m measured from the top of the volcano and the direction of dispersion of the column prevailed towards the northwest.
The activity of the Nevado del Ruiz volcano continues to be very unstable. Although several days have passed in which the seismic activity, in general, has decreased compared to previous weeks, it is important to remember that this does not imply that the volcano has returned to its normal levels of activity, so it is recommended not to get used to it. to these oscillating changes in activity and think that it is a normal behavior of the volcano.
Satellite detection of significant thermal anomalies at the bottom of the crater indicates the presence of very hot material near the surface. It is very important to take into account that the recurrence of ash output, sometimes pulsating and sometimes more continuous, the persistence of a slight deformation of the terrain, as well as the variations in the output of sulfur dioxide, indicate that the volcano could still make a major eruption in days or weeks.
As we have mentioned, on previous occasions, after presenting important changes in its activity, the Nevado del Ruiz volcano has shown a decrease in its activity before a major eruption. That is to say, first it registers a strong increase in its activity, then a considerable decrease and, later, it makes an important eruption.
Therefore, we reiterate that the activity of the Nevado del Ruiz volcano continues at ORANGE LEVEL, which indicates that there is a probability that in days or weeks it will erupt more than it has in the last 10 years.
To change the level and return to the Yellow level, a prudential time is required where trends and patterns can be observed that allow us to infer the possible decrease in activity, aspects that the current activity of the volcano still does not show, which is why it is warned that the The activity level of the Nevado del Ruiz volcano will remain at ORANGE LEVEL for several weeks. During this time, in the event of an acceleration of processes suggesting an imminent eruption or the eruption itself occurring, the activity level will be changed to Red.
We recommend that the community remain calm, follow all the instructions of the National Unit for Disaster Risk Management (UNGRD) and local authorities, and be attentive to the information provided by the Colombian Geological Service on the evolution of the state of the volcano.
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