Report on Tungurahua (Ecuador) — 26 March-1 April 2008
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 26 March-1 April 2008
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2008. Report on Tungurahua (Ecuador). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 26 March-1 April 2008. Smithsonian Institution and US Geological Survey.
1.467°S, 78.442°W; summit elev. 5023 m
All times are local (unless otherwise noted)
IG reported that although visual observations were occasionally limited due to cloud cover, ash-and-steam plumes from Tungurahua were spotted and rose to altitudes of 6-8 km (19,700-26,200 ft) a.s.l. during 25 March-1 April. Ash plumes drifted SW, W, and NW and were intermittently produced by explosions; ashfall was reported in areas downwind during 25 and 27-28 March. On 25 March, explosions propelled incandescent blocks from the summit that fell onto the flanks. Explosions also vibrated doors and windows in areas as far as 13 km away on 26 March and produced an ash plume to an altitude of 4 km (13,100 ft) a.s.l. on 27 March.
Geologic Background. 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 itself collapsed about 3000 years ago and produced a large debris-avalanche deposit and a horseshoe-shaped caldera open to the west, inside which the modern glacier-capped stratovolcano (Tungurahua III) was constructed. 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.