Last Updated on 2 hours ago by TodayWhy Editorial
When the magnitude 7.2 and 7.5 earthquakes tore through northern Venezuela on June 24, 2026, the most haunting images weren’t cracked walls — they were entire apartment towers reduced to flat stacks of concrete slabs, floor pressed on floor with almost no open space between them. Engineers have a name for this: pancake collapse. So why did so many Venezuelan high-rises fail this way, and could it have been prevented?
What is a “pancake collapse”?
In a well-engineered concrete building, the columns are designed to bend and crack gradually under extreme stress, absorbing the earthquake’s energy before they fail — a property engineers call ductility. In a pancake collapse, the opposite happens. The columns supporting a floor shatter almost instantly, with no warning deformation. Once a column loses its load-bearing capacity, the floor above has nothing left to stand on and drops straight down onto the floor below it, which then drops onto the one below that, and so on, all the way to the ground. Structural engineers who reviewed footage from Venezuela noted that the buildings that failed this way appeared to be made from concrete that simply couldn’t deform before breaking, rather than bending and cracking slowly the way modern earthquake-resistant concrete is designed to.
This collapse pattern is particularly lethal for two reasons. First, it happens fast — often in seconds — leaving occupants almost no time to escape. Second, it crushes the gaps between floors down to almost nothing, which is why pancake-collapsed buildings are so difficult and dangerous for search-and-rescue teams to work through; there’s often no survivable void space left for anyone trapped inside.
The real culprit: “non-ductile” concrete
The technical term structural engineers use for the failure mode behind pancake collapses is non-ductile concrete construction. The problem isn’t the concrete itself, but how much steel reinforcement surrounds it — specifically, the steel “ties” or hoops wrapped around the vertical reinforcing bars inside a column.
Those ties matter enormously. In a column with closely spaced steel ties, the reinforcing bars are held tightly in place, so even after the surrounding concrete starts to crack, the column can keep bending and absorbing energy without fully losing its strength. In a column with few or widely spaced ties — typical of older construction standards — the concrete shatters outward once it’s overstressed, the core loses confinement, and the column simply gives way. Seismic retrofit engineers describe non-ductile reinforced concrete as one of the most consistent causes of earthquake fatalities worldwide, precisely because these buildings tend to be mid- and high-rise structures that house large numbers of people.
This isn’t unique to Venezuela. The same failure pattern has repeated in earthquake after earthquake for more than half a century. A structural engineering review of the 1971 Sylmar earthquake in California found that the collapse of several concrete buildings — including a veterans’ hospital that killed dozens of people — was caused by exactly this kind of non-ductile column detailing, even though those buildings had been designed to the codes considered standard at the time. Engineers who assessed the catastrophic 2023 Turkey-Syria earthquakes reached the same conclusion: almost everything that collapsed was non-ductile concrete construction, a building type so common in parts of Turkey that the region has suffered serious earthquake losses roughly every decade.
Why Venezuela was especially exposed
Venezuela didn’t lack seismic awareness — the country sits on the active Caribbean–South American plate boundary and has a long earthquake history, as TodayWhy’s full breakdown of why the June 2026 doublet was so powerful explains. What it lacked, for decades, was a modern building code that required ductile detailing in ordinary construction.
Venezuela’s first dedicated seismic-resistant building standard, COVENIN 1756, was only approved in 1982 — meaning every concrete structure built before that year was, by definition, designed without the column-confinement requirements that later became mandatory. The code was substantially revised again in 1998 and most recently updated in 2019, each time tightening the reinforcement detailing required in earthquake-prone zones. But updating a building code only changes how new buildings are built — it does nothing for the hundreds of thousands of older apartment blocks, hospitals, and commercial buildings already standing across Caracas, La Guaira, and the other cities hit hardest by the June 24 quakes. Retrofitting an existing column to add ductility is invasive, expensive, and in a country facing Venezuela’s economic pressures over the past decade, it has rarely been a budget priority.
Why this matters for what comes next
The pattern is now a familiar one to earthquake engineers: a population center sits for decades on top of aging non-ductile concrete stock, building codes eventually catch up to the science, and then a major earthquake exposes exactly which buildings were built before — and after — that turning point. Venezuelan officials have said it will take days to fully assess the scale of destruction, but engineers reviewing the early footage already see a consistent signature: structures built to the pre-1982 standard collapsing completely, while many newer buildings nearby, designed under the updated code, remained standing or suffered far less severe damage.
That pattern doesn’t make the disaster any less devastating, but it does point to where the recovery effort’s hardest long-term question lies: identifying which of the surviving older buildings share the same hidden weakness, before the next earthquake along this fault system arrives.
Frequently Asked Questions
What caused the Venezuela buildings to collapse like pancakes?
Many of the buildings that collapsed were made of non-ductile concrete — construction that lacks enough closely spaced steel reinforcement around its support columns to bend and absorb earthquake energy. When overstressed, these columns shatter rather than flex, causing each floor to drop straight onto the one below it.
Is pancake collapse the same everywhere?
The structural cause is the same wherever it occurs, but it has repeated in many major earthquakes, including the 1971 San Fernando/Sylmar earthquake in California, the 1994 Northridge earthquake, and the 2023 Turkey-Syria earthquakes, because non-ductile concrete construction was common worldwide before modern seismic codes became standard.
When did Venezuela introduce earthquake-resistant building codes?
Venezuela’s first dedicated seismic code, COVENIN 1756, was approved in 1982, with major revisions in 1998 and 2019. Buildings constructed before 1982 were not required to meet modern column-confinement standards.
Can non-ductile concrete buildings be fixed after they’re built?
Yes, through seismic retrofitting, which typically involves wrapping columns in steel or fiber-reinforced jackets to add the confinement they were originally missing. Retrofitting is effective but costly, which is why large numbers of older buildings worldwide — not only in Venezuela — remain unretrofitted.