tokens: The quake struck at 11.16 a.m. -LPR- 1716 GMT -RPR- and was centred 10 miles -LPR- 16 km -RPR- south of the port of Quepos , which is 90 miles -LPR- 140 km -RPR- south of the capital San Jose , the Costa Rican Volcanic and Seismologicial Observatory said .