Ol Doinyo Lengai, Tanzania

Based on a pilot observation, the Toulouse VAAC reported that an ash plume rose to an altitude of 12.2 km (40,000 ft) a.s.l. on 13 March. The plume was not confirmed using satellite imagery. A plume at an altitude of 13.7 km (45,000 ft) a.s.l. was observed on satellite imagery on 16 March.

Source: Toulouse Volcanic Ash Advisory Center (VAAC) - “Report provided courtesy of the Smithsonian’s Global Volcanism Program and the US Geological Survey’s Volcano Hazards Program.”