A recent string of powerful earthquakes has shaken South America, raising concerns among scientists. In late June 2026, a major tremor struck Venezuela. A month and a half later, a large earthquake rattled Colombia. Following these events, a 6.7 magnitude quake hit Peru, just as predicted. At the center of this chain reaction? The Nazca Plate.
This huge chunk of the Earth's crust sits beneath the Pacific Ocean and constantly pushes against the South American continent. But the full picture has more layers than a single cause. The western coast of South America has a long history of intense earthquakes. During the 20th century, this region witnessed several devastating quakes, driven by geological forces that are still active today
The 1960 Valdivia earthquake
The most powerful earthquake ever recorded happened in Chile in 1960. It measured 9.5 on the Richter scale, and its destructive power permanently changed the local landscape. Death tolls vary, but 1,655 lives lost is the most commonly accepted official estimate.
The 1970 Peru disaster
A decade later, a 7.9-magnitude quake struck Peru's Ancash region. The shaking triggered a massive landslide that buried several towns and killed tens of thousands.
In February 2010, a magnitude 8.8 earthquake struck the Maule region of Chile, just north of the area shaken by the 1960 quake. It ranks among the strongest earthquakes ever recorded anywhere on the planet. Over 500 lost their lives.
All these historical disasters share a common trigger point. They originate from a massive piece of the Earth's crust called the Nazca Plate that stretches across a huge portion of the eastern Pacific Ocean.
It runs along the coasts of Colombia, Ecuador, Peru, and Chile, pressing eastward against the much larger South American Plate that consists of the entire continent and huge parts of the Atlantic Ocean seabed. That collision, slow but constant, is the root cause behind a large share of the earthquakes recorded along this coastline.
On June 24, 2026, two earthquakes struck northern Venezuela less than a minute apart. A magnitude 7.2 foreshock was followed by a magnitude 7.5 mainshock centered near La Guaira, west of Caracas.
The pair of heavy earthquakes killed more than 6,000 people and injured over 16,000 more. Entire neighborhoods in La Guaira state collapsed. The earthquake was the strongest to hit the country in more than a century.
But Venezuela's earthquakes did not come from the Nazca Plate. They resulted from the Caribbean Plate grinding against the South American Plate in the country's north.
Building underground pressure
When a plate moves against another and causes a quake, it often transfers stress and energy to other connected plates. The Nazca Plate, the Caribbean Plate, and the South American Plate continue to push against one another, and the effects of this can sometimes be felt throughout the continent.
The energy from the Venezuelan tremor traveled through the surrounding rock, pushing against neighboring plates. This put extra pressure on fault lines running south along the Andes Mountains.
As a result, 47 days after the Venezuelan quake, the ground shook violently in Colombia. A magnitude 7.4 to 7.5 earthquake struck Colombia, near the town of San José del Palmar.
It killed more than 300 people, injured more than 4,500, and left over 425 people missing, according to figures released by Colombia's government. The quake was felt as far away as Ecuador, Panama, and Venezuela, and it damaged hospitals, an airport, and thousands of homes.
Seismologists quickly noticed a pattern forming along the edge of the continent. They mapped the locations of the Venezuelan and Colombian tremors and saw a clear line moving southward.
The day after the Colombian tremor, a prominent seismologist recognized a pattern in these events. He stated that the shifting geological pressure made Peru the most likely target for the next big tremor.
The prediction comes true. On August 20, 2026, the scientist's warning became a reality when a 6.7-magnitude earthquake hit Peru. The tremor shook coastal cities and sent residents running into the streets for safety.
The earthquake originated roughly 62 miles (100 km) underground, deep inside the Nazca Plate itself, rather than in a shallow fault closer to the surface. Deeper earthquakes generally lose more energy on their way up, which helps explain why this one caused far less destruction than the ones in Venezuela and Colombia.
The risk to other countries
The release of energy in Peru does not guarantee safety for countries further north. Specialists believe that northern Chile, Bolivia, Ecuador, and southern Colombia, areas along the Nazca Plate, could experience more significant aftershocks or entirely new earthquakes soon.
A continent on the edge
This rapid succession of earthquakes has left millions of South Americans on high alert. Governments are updating emergency response plans and urging citizens to prepare survival kits.
Understanding subduction zones
The primary cause of this regional instability is a process called subduction. The Nazca Plate is heavier than the South American Plate, so it dives underneath the continent as they collide.
The two massive rock plates do not slide past each other smoothly. Rough edges catch and lock together, causing friction to build up over decades or even centuries.
The rocks bend and store incredible amounts of energy like a coiled spring. Eventually, the stress becomes too great for the rocks to hold.
The locked fault suddenly snaps, and the plates violently slide past one another. This sudden release of stored energy sends powerful shockwaves up to the surface.
This ongoing collision does more than just cause earthquakes. The incredible pressure from the Nazca Plate continues to push the South American Plate upward.
Scientists identify high-risk zones by looking for seismic gaps along a fault line. These are areas that have not experienced a major earthquake in a very long time, with pressure building in these zones for decades and even centuries.
Many large South American cities are built directly over these dangerous seismic gaps. Lima, Bogotá, and Caracas all face significant risks from future tectonic shifts.
Geologists can now track how much tension is building beneath the surface. A vast network of seismometers is spread across the continent to detect the smallest vibrations and pick up early warning signs of shifting rock.
Despite this advanced technology, predicting the exact day or time of an earthquake remains impossible. Scientists can only provide a general probability of when a rupture might happen.
The Nazca Plate continues pushing beneath South America at a steady pace. The sequence of earthquakes in 2026 is a reminder that this region remains under tremendous stress, with more earthquakes waiting to occur.