To recall, if necessary, it is always active thirty years after his last deadly eruption, the Nevado del Ruiz present a seismic activity reflecting its instability.
Increasing of LP earthquakes, associated with fluid dynamics in volcanic conduits, and short tremor are reported on 4 and 5 November in the NW and SW sectors of Arenas crater at a depth of between 2.85 and 8, 33 km. The highest magnitude 3.1 ML was reported on November 8 at 10:48 p.m. local at 3.79 km deep.
Some earthquakes accompanying gas emissions, which are detected high concentrations of sulfur dioxide, and ashes.
On 14 November, tremor pulses are always record, one was accompanied at 5:37 loc., by brown ash emission amount to 1,300 meters before dispersing towards NO.
The volcano alert level remains at Amarillo.
The Colombian Geological Service now commemorates the 30th anniversary of the eruption of 1985, and the disaster of Armero who made 25,000 dead. "Lecciones de para el mundo y Colombia disaster. La historia debe ser para mejor futuro construir a base. "
Source: OBSERVATORIO VULCANOLÓGICO Y SISMOLÓGICO OF MANIZALES
You can find a description of the 1985 eruption of this blog : Les Andes - Zone volcanique nord : Colombie - Nevado del Ruiz et la tragédie d'Armero.
Another birthday, closer and less consistent, with the eruption of Pavlof, on red alert 15 November 2014, with the emission of a plume of ash reaching 25,000 ft / 7,600 m.asl. On 16 November, the plume was spotted at 30,000 ft / 9140 m. before moving to the NW of the Bering Sea.
On Java, the eruption of Gunung Bromo is confirmed.
After a visit from October 18 to 20, Oystein Lund Andersen write on its website an increasing activity , characterized by gaseous emissions with an high sulfur content, together with a constant rumbling noise. These sulfur emissions have lined the inside of the crater, which had a greenish-yellow color.
Great photos of this tour are on: http://www.oysteinlundandersen.com/bromo-and-the-tengger-caldera/2015-october/
This Nov. 15, he still reports a turbulent plume of ash and gas, accompanied by rumbling.
Source: Oystein Lund Andersen