Volcano Activity Bulletin Nevado del Ruiz, August 10 to August 17, 2015.
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 SERVICIO Geologico COLOMBIANO through the OBSERVATORIO VULCANOLÓGICO Y SISMOLÓGICO OF MANIZALES, reports that:
During the last week, the seismicity related to fluid dynamics process in the volcanic system remains predominant; which shows the instability of the volcano for some time, as evidenced by the different volcanic monitoring parameters. This activity is mainly located in the Arenas crater, east, south and southeast of it, and was characterized by the recording of multiple episodes of volcanic tremors, which are associated with the movement of fluids , gases and ash emissions into the atmosphere.
In addition, has continued the recording of seismic activity associated with the fracturing of the rock in the volcanic structure. Earthquakes are located mainly in the northwest of the volcano and, in lesser amounts, in the Northeast, Southwest; at depths between 2.2 and 6.7 kilometers. The maximum magnitude recorded during the week was 1.4 ML (local magnitude), corresponding to an earthquake located 1.7 km north-east of Arenas crater, which was held on August 15 at 4:06 p.m. (local time) at a depth of 3.77 km. Continuous volcanic deformation show some changes.
The volcano continues to emit into the atmosphere of significant amounts of water vapor and gases, including sulfur dioxide (SO2). The gas and steam column reached a height of 1,000 meters above the summit of the volcano, and is sometimes seen with gray tones due to the presence of volcanic ash. The direction of the dispersion of the column was in harmony with the wind regime, which remained mainly to the western sector of the volcanic structure.
August 20, 2015 . Nevado del Ruiz, Colombie :
Source : SGC ( http://www2.sgc.gov.co/ )