The IG reported that inclement weather mostly prevented observations of Tungurahua from 28 October to 4 November; steam plumes were noted on 2 November. On 28 October a lahar lasting about 30 minutes descended the Vascún River to the N. Lahars caused by rain descended multiple drainages on 1 November. Blocks about 50-70 cm in diameter were reported in Juive, (about 7 km NNW), La Pampas, (about 6 km S), and Bilbao (about 8 km N). Rolling blocks up to 1 m in diameter were reported in the SW. Residents bordering the Vascún River temporarily evacuated and then returned to their homes after the rain stopped.

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)