9J (2019-2020): Seismic and Infrasound Networks to study the volcano Oldoinyo Lengai

• Institute for Geosciences - Goethe University, Germany

Oldoinyo Lengai in the North Tanzanian Divergence is the only active natrocarbonatite volcano world-wide and presents an important endmember magmatic system in a young rift segment of the East African Rift System. This volcano typically experiences long-duration episodes of natrocarbonatitic effusions with intermittent short-duration explosive eruptions. To better understand the role of the stress interactions and magma plumbing on the eruptions dynamics, this study aims to constrain the subsurface magmatic architecture of Oldoinyo Lengai, and a zone of ongoing seismicity and intrusive activity below the extinct 1 Ma-old Gelai shield volcano and active Naibor Soito monogenetic cone field. In February 2019, we installed a dense 22 station seismic network and 10 station array closely situated around the active Oldoinyo Lengai edifice. We use a combination of Trillium Compact and Mark L-4C-3D seismometers and DATA-Cube3 data loggers.

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