Subject: Activity Bulletin Nevado del Ruiz volcano.
The level of activity continues at:
Yellow activity level 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 volcano has shown seismic activity primarily related to fluid dynamics in volcanic conduits, characterized by the appearance of long period earthquakes (LP) and very long period (VLP ) and ongoing volcanic tremors episodes, low energy levels, as well as pulses of tremor, with different energy levels.
Some of these signals are associated with the gas and ash emissions. These events were mainly located in the southeast sector of the volcano and near the Arenas crater. registering new seismic signals of this type with high energy levels and ash emissions in the atmosphere are not excluded.
Further seismic activity associated with the fracturing of rocks within the volcano, which shows an increase in the number and energy released from previous weeks was recorded. Earthquakes are located mainly in the Southwest sector and to a lesser extent in North distal areas, the Northeast, Southeast, East compared to the Arenas crater and around the crater itself. The maximum magnitude recorded during the week corresponds to the earthquake registered on 23 May at 6:57 p.m. (local time) with a magnitude of 2.5 ML (local magnitude) at a depth of 3.52 km, 1.3 km north-east of Arenas crater.
The volcanic deformation measured from electronic inclinometers, global navigation satellite systems (GNSS) and satellite images to track changes in the tilt, the position and shape of the volcano (respectively), continues to show changes .
The volcano continues to emit into the atmosphere large amounts of steam and water gas, including sulfur dioxide (SO2), as it was felt by the permanent stations SCANDOAS installed in the Volcano area and satellite imagery.
On monitoring of the satellite images provided by the site Mirova, no thermal anomalies were reported during the period.
The column of gas, steam and ash reached a height of 2500 m measured from the top of the volcano, on May 22 The direction of the dispersion of the column was in line with the prevailing wind in the area, which, during the week showed the predominant direction towards the west and the northwest of the volcano.
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May 26 , 2016.Nevado Del Ruiz, Colombia :
Source : SGC