At least 235 people are confirmed dead following a rare “doublet” earthquake event that struck Venezuela’s northern coast this week. The disaster involved a 7.2-magnitude tremor followed just 39 seconds later by a 7.5-magnitude shock, according to the US Geological Survey (USGS). The dual ruptures caused widespread building collapses in Caracas and the coastal region of La Guaira, leaving approximately 4,300 people injured and thousands missing, officials report.
What triggers a doublet earthquake?
Doublet earthquakes occur when two tremors of similar magnitude strike in close proximity within a short timeframe. Christine Goulet, director of the USGS earthquake science centre in California, notes that these events indicate a complex fault structure rather than a standard main shock followed by smaller aftershocks. In the case of Venezuela, the quakes originated along the Bocono fault, which stretches 500km along the Andes. The rupture occurred where the Caribbean and South American tectonic plates meet, sliding past one another horizontally in a movement known as shallow strike-slip faulting.
The movement along the Caribbean and South American plate boundary is estimated at 2cm per year, a rate of displacement that Christine Goulet of the USGS compares to the San Andreas fault.
How do current casualties compare to historical events?
While the recent death toll of 235 is significant, it remains lower than the catastrophic 1812 earthquake along the same Bocono fault system, which killed an estimated 30,000 people. According to USGS records, five earthquakes of magnitude 7 or higher have hit northern Venezuela or near the coast since 1900. In contrast to the recent event, the 1967 magnitude 6.6 quake killed hundreds of people, with José Vitriago reporting that the recent doublet “was horrible, horrible”.
Why is Venezuela’s lack of a warning system a concern?
Venezuela currently lacks an early earthquake warning system capable of detecting the first waves of an earthquake to alert the public before shaking begins. Experts point to this as a critical vulnerability in the region’s disaster preparedness. Because scientists cannot predict earthquakes, the USGS warns that residents should prepare for continued activity. There is a 99% probability of at least one magnitude 4 aftershock within the coming week, and a 24% chance of a magnitude 6 aftershock, according to the agency’s latest projections.
Pro tips for seismic safety
- Drop, Cover, and Hold On: If you feel shaking, take cover under a sturdy table or desk immediately.
- Avoid Elevators: Never use elevators during or after a tremor, as power failures are common.
- Stay Informed: Monitor official government emergency broadcasts for evacuation routes and shelter locations.
Frequently Asked Questions
What is a doublet earthquake?
A doublet is a pair of similar-sized quakes that hit close in location and time, according to the USGS.
Are more earthquakes expected in Venezuela?
While specific quakes cannot be predicted, the USGS reports a 99% chance of a magnitude 4 aftershock occurring in the region within the next week.
Is the Bocono fault dangerous?
The Bocono fault is a major geological structure that has produced significant seismic events historically, including the 1812 earthquake that resulted in an estimated 30,000 deaths.
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