PANAMA CITY - A moderate earthquake of 5.2 magnitude struck on the Pacific coast side of the Panama-Costa Rican border on Monday, the U.S. Geological Survey said, but only minor structural damage was reported.

The quake, which hit at 10:01 a.m. local time (4:01 p.m. British time), was centred 135 miles (217 km) southeast of San Jose, Costa Rica, and at a depth of about 22 miles (35 km), the USGS said.

The only initial report of damage was of cracks in the walls of a school in the Baru region of Panama, near the country's only active volcano, a spokeswoman for Panama's civil protection service said.