Nevado Del Ruiz , Colombia : a slight decrease in the seismic activity.

Nevado Del Ruiz , Colombia : a slight decrease  in the seismic activity.

Weekly bulletin of activity of the volcano Nevado del Ruiz, from June 28 to July 4, 2016

The level of activity continues at:
Activity level Yellow or (III): changes in the behavior of volcanic activity.

Regarding the monitoring of the activity of the Nevado del Ruiz volcano, the Colombian Geological Service reports that:

During the last week, the Nevado del Ruiz presented , compared to the previous week, a slight decrease both in the seismic activity associated with the fluid dynamics in volcanic conduits and the seismicity related to the fracturation of the rock inside the volcano.

Earthquakes associated with the fracturing of the rock inside the volcano, were mainly in the seismogenic sources of the proximal and distal of the North, Nor-East and to a lesser extent, in the South-West, the West and near the Arenas crater at depths ranging from 0.8 to 8.3 km. The earthquake of greatest energy was recorded on July 2 at 4:23 (local time) with a maximum magnitude of 1.2 ML (local magnitude) at a depth of 5.2 km, and located in the area East- southeast of the volcano.

Seismic activity related to fluid dynamics in volcanic conduits, was characterized by the appearance of long period earthquakes (LP) and very long period (VLP), pulses of tremor and multiple earthquakes of fluid with different energy levels.

Some of the seismic signals have been associated with the processes of ash emissions into the atmosphere. A slight increase of the recording pulses of tremor with significant energy levels and a decrease in the recording episodes of continuous volcanic tremors , these latter having continued to have low energy levels, is highlighted. As for the location of this type of seismicity, it was mainly recorded in the crater, next to this sector and in the South and Southeast of the volcano area. The registration of new seismic signals of this type with higher levels of energy and emissions of ash in the atmosphere, which can be dispersed depending on wind conditions in the region is not excluded.

The volcanic deformation measured from electronic inclinometers, global navigation satellite systems (GNSS) and satellite images to track changes in the tilt, the position and the shape of the volcano, respectively, continued to record changes.

The volcano continues to emit into the atmosphere large amounts of water vapor and gases, including sulfur dioxide (SO2), which is distinguished as it was estimated by the permanent stations SCANDOAS installed in the volcano area and satellite imagery. In the monitoring of the satellite images provided by the site Mirova, no thermal anomaly has been identified.
The column of gas, steam and ash, from time to time, reached a maximum height of 850 meters above the summit of the volcano, on June 28 The direction of the dispersion of the column was in line with the prevailing wind in the area, which during the week showed a predominant direction towards the northwest of the volcano.

 

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July 06 , 2016. Nevado Del Ruiz , Colombia :

 

Source : SGC

Photos : Archives SGC

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