A new study debunks claims that a magnitude 4.5 earthquake in Iran was a covert nuclear weapons test, as widely alleged on social media and some mainstream news outlets in October 2024, a period of heightened geopolitical tensions in the Middle East.

“There was a concerted misinformation and disinformation campaign around this event that promoted the idea this was a nuclear test, which is not something you often see happen with an earthquake.”

Using publicly available data from seismic monitoring stations, the researchers concluded that the earthquake originated along a gently sloping fault where Earth’s crust was being deformed by the collision between Arabia and Eurasia. The process aligns with the geophysical forces that characterize the region’s tectonically active interior and rules out any connection to a particularly unusual source or nuclear test, the study concludes.