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]

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]

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]

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]

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]

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]