A series of earthquakes in the 4.4 to 4.5 range is normal and part of the readjustment of the earth to the Sept. 5 magnitude 7.6 Sámara quake, said the Laboratorio de Ingeniería Sísmica Sunday. Similar flurries of quakes are to be expected, it said.
The Laboratorio, an agency of the Universidad de Costa Rica, registered quakes Sunday at 2:38 p.m., 3:05 p.m. and 4:01 p.m.. There also were lesser quakes at 1:10 p.m. and 2:16 p.m., said the Laboratorio. The Observatorio Vulcanológico y Sismológico de Costa Rica also registered the quakes although at a slightly greater magnitude. They were along the west coast of the Nicoya peninsula.
The Laboratorio noted that there was a 5.1 magnitude quake off the Pacific coast of El Salvador, too, and attributed it to the Aug. 27 quake in that area of 7.3 magnitude.