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Ash and bombs dating from 2007 and more recent eruptions were abundant on and in the the N crater ash cone. Erosional rills extended from the rim down the ~60-degree slope to the vertical wall drop off.The N portion of the Ol Doinyo Lengai pit crater, 4-5 July 2014. Outside the crater, ~30 m below the rim near the ascent trail, a ~30 meter long by 1-m-wide crack ran upslope.Ol Doinyo Lengai (Fred Belton) 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. The plume was not confirmed using satellite imagery.

Erosion was most noticeable where the near-vertical walls met the slope to the rim.

Inside the pit, erosion appeared at the boundaries between layers.

that possibly contained ash was detected in satellite imagery on 11 March. Toulouse Volcanic Ash Advisory Centre (VAAC) According to Frederick Belton's Ol Doinyo Lengai website, a visitor reported a large plume accompanied by a "bang" during 26-27 February.

The Toulouse VAAC reported that a pilot observed an ash plume that rose to an altitude of 10.7 km (35,000 ft) a.s.l. Another possible ash plume rose to the same altitude on 28 February and drifted SW.

Based on a SIGMET, pilot reports, and observations of satellite imagery, the VAAC reported that eruption plumes possibly containing ash rose to altitudes of 10.7-13.7 km (35,000-45,000 ft) a.s.l. Ol Doinyo Lengai (Fred Belton); Toulouse Volcanic Ash Advisory Centre (VAAC) The Toulouse VAAC reported that a plume from Ol Doinyo Lengai was observed by pilots on 21 February and rose to an altitude of 18.3 km (60,000 ft) a.s.l.

Based on a Significant Meteorological Information (SIGMET) report, an ash plume rose to an altitude of 14 km (46,000 ft) a.s.l. Toulouse Volcanic Ash Advisory Centre (VAAC) The Toulouse VAAC reported that an ash plume from Ol Doinyo Lengai was observed by pilots on 15 February and rose to an altitude of 11.6 km (38,000 ft) a.s.l.

The cracks, eruptive vigor, and other features suggested instability of the N crater and a resulting risk to climbers.

The crater was observed from a portion of the W rim where there was a narrow (80 cm) path (figure 173).

This report also includes a description of the 4-5 July 2014 visit by a scientific team provided by Tobias Fischer.

Except for the Fischer narrative, other visitor observations were abstracted from the Ol Doinyo Lengai website of Frederick Belton.

They also noted a cone-shaped gray hornito on the middle of the floor and a new black lava flow to the S.

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