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6.3
EarthquakeMajor

M6.3 earthquake near Nicoya, Guanacaste Province

12998 d ago · 16 Mar 1991, 06:02 UTC 15 km N of Nandayure, Costa Rica

What happened

A magnitude 6.3 earthquake struck 15 km N of Nandayure, Costa Rica on 16 Mar 1991, 06:02 UTC at a depth of 33 km.

Earthquakes of this size are classed as Strong. Can cause damage in populated areas up to tens of kilometres away. This was a shallow earthquake, which tends to be felt more strongly at the surface.

The nearest town in our records is Nicoya, about 29 km away in Guanacaste Province, Costa Rica.

Timeline

  1. First reported by USGS

    16 Oct 2026, 20:46 UTC

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