According to the official measurement of the China Seismological Network: At 11:43 local time (UTC+8) on the 28th, a magnitude 4.4 earthquake occurred in the Yellow Sea (38.27 degrees north latitude, 122.96 degrees east longitude), with a focal depth of 30 kilometers.

The epicenter of the earthquake was 113 kilometers away from Huancui District, Shandong Province, 116 kilometers away from Changhai County, Dalian, Liaoning Province, 135 kilometers away from Zhongshan District, Dalian City, and 399 kilometers away from Shenyang City.

According to historical records, earthquakes have occurred many times in the Bohai Sea and Yellow Sea region. The region has recorded 21 earthquakes above magnitude 3.0, including 14 earthquakes above magnitude 4.0, 10 earthquakes above magnitude 5.0, 6 earthquakes above magnitude 6.0, and magnitude 7.0. There were 4 earthquakes above, the largest one occurred on June 13, 1888, with an earthquake magnitude of 7.5.