Venezuela witnessed two massive earthquakes within 39 seconds on Wednesday. The first was magnitude 7.2 followed by another of magnitude 7.5 in nearly the same location.
This rare “doublet earthquake” phenomenon confuses scientists’ understanding of fault energy release. Typically, an earthquake is a primary shock with subsequent aftershocks. However, doublet earthquakes involve two equally strong quakes occurring in quick succession without gradual energy release via aftershocks.
Experts are still trying to understand whether the event was one powerful quake with multiple rupture phases or two closely linked events. The initial 7.2-magnitude earthquake transferred stress to surrounding rocks, which built up on an adjacent fault line and triggered the second quake.
The country’s location at the intersection of Caribbean and South American plates contributes to this instability, as these plates move against each other, storing energy for years before it is suddenly released in catastrophic form.