IG characterizes the actual activity level (visual and seismic activity) of Reventador "moderate". No major changes have been observed at the volcano in recent days. [less]

A constant seismic tremor signal of high energy accompanied the generation of a steam and ash eruption column which reached a height of 5 km above the crater during a few minutes. The ash cloud drifted to the north and then to the north-west. No significant noises or roars were heard.
Ash fell in the areas of Baños de Agua Santa, Runtún and Juive. At the ​​Tungurahua Volcano Observatory, located 14 km north west of the volcano, only slight ash fall was recorded. [less]

A new vent was detected, both on visible and thermal images, located next to the active dome on the SE flank (Ñuñurqu). The activity in this area has intensified since October, when the last aerial survey had taken place.
Extensive lava flows are descending on the SE flank of the dome and reaching the base of the cone. [less]

The crater geometry, nearly circular and 214 m in diameter, had not changed significantly since October 2011. Fumaroles were active at the E and W rim.
Thermal measurements indicated a maximum temperature of 171°C in the crater, 20°C more than in October 2011. A thermal anomaly was observed at the eastern outer rim of the crater. Near the rim of the inner crater, a 10-15 m large block with temperature of 147°C was observed, as well as other large blocks with temperatures of up to 173°C were found nearby. These blocks were probably ejected during the recent explosions. [less]

The explosion ejected incandescent blocks to distances up to 500 to 600 meters below the crater rim on the northeast side. Seismically the explosion was followed by a signal of high-energy tremor that lasted about 40 minutes.
The explosion was heard in villages near the volcano and at the volcano Tungurahua Observatory (OVT), located 14 km north-west of the volcano. [less]

The reason is a steady increase in seismic activity and gas emissions from the summit crater. In recent days, more and more, usually small earthquakes have been occurring at shallow depths under the volcano, some of them felt. A steam nd gas plume is rising from the crater to 1.5 km and sulfur smell can be noticed in nearby villages and towns.
430 000 inhabitants from the valleys of the Río Chinchina, Manizales and four other rivers have been warned of mud flows and possible floods, which could be triggered especially during heavy rains, even when there is no eruption. [less]

Starting at 07:10 local time on 9 April, a continuous tremor signal of high energy was detected and the volcano started to erupt a continous column of ash, which rose within few minutes to 2 km height and drifted to the south, and later increased to about 3 km height above the crater.
Constant rumbling noises, similar to turbines were reported. [less]

- From March 27, there have been phases of volcanic tremor pulses related probably to deep magma movements
- Since the last week, there were seismic signals interpreted with rock fracturing, i.e. dike intrusions, located west of the active crater. Similar seismic activity was observed prior to the eruptions in November 1985 and September 1989, although this time it is less energetic. [less]

A study published in 2008 revealed that between 1992 and 2006, geodetic satellite measurements recorded an ongoing 70 km wide deformation field with a central uplift rate of 1 to 2 cm/yr. This uplift, could be explained by an average magma influx of 1 cubic meters per second from a source at 17-30 km depth into a shallow reservoir. Sediment and stratigraphic studies suggest that the uplift might actually have started at the time, which would mean that the volcano has just started to be at unrest. [less]

Occasional roaring explosion sounds were heard from small to moderate explosive events. Seismic activity remains characterized by volcanic tremor episodes lasting several minutes, interspersed with tremor bursts and long-period events, which are related to fluid movements within the volcano. [less]

From 23:39 (local time) on March 19, a rapid increase of tremor was detected and observers reported roaring noises from the volcano in up to 14 km distance. About an hour after the onset of tremor reports of ash fall came from El Manzano and Choglontús.
At 00h22 today, there was an loud explosion whose cannon-shot like shock wave was heard in Choglontús, El Manzano and Puntzán. Incandescent lava bombs could be seen ejected from the summit crater and landing up to approx. 200 m distance on the upper slope. [less]

The column emission reached a maximum height of 3 km and drifted toward the west and south-west. From the Juive area, roars could be heard accompanying the eruptions.
So far, there were no reports of ashfall. [less]

An overflight on 8 March revealed intense steaming from the main crater and the presence of ash on the summit glacier, the crater rim and on the volcano's eastern flanks, probably from the phreatic explosions reported earlier since 22 Februry. The steam plume reached an inpressive 1400 m (4,500 ft) height.
In addition, a thermal anomaly can be identified in the crater and levels of SO2 emission, as well as seismic activity with tremor signals have increased. This all adds to the likelyhood of a new eruption from the volcano, which, during its infamous 1985 eruption, killed about 30,000 people by a deadly lahar in the village of Armero. [less]

Ojos del Salado at 6893 m is the highest volcano of the world, the highest mountain of Chile and the second highest mountain in the world outside the Himalaya. The climb success rate is about 25%, and climbers can face extreme conditions at the top, wind gusts of up to 200 km/h and temperatures down to -30 deg C are nothing unusual here. [less]

A second explosion took place at 09:11 (local time) and produced a strong shock wave that rattled the ground and windows in nearby areas. CLoud cover has prevented detailed observations, but with the help of thermal sensors, hot fresh deposits were detected on the flanks, suggesting they were the result of a pyroclastic flow.
In the morning, the observatory post at Cusúa reported the presence of hot deposits on the upper flank typical for fresh pyroclastic flow deposits. [less]

So far, the energy level of this increase is low compared with previous episodes of unrest, but small eruptions in the near future are possible.
The seismicity is located under the active Arenas crater at depths ranging between 0.5 and 3 km, and reached a maximum recorded magnitude of 1.4 on the Richter scale. [less]

Seismic tremor has decreased, no noises were reported nor new ash fall, suggesting that no new eruptions have taken place, although visible observations are difficult due to frequent cloud cover.
Whether this is only a short break in activity or an end of the current eruptive phase is unknown. The last notable eruption was recorded last night at about 18h00 local time, and consisted in a strong strombolian-to-vulcanian type ash explosion ejecting incandescent bombs to up to 500 m height above the crater and to about the same lateral distance in all sides, showering the upper flanks with glowing ejecta, especially the upper northwestern and western flanks. [less]

Between 1-15 Feb, a total of 350 seismic events or about 21 per day on average were registered, including 233 long-period signals interpreted to be caused by fluid movements, 8 so-called tornillo long-period quakes, one of which lasted 148 seconds, and 3 pulses of volcanic tremor (possibly indicating magma movements).
Visible activity consists in pulsating columns of gasses reaching 50-250 m height from fumaroles. [less]

More ash eruptions have occurred over the following day and 3 small pyroclastic flows were reported. Authorities have raised the alert level to orange and opened emergency shelters for residents of the communities of Cusúa, Bilbao und Penipe located in the most vulnerable areas on the N and W flanks of the volcano. [less]

Sangay is one of the most active volcanoes in Ecuador, in frequent activity since the 17th century when it was discovered. However, due to its very remote location, at the eastern end of the Andes cordillera, its monitoring is limited to occasional field observations and observations by aircraft and from satellite. [less]

A lahar descended the Achupashal drainage, carrying blocks up to 1 m in diameter, and caused the road to Baños (9 km N) to be closed. Cloud cover prevented observations of the crater. On 13 January ash-and-gas emissions were observed, and ash plumes rose as high as 7 km (23,000 ft) a.s.l. and drifted W. Ash-fall was reported in Palitahua (6 km SSW) and roaring noises were heard in Cusúa (8 km NW) and Manzano.
On 14 January ash emissions rose 500 m above the crater and drifted WSW; ashfall was reported in Choglontus, Palitahua, and Manzano. Clouds obscured views on 15 January; however ashfall was reported in Palitahua and Manzano. Lahars descended drainages in Juive (NW) and Pondoa (N), carrying blocks 10-20 cm in diameter. [less]