Earthquake detection equipment counted 25 events Saturday, but most were so small that they could not be detected by humans.
The 1:23 a.m. quake was the largest, and the remainder are considered aftershocks. The early morning quake was estimated between 4.3 and 4.2 magnitude.
The Observatorio Vulcanológico y Sismológico said the smallest quake its equipment noted was 0.6 magnitude.
All were in the vicinity of Hatillo, northern Desamparados and Guácima. No damage was reported.