Magma influx explains short-lived bulge at Tanzania's Ol Doinyo Lengai volcano

In September 2026, researchers from Virginia Tech announced that a brief bulge in the landscape surrounding Tanzania's Ol Doinyo Lengai volcano was caused by the influx of about 1 million cubic meters of magma into an existing magma reservoir located roughly 3 kilometers beneath the surface. The team, led by Dr. Sarah Stamps, published their findings in the journal Frontiers in Earth Science.

According to Stamps, the amount of magma involved is relatively minor and poses no significant threat. However, the discovery underscores the effectiveness of Virginia Tech's early-warning system for detecting volcanic activity. The researchers emphasize that while the current intrusion is not a cause for alarm, continued monitoring is crucial to understanding the behavior of this highly active volcano.

Ol Doinyo Lengai is known for its alternating pattern of effusive and explosive eruptions. While the recent magma injection is not expected to lead to an explosive eruption in the near future, the researchers stress the importance of ongoing geodetic and seismic monitoring. By tracking surface deformation and earthquake activity, scientists hope to identify patterns that may precede more violent eruptions in the future.

The team has been collecting data on the volcano for over a decade, using ground-based GPS systems and seismic stations to measure subtle changes in the Earth's crust. These observations have allowed them to build a detailed picture of how magma movements underground correspond to surface phenomena, ultimately aiding in the prediction of potentially hazardous events.