25/06/2015. Nevado Del Ruiz, Colombie : the volcanic system remains unstable.

25/06/2015. Nevado Del Ruiz, Colombie : the volcanic system remains unstable.


Subject: Activity Bulletin of Nevado del Ruiz volcano.

Activity level yellow or (III): changes in the behavior of volcanic activity.

Regarding the monitoring of the activity of 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 southeast of it and was characterized by the recording of several episodes of volcanic tremor, associated with the movement of fluids and gases and ash emissions into the atmosphere.
In addition, was continued the recording of seismic activity associated with the fracturing of the rock in the volcanic structure. Earthquakes are located mainly in the northeast and to a lesser extent, in the crater to the south of it, at depths between 0.5 and 5.1 km. The maximum magnitude recorded during the week was 2.6 ML (local magnitude), corresponding to an earthquake in the north of Arenas crater, which took place on June 18 at 06:30 (local time) at depth of 3.31 km. An increase in seismic activity associated with fracturing of the rock is characterized, registered on June 18 These events were located in the northeast of the Arenas crater. Continuous volcanic deformation show some changes.

The volcano, in the atmosphere, continues to emit significant quantities of water vapor and gases, including sulfur dioxide (SO2). The gas and steam column reached a height of 1600 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 towards the northwest sector of the volcanic edifice.

Nevado Del Ruiz, Colombie :

Source : SGC

Photo : SGC , La Patria

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