Brief volcanic review.

During the last week,  the seismic activity of the Nevado del Ruiz, Colombia, is typical volcano-tectonics, associated with fracturing of rock inside the volcano. Earthquakes are located mainly in the north-northeast of the crater between 500 meters and 7,500 meters deep. In relation to the dynamics of fluids in pipes, low energy seismic activity and tremor episodes marks the south of the Arenas crater.
The Nevado del Ruiz continues to emit large amounts of steam and gas with a column amount up to 1,800 meters above the volcano, sometimes loaded with a little ash.

Nevado del Ruiz - earthquakes of 14/04/2015 - Doc. SGS / Observatorio Manizales

On April 14, at 7:39 p.m., volcanic tremor drive, followed by continuous tremor is detected in connection with an emission of ash and a possible drop of them on the northwest of the volcano, because unconfirmed observation conditions.
The camera in the Piraña sector shows a column of gas and ash morning of April 15, 2015.
Source: SGS / Observatorio Manizales
 

Nevado del Ruiz - plume of gas and ash from 04.15.2015 - photo SGS / Observatorio Manizales

In Sinabung / Sumatra, the growth of the lava lobe continues.
Lahars characterized by a high concentration of blocks are recorded on 15 April. (See also article of yesterday)
 

Sinabung from Tiga Pancur - photo Sadrah ps 04/15/2015

Sinabung - the lahar 15/04/2015 - photos endrolew @

In Ecuador, on 15 April at 16:08, Tungurahua experienced an explosion that was accompanied by a column of ash rising to 3,000 meters above the crater. An episode of tremor followed the explosion, and a continuous emission of ash 2,000 meters above the crater, continuing until at least 17.20.
Source: IGEPN
 

The Tungurahua 15.04.2015 / 4:20 p.m. - photo José Luis Espinosa-Naranjo

In Peru, the Ubinas continues his ash emissions ... raising fears of new lahars in inclement weather (see article of yesterday).
Source: webcam OVI / INGEMMET
 

Ubinas - plume of gas and ash, with discharge on the sides - 04.15.2015 / 10:07 - webcam OVI / INGEMMET

In Mexico, Colima continues to regularly produce explosions, which are accompanied by ash falls on the Jalisco 15.04
 

Explosions in the Colima on14.04 at 12:32 and on 15.04 at 12:16 - Webcams Mexico / Retuit

To conclude this brief review of current events, a beautiful picture of Etna in the snow a few days ago, taken by Italian astronaut Samantha Cristoforetti on board the ISS.
 

Etna in snow - photo Sam Cristoforetti / ISS / 2015