phys.org
Ancient crustal weaknesses contribute to modern earthquakes in West Africa, study finds
Though it was the site of active tectonics 140 million years ago, today, the coast of West Africa is a passive margin, far from an active tectonic plate boundary and thought to be seismically quiet. So scientists don't fully understand why the region is experiencing a growing number of earthquakes between magnitudes 2 and 5. The lack of widespread seismic monitoring stations across the region presents a major challenge.