Panama rattled by fresh 5.5 magnitude earthquake

Panama experienced a powerful earthquake sequence, beginning with a major 7.7-magnitude quake and followed by many aftershocks. The main earthquake struck at a depth of 10 km, making it a shallow event. It was centered about 10 km southwest of Pitaloza Arriba, a remote community in Herrera province. The event mattered because it caused evacuations, injuries, building damage and regional tsunami warnings.

Damage was concentrated in the central provinces of Veraguas, Herrera and Los Santos. Officials reported damage to Penonomé’s cathedral, the governor’s office and the Dos Continentes hotel. Local media reported that the historic Church of San Atanasio in Los Santos collapsed. One person was injured by debris from a partly collapsed structure in Penonomé.

Panama City had no reported damage at the time. Tocumen International Airport briefly suspended operations, then reopened. The Panama Canal continued operating while technical teams inspected its facilities. President José Raúl Mulino said no deaths had been documented by Friday evening, though assessments were continuing.

An aftershock is an earthquake that follows a larger earthquake in the same general region. It happens because the main quake changes stresses along nearby sections of a fault. Those sections may then shift as the crust adjusts toward a new balance. Aftershocks can continue for hours, days or longer, and some can still damage weakened buildings.

Panama’s main earthquake was initially reported as magnitude 8 before being revised to 7.6 and then 7.7. The powerful movement was followed by many smaller tremors. Reported aftershocks included magnitudes 5.8, 5.5 and 5.2. The University of Panama recorded more than 45 aftershocks, although many were too weak to feel.

The sequence remained active while authorities assessed damage. People reported strong shaking, falling objects and fear, especially in Herrera province. Officials continued inspections of buildings and infrastructure. The continuing aftershocks made caution important because damaged structures could become less stable, even after the largest shock had passed.

The main earthquake was ultimately measured at magnitude 7.7, after the USGS revised its estimate from 8 to 7.6 and then 7.7. Later tremors included magnitudes 5.5 and 5.8. These numbers may look close, but earthquake magnitude is logarithmic. A one-unit increase represents about ten times greater wave amplitude and roughly 32 times more energy released.

Using that scale, a 7.7 earthquake produces about 158 times the wave amplitude of a 5.5 quake and about 79 times that of a 5.8 quake. Its energy release is roughly 1,600 times greater than the 5.5 event and about 700 times greater than the 5.8 event. These are approximate comparisons based on the standard magnitude relationship.

The later earthquakes were still strong enough to be felt and potentially damage weakened structures. However, the main quake’s much greater size explains why it caused the most serious shaking, evacuations and infrastructure concerns. More than 45 aftershocks followed, many too weak to feel.

Earthquakes near coasts can prompt tsunami warnings because sudden movement beneath or near the seafloor may displace water. That displacement can send waves across the ocean and toward coastlines. Authorities issue warnings or advisories quickly because the first information about an earthquake can be incomplete, and early action can protect people in vulnerable coastal areas.

After Panama’s major earthquake and subsequent tremors, tsunami warnings covered parts of Central and South America. The National Weather Service later lifted warnings for Panama, Colombia, Ecuador, Nicaragua and Guatemala. The article does not state that a tsunami struck these coastlines. It reports the warnings and their later cancellation.

Warnings can be lifted when ongoing monitoring indicates that the expected tsunami danger has passed or is not developing. This process depends on earthquake data, water-level observations and official assessments. The episode shows why warnings may be precautionary at first, then revised as agencies receive clearer information about the actual threat.

The USGS and EMSC helped measure and report the earthquakes. The USGS recorded the main event and revised its estimate from magnitude 8 to 7.6 and then 7.7. It also recorded a later magnitude 6.0 earthquake near La Tronosa. The EMSC reported the latest magnitude 5.5 tremor. These updates helped establish the sequence’s size and timing.

The University of Panama focused on aftershocks. Its seismologists recorded more than 45 tremors, although many were too weak to feel. Panama’s National Civil Protection Service assessed physical impacts and reported that damage was concentrated in Veraguas, Herrera and Los Santos. Omar Smith, from the service, described damage and injuries to local media.

Together, these organizations supported monitoring, public communication and response decisions. Other authorities inspected critical infrastructure. Tocumen Airport temporarily suspended operations, while the Panama Canal Authority checked facilities and continued normal operations. The National Weather Service later lifted tsunami warnings across several regional coastlines.

A shallow earthquake can cause intense shaking near the surface because its energy travels a shorter distance before reaching buildings and people. The main quake’s depth was 10 km. Its center was near Pitaloza Arriba in Herrera province, so communities in Herrera, Veraguas and Los Santos were closer to the strongest shaking than Panama City.

The article reports concentrated damage in those central provinces, including a collapsed historic church in Los Santos and damaged buildings in Penonomé. It also says no damage had been reported in Panama City at the time. In general, damage can vary with distance from the source, local ground conditions, construction quality and whether structures were already weakened. The article does not identify which factor mattered most in each location.

The contrast does not mean Panama City felt nothing. It means officials had not reported damage there when the account was published. Assessments were still continuing, and aftershocks remained possible. Authorities therefore kept inspecting buildings and infrastructure while urging people to remain calm.

Earthquakes are caused by the movement of large pieces of Earth’s crust and by stress building along faults. Rock can remain locked while pressure increases. When the stress becomes greater than the fault’s resistance, the rocks suddenly slip. The stored energy travels outward as seismic waves, producing the shaking people feel and buildings experience.

The main earthquake releases stress on one part of a fault but can change stress nearby. Other sections may then slip in smaller movements. These later events are aftershocks. Their size and number depend on the rupture and the surrounding fault system. Panama’s University of Panama recorded more than 45 aftershocks after the main 7.7 earthquake, including tremors of 5.8, 5.5 and 5.2.

The article describes the earthquake sequence and its effects, but it does not identify the specific fault or tectonic process responsible. The continuing aftershocks explain why officials kept monitoring the country, inspecting structures and warning people to remain cautious while assessments continued.