A powerful earthquake struck southern Panama on 9 October, with the reviewed event record placing its magnitude at 7.7 and its origin 12.6 kilometres below the surface. The epicentre was about 12 kilometres west-south-west of Pitaloza Arriba. The event occurred at 17:56:06 UTC, or 12:56 local time.
Early impact estimates indicate that around 4.6 million people experienced shaking ranging from moderate to severe. That is an estimate of shaking exposure, not a count of people injured, displaced or otherwise directly affected. Authorities and responders may revise assessments as information from communities and infrastructure inspections becomes available.
Tsunami alerts and coastal precautions
A tsunami alert accompanied the earthquake. The warning information at the time described a potential threat to parts of the Pacific coast of Central America and several neighbouring countries, including Mexico. The alert warned that strong currents and sudden surges could occur, and advised people near the shore to move to higher ground and follow instructions from local authorities.
A regional disaster-monitoring record associated a tsunami height of 1.1 metres with the event. That figure should be understood as a recorded event measurement, not a claim that a wave of that height struck every coastline covered by an alert. Tsunami conditions vary by location, and warnings are precautionary: they are issued to give coastal communities time to respond to a possible hazard.
People in coastal areas should rely on current official instructions rather than assume that an alert has ended because shaking has stopped or the first wave has passed. Tsunamis can involve multiple surges and strong currents, and dangerous conditions may persist after an initial arrival. Anyone instructed to evacuate should remain away from the coast until authorities say it is safe to return.
What the shaking estimate means
The shaking estimate describes an area-wide model of how strongly the ground was likely to move. It does not mean that every person in the estimated population felt the same intensity, or that buildings experienced uniform damage. Local effects can differ with distance from the epicentre, ground conditions, building design and the construction materials used.
Intensity describes the observed or estimated effects of shaking at particular places; it is distinct from magnitude, which measures the size of the earthquake at its source. A single earthquake has one magnitude estimate, while shaking intensity can vary across a wide region. That distinction helps explain why a large population may fall within a broad exposure estimate without implying a single outcome for homes, public buildings or people.
Panama lies in a seismically active region where interactions between tectonic plates generate earthquakes. Strong shaking can also be followed by aftershocks, some of which may be damaging, so damaged structures and unstable slopes require caution. An earthquake’s occurrence alone does not establish the condition of any particular building; inspections by qualified local authorities are needed before damaged premises are considered safe.
Information remains provisional
Initial disaster assessments are designed to guide awareness and preparedness while response information is still developing. The reviewed origin and magnitude provide a firm description of the earthquake, but population exposure and tsunami measurements answer different questions and should not be treated as casualty or damage totals. The exposure estimates do not establish deaths, injuries or the scale of structural damage.
Residents should follow local emergency-management and coastal authorities for evacuation zones, shelter locations and all-clear notices. Travellers should check with transport operators before setting out, particularly where coastal roads, ports or airports may be affected by inspections or precautionary closures. In the hours after a major earthquake, conditions and official guidance can change as new observations are assessed.
