Center Deputy Director Lu Pei-ling indicated that the earthquake was found to have been caused by a stress adjustment subsequent to the massive 7.3-magnitude earthquake that shook the central county of Nantou Sept. 21, 1999, killing some 2,400 people.
The Tuesday earthquake occurred at 2: 28 a.m., 15.2 km southeast of the Seismological Center's Taichung City monitoring station. The epicenter was 22.9 km underground, the report said.
The quake had an intensity of 5.1 in Changhua, and was followed by an aftershock with a magnitude of 3.7, which shook Nantou at 4:38 a.m.
