A 7.9-magnitude earthquake struck off the Pacific coast of Costa Rica Wednesday, the US Geological Survey reported. A tsunami warning was issued for parts of the Pacidic sides of Central and South America after the major quake, it added. The agency said the center of the quake, which hit at 1442 GMT, was 80 kilometers (50 miles) from Liberia, Costa Rica and 151km (94 miles) west of San Jose, Costa Rica