HONG KONG -- An earthquake measuring 5.4 on the Richter scale jolted Luzon, the Philippines at 02:24:16 GMT on Thursday (10:24:16 Hong Kong Time), the U.S. Geological Survey said.

The epicenter, with a depth of 12.80 km, was initially determined to be at 17.7577 degrees north latitude and 120.9025 degrees east longitude.