What is a 'doublet' earthquake?published at 13:39 BST 25 June
Mark Poynting
Climate and science reporter
Venezuela was hit by a “doublet” sequence of earthquakes, according to the US Geological Survey (USGS). This is where two earthquakes of a similar magnitude strike shortly after one another in a similar place.
In this case, a 7.2-magnitude earthquake was followed by a larger 7.5-magnitude quake just 38 seconds later.
The USGS says this suggests "a complex, rupture-interaction process" - effectively where one earthquake helps to trigger another one nearby.
This is different to the typical sequence of earthquakes, where a larger earthquake is followed by much smaller aftershocks.
Having two large earthquakes so close together in time is particularly unusual, but doublets aren’t unprecedented in this part of the world.
Northern Venezuela was also hit by a doublet in September 2025, according to the USGS.
The quakes were much weaker, at 6.2 and 6.3-magnitude, but still caused at least one death and more than 100 injuries, it says.
The Turkey-Syria earthquakes of February 2023, which killed more than 55,000 people, were also a doublet sequence.




























