Internal activity level of the Nevado del Ruiz volcano.
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:
During the last week, the volcanic system continued to show unstable behavior. The recorded seismic activity was mainly associated with the fracturing of the rock in the volcanic structure. This type of seismicity was located mainly in the Southwest areas, Northeast, Southeast and North distal Arenas crater. The depths of earthquakes during the week were between 1.3 and 7.9 kilometers. The maximum recorded was magnitude 3.2 ml (local magnitude), corresponding to an earthquake on January 18 at 3:05 (local time), located in the southwest area of ??Arenas crater at a depth of 2.1 km.
Enormous plume from the crater Arenas of the volcano Nevado del Ruiz
The height of the plume is estimated at two kilometers. The picture also shows the great loss of ice on top of the mountain.
Image captured exclusively by the RCN Air Patrol. Seismic activity in the last weeks on the volcano was persistent and alert level 3 is maintained.
As for seismic activity related to fluid dynamics in volcanic pipes, this type of seismicity was characterized by the appearance of continuous tremors and earthquakes long period (LP). These two types of signals were mainly located near the Arenas crater and areas in South and Southeast of the volcano. The continuous tremor signal had varying levels and low energy. Do not rule out that new episodes of high levels of energy of the signal and the output of gas and ash in the atmosphere may occur.
These processes were accompanied by thermal anomalies, which were recorded by monitoring satellite images provided by different organizations, such as the Italian universities of Turin and Florence (Mírová portal). These moderate temperature anomalies were recorded on 13, 16 and 18 January, and have been identified near the Arenas crater, confirming the instability of the Nevado del Ruiz volcano and confirming that the process continues to evolve.
The volcanic deformation measured from electronic inclinometers, global navigation satellite systems (GNSS) and satellite images, which record changes in tilt, position and shape of the volcano (respectively) in the last evaluated period, showed no significant changes.
The volcano continues to emit into the atmosphere large amounts of water vapor and gases, including sulfur dioxide (SO2), as has been estimated by the SCAN DOAS permanent stations installed in the volcano area and satellite imagery.
The column of gas, steam and ash reached a height of 650 meters above the summit of the volcano on January 14. The direction of the dispersion of the column is in line with the regime of prevailing winds in the region, who, during the week showed a predominant direction towards the west and northwest of the volcano.
January 22 , 2016. Nevado Del Ruiz , Colombie :
Source : SGC