Aftershocks Rock Panama Following Largest Quake in Decades

A major earthquake struck Panama on Friday, causing evacuations, aftershocks, transport disruptions and temporary tsunami warnings. The US Geological Survey measured the main quake at magnitude 7.7 after initially registering 8.0. Panama’s geological institute reported 7.2. The event was Panama’s strongest in that region since at least 1951.

The earthquake was centered in Herrera Province, more than 120 miles, or 193 kilometers, southwest of the Panama Canal. It occurred at a depth of 12.6 kilometers. Its shallow depth helped produce strong shaking at the surface, according to a US earthquake expert.

The quake was felt across Panama and as far away as Medellín and other Colombian cities. Authorities evacuated Tocumen International Airport and shut Panama City Metro lines temporarily. The Panama Canal continued operating while technical teams inspected its facilities. Early USGS estimates suggested regional economic losses could exceed $1 billion.

An aftershock is an earthquake that follows a larger mainshock in the same affected region. It happens as rocks and faults adjust to changed stresses created by the first rupture. Aftershocks can continue for hours, days or longer, although the article focuses on those recorded immediately after Panama’s earthquake.

Panama’s main quake ruptured a major plate boundary. The rupture suddenly shifted the surrounding crust. That change did not end all movement. A magnitude-6.6 aftershock struck west of the original quake late Friday afternoon. Eight additional aftershocks reached magnitude 4.8 or higher.

These later shocks caused continued fear and sent people back into streets after evacuations. The article describes people standing barefoot or shirtless as shaking continued. Officials kept responding and inspecting infrastructure. The continuing tremors also made airport and public-transport safety checks necessary, even though no immediate deaths or injuries were reported.

Earthquake magnitude describes the size of an earthquake’s energy release. Panama’s event was unusually large for the country’s recent experience. The National Earthquake Information Center called it the strongest earthquake to hit that part of Panama since at least 1951.

The USGS first registered the quake at magnitude 8.0, then revised it to 7.7. Panama’s geological institute reported a magnitude of 7.2. These different figures came from separate assessments, but all identified a powerful earthquake. The quake struck at a shallow depth of 12.6 kilometers.

The main shock was followed by substantial seismic activity. A magnitude-6.6 aftershock hit west of the epicenter late Friday afternoon. Another eight aftershocks measured magnitude 4.8 or higher. Their strength helps explain why people continued evacuating buildings and waiting outdoors while officials checked airports, transportation systems and other facilities.

The earthquake disrupted movement and triggered safety checks across Panama. Tocumen International Airport temporarily suspended air operations and evacuated passengers and administrative areas. Officials assessed the terminal and control tower, while some flights were diverted to Colombia and Costa Rica.

Panama City’s Metro temporarily shut down lines 1 and 2. People also fled buildings, businesses, schools and homes across several regions. The evacuations reflected concern about strong shaking and continuing aftershocks. Firefighters reported no deaths or injuries in the immediate aftermath, while officials assessed possible structural damage.

The Panama Canal reported that operations continued normally. It activated emergency protocols and sent technical teams to inspect facilities for damage. Other major systems also continued operating, including electricity plants and the Trans-Panama oil pipeline. The response showed that transport and industrial services were being checked even as some public systems paused.

Tsunami warnings are issued when an undersea or coastal earthquake might displace the seafloor and push seawater toward shore. After Panama’s earthquake, the Pacific Tsunami Warning Center said waves one to three meters above tide level were possible along parts of Panama’s coast.

The warning reflected the earthquake’s location and potential to affect coastal water, not a confirmed large tsunami. The quake struck Herrera Province, and authorities had to consider hazards beyond shaking. The article does not report that damaging tsunami waves arrived. Instead, it records a precautionary alert while officials evaluated the threat.

By 2:42 p.m. local time, all tsunami warnings had been lifted. That decision meant the center no longer considered the stated wave threat sufficient to maintain alerts. Other emergency actions continued, including airport evacuation, infrastructure inspections and government mobilization. The Panama Canal also continued normal operations under activated emergency protocols.

The Ring of Fire is the seismically active zone that encircles the Pacific Ocean. It contains major boundaries where tectonic plates meet and move. Those boundaries can generate earthquakes when accumulated stress is suddenly released. The article identifies Panama’s earthquake as a rupture along one such boundary.

Scientists described the event’s mechanism as resembling a strike-slip earthquake. In a strike-slip rupture, blocks of Earth’s crust grind horizontally past each other rather than mainly moving up or down. That sideways movement can break a long section of a fault and release powerful seismic energy.

The article says the earthquake was shallow and “messy,” with energy close to the surface. That combination made the shaking especially concerning. The event was felt across Panama and in Colombian cities including Medellín. Its plate-boundary setting also helps explain why strong aftershocks followed as nearby crust adjusted.

Earthquake waves usually lose energy as they travel through rock and spread outward. A deeper earthquake has more distance and material through which its energy can weaken before reaching the surface. A shallow earthquake starts closer to people, buildings and infrastructure, so stronger shaking can arrive at the ground.

Panama’s main earthquake occurred at a depth of 12.6 kilometers. Geophysicist Jonathan Tytell described it as shallow and said the energy was “right there at the surface.” He explained that it did not have much time or distance to dissipate. This is why shallow depth can increase surface shaking, even though depth is only one factor affecting damage.

The strong shaking led people to flee buildings and prompted evacuations at Tocumen International Airport. Panama City Metro lines were temporarily closed, while canal facilities underwent inspections. Aftershocks prolonged the risk and fear. Early USGS estimates said economic losses in the region could exceed $1 billion.