Real-time coverage of earthquake event — 81 km SW of Puerto Madero, Mexico — Pandita Data.
🌍 OPEN LIVE 3D EARTHQUAKE MAPA magnitude 5.5 earthquake struck 81 kilometres southwest of Puerto Madero, Chiapas, Mexico, at 17:45 UTC on July 19, 2026, at a depth of 35 kilometres. The USGS recorded no tsunami warning, and the PAGER alert system assigned a GREEN designation, indicating minimal expected damage and casualties in this sparsely populated coastal region.
The event occurred within Mexico's active Pacific subduction zone, where the Cocos Plate descends beneath the North American Plate at a rate of approximately 7.5 centimetres per year. Puerto Madero, a small fishing community in southern Chiapas, sits directly above this collision zone. At magnitude 5.5 and 35 km depth, this earthquake represents a moderately energetic intermediate-depth event typical of subduction zone mechanics—powerful enough to be felt across several states, but insufficient to generate significant seafloor displacement or tsunami waves.
The Cocos Plate subducts beneath the North American Plate along the Middle America Trench, creating one of Mexico's most seismically active regions. This boundary has produced numerous magnitude 6+ earthquakes throughout recorded history. The July 19 event is consistent with typical intermediate-depth rupturing: stress accumulates as cold oceanic lithosphere descends into the mantle, releasing energy through brittle failure in the slab interior rather than at the plate interface itself.
At 35 km depth within the Cocos slab, this earthquake released approximately 5.6 × 1018 joules—equivalent to roughly 1.3 megatons of TNT. The shallow-to-intermediate depth amplifies felt reports across broader areas; however, the moderate magnitude limits strong shaking intensity to the immediate epicentral zone. Tsunami generation requires vertical seafloor displacement, which intermediate-depth slab earthquakes rarely produce, explaining the absence of any marine warning.
Intermediate-depth subduction earthquakes rupture within the descending slab, not at the plate interface. This interior rupturing causes minimal seafloor uplift. Tsunamis require significant vertical seafloor motion—typically from shallow (<50 km), interface-focused megathrust ruptures. The 35 km depth of this event places it well within the slab, resulting in predominantly horizontal stress release and negligible water displacement.
Puerto Madero and nearby communities across southern Chiapas likely experienced moderate shaking (Modified Mercalli Intensity IV–V), sufficient to rattle dishes and alarm residents but unlikely to cause structural damage in well-built structures. The sparsely populated nature of the epicentral zone—dominated by fisheries, mangrove wetlands, and small coastal settlements—minimizes casualty risk. No major urban centres lie within 100 km. The PAGER GREEN assessment confirms low expected damage, though isolated power outages or minor building damage in older structures cannot be excluded.
Monitor Pandita Data's real-time 3D earthquake simulation to visualize seismic wave propagation across Mexico and understand how depth and magnitude drive ground motion patterns. Explore historical subduction zone earthquakes in the region to build long-term preparedness awareness.
FAQ::[ {"q":"What caused this earthquake?","a":"The Cocos Plate subducting beneath Mexico ruptured 35 km deep within the descending slab. This intermediate