RiftVolc - Past, Present and Future Volcanism in the Ethiopian Rift

Abstract

SEIS-UK provided a loan of 37 broadband seismic systems (12 x ESPD and 25 x 6TD) for deployment in Ethiopia during February 2016 until October 2017. The network covers Corbetti, Aluto and Tulu-Moye volcanoes, as well as the eastern margin the Ethiopian rift. The instruments recorded continuously at 50 samples per second, with relatively minor data losses due to equipment problems. The dataset has been archived in the SEIS-UK data management system and with IRIS (Incorporated Research Institutions for Seismology. We have analysed the distribution and magnitudes of seismicity during the entire experiment at Tulu-Moye and Corbetti volcanoes, as well as solved for focal mechanisms, 1D velocity model inversion, and signal frequency content. In addition, we have analysed earthquake locations and focal mechanisms for an earthquake swarm in January 2017 on the eastern margin of the rift valley. The data is also soon to be incorporated into an inversion for the S-wave velocity model of the crust and upper mantle beneath Ethiopia.