USGS
12th October 2011, 22:20
Based on information from IG, the Washington VAAC reported that on 7 October an ash plume from Tungurahua rose to an altitude of 6.1 km (20,000 ft) a.s.l. and drifted W. Ash was not observed in satellite imagery.
Source: Washington Volcanic Ash Advisory Center (VAAC)
More... (http://www.volcano.si.edu/reports/usgs/index.cfm?wvarweek=20111005#tungurah)
Source: Washington Volcanic Ash Advisory Center (VAAC)
More... (http://www.volcano.si.edu/reports/usgs/index.cfm?wvarweek=20111005#tungurah)