At about 2:35 AM on Nov. 7, an earthquake with a magnitude of 3.1 occurs in the northwest area of Chungju, Chungcheongbuk-do. /Courtesy of Korea Meteorological Administration

The Korea Meteorological Administration reported that a magnitude 3.1 earthquake occurred on the 7th at 2:35 a.m. in a region 22 kilometers northwest of Chungju, North Chungcheong Province. The epicenter is located at 37.14 degrees north latitude and 127.76 degrees east longitude.

The Korea Meteorological Administration initially announced the earthquake magnitude as 4.2 by automatically analyzing the seismic waves (P-waves) but later adjusted the magnitude to 3.1 through manual analysis.

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