Aerial view of Nabuyatom crater south of Lake Turkana, Kenya
Martin Harvey/Alamy
Climate change in East Africa has led to a decrease in water levels in Kenya’s Lake Turkana, resulting in a series of earthquakes and volcanic activities over thousands of years. This phenomenon highlights the potential hazards of climate change on other bodies of water globally as weather patterns continue to shift.
Known as the cradle of humanity, Lake Turkana has yielded fossils dating back up to 4.2 million years, showcasing the co-existence of various hominin species. As the lake has gradually shrunk due to changing climatic conditions, the region has experienced increased seismic activity, adding to the challenges faced by early human ancestors.
Christopher Scholz from Syracuse University suggests that the drying climate and reduced water levels in Lake Turkana have likely triggered more frequent earthquakes and volcanic eruptions in the area. Situated in the Great Rift Valley between Kenya and Ethiopia, the lake, once surrounded by lush grasslands and forests, has witnessed a significant decrease in water levels between 4000 and 6000 years ago.
By analyzing sediment layers in lakebed cores and conducting sonar imaging at fault lines, Scholz and his team observed an acceleration in fault slipping as the climate became drier. This increased slipping rate, coupled with reduced lake load, has contributed to heightened seismic activity in the region.
Furthermore, computer simulations indicate that the decreased water mass beneath Lake Turkana has facilitated the upwelling of magma, leading to volcanic eruptions. This phenomenon, akin to the release of pressure from a champagne bottle, underscores the interconnectedness of climate change and geological events.
While recent increases in rainfall have raised water levels in Lake Turkana, it will take millennia for these changes to significantly mitigate earthquake and volcanic risks. The study emphasizes the importance of factoring in changing water levels when assessing seismic hazards and calls for proactive measures to address earthquake risks in dam construction and removal projects.
Ken Macdonald from the University of California, Santa Barbara, highlights the need for governments to incorporate seismometers in infrastructure projects to monitor potential geological impacts of climate change. By understanding the complex interplay between climate, water levels, and geological activity, we can better prepare for future challenges posed by a changing environment.
Topics:
