Photo: USGS

HONG KONG, July 22 (Xinhua) -- An earthquake with a magnitude of 5.5 jolted 20 km NW of Port-Olry, Vanuatu at 02:24:58 GMT on Thursday, the U.S. Geological Survey (USGS) said.

The epicenter, with a depth of 35.0 km, was initially determined to be at 14.9034 degrees south latitude and 166.9396 degrees east longitude.