A 5.1-magnitude earthquake jolted the waters off southern Taiwan's Pingdong County at 9:47 p.m. Monday Beijing Time, according to the China Earthquake Networks Center (CENC).The epicenter was monitored at 21.62 degrees north latitude and 120.97 degrees east longitude, at a depth of 18 km, the CENC said.A 5.1-magnitude earthquake jolted the waters off southern Taiwan's Pingdong County at 9:47 p.m. Monday Beijing Time, according to the China Earthquake Networks Center (CENC).The epicenter was monitored at 21.62 degrees north latitude and 120.97 degrees east longitude, at a depth of 18 km, the CENC said.