Weekly activity report 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, the SERVICIO Geologico COLOMBIANO reports:
During the last week, the volcanic system continued to show unstable behavior. The recorded seismic activity was mainly associated with fluid dynamics in volcanic conduits, which was characterized by the occurrence of earthquakes long period (LP), short pulses of volcanic tremors and episodes of continuous tremors with different energy levels.
Some of these signs have been associated with the process of emission of ash , sometimes confirmed by the images captured by the cameras installed in the Volcano area and reports of officials of the Colombian Geological Service and the National Park Of Los Nevados (NNNP) . This seismic activity was localized mainly near the Arenas crater and in the Northwest , South and Southeast areas of the volcano. Do not rule out new episodes of these signals with higher levels of energy and emissions of ash in the atmosphere are likely to occur, which can be dispersed according to the wind conditions prevailing in the region.
Seismic activity related to the fracturing of the rock in the volcanic structure during the week was mainly in seismogenic zones of the Southeast and Northeast and to a lesser extent, scattered in Northern distal , Southwest, East and near the Arenas crater. Their depths were between 0.84 and 7.23 kilometers. The largest seismic event of the week was registered on March 18 at 18:24 (local time) with a magnitude of 1.8 ML (local scale), located in the southeast sector compared to the Arenas crater at a depth of 3.35 km.
The volcanic deformation measured from electronic inclinometers, global navigation satellite systems (GNSS) and satellite images, which record changes in the tilt, the position and shape of the volcano (respectively) during the last assessment period continues to show recorded changes.
The volcano continues to emit into the atmosphere large amounts of steam and water gas, including sulfur dioxide (SO2), as has been estimated by the permanent stations SCANDOAS installed in the Volcano area and satellite imagery.
The column of gas, steam and ash reached a height of 1,800 meters above the summit of the volcano on March 15. 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 southwest compared to the volcano.
Through the scientific-technical and instrumental analysis, it is considered that the volcano Nevado del Ruiz continues to evolve and it is possible that future events may indicate an acceleration of the process, involving greater instability of it requires amend its level of activity. While the instability of the volcano is the same for more than five years, it is essential not to get used to this behavior and be attentive to official information to be published by the Colombian Geological Service.
March 23, 2016.Nevado Del Ruiz , Colombia :
Source : SGC.
Photo : Sgc, LUNWERG EDITORES