An earthquake measuring 5.1 on the Richter Scale shook the sea east of Hualien County, Taiwan at 5:34p.m. Beijing time Sunday, Xinhua quoted China's seismological network as saying. The epicenter was located at 24.2 degrees north latitude and 121.8 degrees east longitude, about 30 kilometers from Hualien County and 100 km from Taipei. Hualien County is on the eastern coast of Taiwan island.