On 31 August a lava flow extended SE from the center of the crater. During three days in late August, the 21st (middle left), 26th (middle right), and 31st (bottom left), the thermal anomaly filled the N and NW sides of the crater. On 27 July (top right) it had migrated to the center of the crater.
On 12 June (top left), the anomaly was weak and located on the SW side of the crater. Sentinel-2 infrared imagery of Ol Doinyo Lengai from 12 June through 20 September 2021 showed thermal anomalies (bright yellow-orange) in the summit crater on clear weather days. According to the MODVOLC algorithm, a total of 24 thermal alerts were detected near the summit to the N of the summit: 23 were recorded on 7 October and one was recorded on 12 October.įigure 214. After September, the anomalies continued to be detected, but at a lower frequency and strength, and clouds often obscured views of the summit. By 20 September the thermal activity had decreased in power, though a weak lava flow had migrated from the center of the crater to the NE side. The stronger anomalies filled a majority of the summit crater during late August, based on Sentinel-2 infrared satellite imagery, likely representing ongoing lava effusion originating from a central hornito (figure 214). Thermal activity increased in both frequency and strength by early August, which continued through early September (figure 213). During July, the weak anomaly was in the center of the crater.
A single weak thermal anomaly was detected in the MIROVA graph during late June, which was also visible in Sentinel-2 infrared satellite imagery on the SW side of the crater. Thermal activity increased notably during August 2021 and has been monitored using satellite data.Īctivity was relatively low during March through July, but satellite views were often obscured by weather clouds. Recent activity has been characterized by small lava flows in the summit crater (BGVN 46:04), which resumed during this reporting period of March through October 2021.
Eruptions have been recorded since the late 19th century, while the current eruption has been ongoing since April 2017. Activity primarily occurs in the crater offset to the N about 100 m below the summit where hornitos (small cones) and pit craters produce lava flows and spattering. Ol Doinyo Lengai, located near the southern end of the East African Rift in Tanzania, is known for its unique low-temperature carbonatitic lava. Ongoing crater activity with strong thermal anomalies during late August 2021
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