IG reported moderate volcanic activity including explosions, long-period earthquakes, and tremor at Tungurahua during 10-16 September. On 10 September a minor ash plume was visible drifting SE from the summit. Ahfall was reported in the area of Quero (20 km NW) and Tisaleo (29 km NW) on 10 September. In the morning of 11 September, small explosions were reported that generated rockfalls on the flanks. Moderate rainfall on 12 and 15 September generated lahars within the NW drainages of Achupashal and La Pampa. Light ashfall was reported from Cusúa (~8 km NW of the summit) on 16 September and, during clear viewing conditions, snowfall was noted on Tungurahua’s upper flanks. Cloudy conditions frequently obscured views of the summit.

Geological Summary. Tungurahua, a steep-sided andesitic-dacitic stratovolcano that towers more than 3 km above its northern base, is one of Ecuador's most active volcanoes. Three major edifices have been sequentially constructed since the mid-Pleistocene over a basement of metamorphic rocks. Tungurahua II was built within the past 14,000 years following the collapse of the initial edifice. Tungurahua II collapsed about 3,000 years ago and produced a large debris-avalanche deposit to the west. The modern glacier-capped stratovolcano (Tungurahua III) was constructed within the landslide scarp. Historical eruptions have all originated from the summit crater, accompanied by strong explosions and sometimes by pyroclastic flows and lava flows that reached populated areas at the volcano's base. Prior to a long-term eruption beginning in 1999 that caused the temporary evacuation of the city of Baños at the foot of the volcano, the last major eruption had occurred from 1916 to 1918, although minor activity continued until 1925.

Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)