Costa Rica sits directly above the Middle America Trench, where the Cocos plate subducts beneath the Caribbean plate at one of the fastest rates in the region — roughly 8 to 9 centimetres a year in places. That rapid convergence makes Costa Rica one of the most seismically active countries in Central America, with earthquakes recorded somewhere in the country almost every day.
Earthquakes in Costa Rica: Live Map & the Nicoya Seismic Gap
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Costa Rica is also a rare scientific success story in earthquake forecasting. For decades, seismologists at the Volcanological and Seismological Observatory of Costa Rica (OVSICORI-UNA) had identified the Nicoya Peninsula as a mature 'seismic gap' — a locked patch of the subduction interface overdue to rupture. On 5 September 2012, it did: a magnitude 7.6 earthquake struck almost exactly where forecast, and thanks to dense instrumentation, strict building codes and a mostly rural epicentre, it caused remarkably few deaths for its size.
San José, the capital, sits inland in the Central Valley and generally experiences more moderate shaking than the Pacific coast. Costa Rica's National Seismological Network (Red Sismológica Nacional) and OVSICORI maintain one of the densest monitoring networks in Latin America, and the country has invested heavily in seismic-resistant construction, which is a major reason its earthquake death toll stays low despite very high seismic activity.
Frequently asked questions
Why does Costa Rica have so many earthquakes?
Costa Rica sits directly above the Middle America Trench, where the Cocos plate subducts beneath the Caribbean plate at roughly 8-9 cm a year, one of the fastest convergence rates in the region.
What is the Nicoya seismic gap?
A mature, locked section of the subduction interface beneath the Nicoya Peninsula that had ruptured with large quakes in 1853, 1900 and 1950, making it overdue and closely monitored by scientists.
Did scientists predict the 2012 Costa Rica earthquake?
Yes, remarkably closely. OVSICORI-UNA had flagged the Nicoya gap as overdue for years, and on 5 September 2012 a magnitude 7.6 quake ruptured almost exactly where forecast.
How many people died in the 2012 Nicoya earthquake?
Remarkably few for a magnitude 7.6 event, thanks to dense seismic instrumentation, strict building codes and a mostly rural epicentre away from major population centres.
How often do large earthquakes hit the Nicoya Peninsula?
Roughly every 40 to 45 years on average for magnitude 7+ events, based on the historical rupture record since the 1850s, though the wider area records dozens of smaller quakes yearly.
Is San José, Costa Rica at risk of earthquakes?
Yes, but generally less than the Pacific coast. San José sits inland in the Central Valley and typically experiences more moderate shaking than areas closer to the subduction trench.
Does Costa Rica have a good earthquake warning system?
Yes. The Red Sismológica Nacional and OVSICORI-UNA operate one of the densest seismic monitoring networks in Latin America, feeding into strict national building codes.
Where can I see live earthquakes in Costa Rica?
The live map on this page pulls real-time USGS data for Costa Rica and the surrounding Cocos-Caribbean subduction zone, updated continuously.
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