Did a nuclear test trigger 4.3 magnitude earthquake in Iran? Timing sparks speculations on social media

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• 4.3 magnitude earthquake strikes Gerash, southern Iran
• Quake depth was about 10 km, typical for tectonic activity there
• UN nuclear watchdog says no nuclear sites in Iran were damaged

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A magnitude 4.3 earthquake struck the Gerash region in southern Iran, according to the U.S. Geological Survey (USGS). The tremor occurred at a depth of around 10 kilometres (6.21 miles), the agency said.

Gerash lies in Iran’s Fars province, an area that frequently experiences earthquakes due to its position along the Zagros fold and thrust belt, where the Arabian and Eurasian tectonic plates collide. This region is considered one of the most seismically active zones in the Middle East, and earthquakes in the magnitude-4 range are relatively common.

The timing of the quake has sparked speculation on social media, particularly given the ongoing conflict involving Iran, Israel and the United States. Some suggested the tremor could be linked to a covert underground nuclear test.

Underground nuclear detonations produce distinct seismic signatures that differ from natural earthquakes, including stronger primary waves and much weaker secondary waves. The Gerash event, recorded at a depth of about 10 kilometres, aligns with typical tectonic activity in the region.

The speculation has also been fuelled by seismic activity elsewhere. Over the past week, more than 100 minor earthquakes have been recorded in the US state of Nevada, prompting online theories about possible nuclear activity.

The tremors were detected near the Tonopah Test Range, a highly classified military testing facility that is sometimes informally associated in popular discourse with the so-called “Area-52.” The cluster of small quakes has triggered discussion across international media and strategic circles, particularly as the United States intensifies its military operations against Iran.

The head of the UN's nuclear watchdog said on Monday his agency has "no indication" that any nuclear installations have been damaged or hit in Iran following US and Israeli strikes on the country.

Iran's ambassador to the International Atomic Energy Agency (IAEA) Reza Najafi said the key nuclear site Natanz had been attacked, without specifying further.

A 12-day war in June last year saw Israeli and US strikes on key Iranian nuclear facilities, including Natanz, which IAEA inspectors have not been given access to visit since then.