Istanbul: A series of significant earthquakes across Latin America and Asia in 2026 has raised concerns about a perceived increase in global seismic activity. Notable quakes include a magnitude 7.4 event in western Colombia on August 10 and a magnitude 7.7 earthquake in Indonesia's Flores Sea four days later, leading to a tsunami and numerous aftershocks. These incidents followed earlier earthquakes in the Philippines, Venezuela, and Mexico.
According to Anadolu Agency, experts clarify that the apparent surge is not indicative of increased global seismic activity. Richard Styron, a senior active faults specialist at the Global Earthquake Model Foundation, emphasized that the number of magnitude 7+ events this year aligns with the expected average of roughly 16 such occurrences annually. The U.S. Geological Survey supports this, indicating that the world typically experiences about 15 magnitude-7 earthquakes and one magnitude-8 or greater event each year.
Dr. Margarita Segou from the British Geological Survey concurs, stating that 2026 falls within the normal variation of annual seismic activity. She notes that regional patterns can differ due to unique tectonic settings, as evident in places like Indonesia and Colombia.
The perception of increased activity is often strengthened when major earthquakes occur in quick succession. Styron explains that while this pattern may appear clustered, it is often coincidental, rather than indicative of a coordinated process. He refers to this as a Poisson process, where random, independent events can seem clustered.
Segou highlights that similar concerns have arisen in the past, such as in 2014, when a spate of major earthquakes also fell within statistical expectations. The recent events have gained attention due to their impact on populated areas and the resulting secondary hazards. The Colombian earthquake, for instance, was the country's largest recorded event of the 21st century, affecting over 1,200 population centers.
The concept of 'triggered seismicity' is crucial for understanding aftershocks and stress transfer following a major earthquake. Segou emphasizes that aftershocks can further damage affected areas, and operational earthquake forecasting helps estimate the likelihood of such events. Styron adds that the geographical range of triggering typically scales with the earthquake's magnitude.
The improved detection of earthquakes through advanced technology, such as machine learning and artificial intelligence, also contributes to the perception of increased seismic activity. These tools enhance the detection of smaller quakes, offering significant scientific insights, although they do not account for the perception of more major earthquakes.
Ultimately, the risk from earthquakes arises from exposure and vulnerability rather than the earthquakes themselves. Factors such as the location, depth, and resilience of infrastructure determine the impact of seismic events on human populations.