Weekly bulletin of activity of the volcano Nevado del Ruiz, from 27 July to 3 August 2015 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 SERVICIO Geologico COLOMBIANO through the OBSERVATORIO VULCANOLÓGICO Y SISMOLÓGICO OF MANIZALES, informs that:
During the last week, different monitoring parameters show that the volcanic system remains unstable. Seismicity was mainly associated with fluid dynamics in volcanic conduits. This activity is mainly located in the crater, east and south of it and was characterized by the recording of multiple episodes of volcanic tremor, associated with the movement of fluids, gases and emissions of ash in the atmosphere.
In addition, continued recording of seismic activity associated with the fracturing of the rock in the volcanic structure. Earthquakes are located mainly in the north, the south, southeast and into the crater at depths ranging between 0.8 and 6.2 kilometers. The maximum magnitude recorded during the week was 1.4 ML (local magnitude), corresponding to an earthquake located in the Arenas crater, which took place on August 2 at 10:32 p.m. (local time) at a depth of 1 , 2 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 maximum height of 400 meters above the summit of the volcano. It was observed white and sometimes gray, because of the presence of ash. The direction of dispersion of the gas column was in harmony with the wind regime, which remained mainly on the western side of the volcanic edifice.
On 6 August, an increase of tremor stands at 8:39 local time; it accompanies a rising ash plume of 700 meters, filmed by webcams, with an repercussions on the ONO sector, near Manizales, Villamaria, Cinchina, Santa Rosa and Pereira.
August 08, 2015 . Nevado Del Ruiz, Colombie :
Source : SGC. Blog Bernard Duick.
Photo : SGC