On the 16th, about 10 minutes after the earthquake off Fukushima Prefecture, which observed shaking with a seismic intensity of 6 or higher in Fukushima and Miyagi prefectures, an Earthquake Early Warning was announced, but the Japan Meteorological Agency actually said that it was an earthquake with a seismic intensity of 3. , The two earthquakes that occurred at the same time could not be separated, and it was overestimated.
On the night of the 16th, the Earthquake Early Warning was announced three times at around 11:34, 11:36, and 11:46.
In the first Earthquake Early Warning, shaking with a seismic intensity of less than 5 was observed in Soma City, Fukushima Prefecture and Ishinomaki City, Miyagi Prefecture. I observed a strong tremor.
On the other hand, 10 minutes later, at around 11:46 pm, the Earthquake Early Warning was announced in Miyagi, Fukushima, and Yamagata prefectures, but the seismic intensity information was not announced immediately after that.
Subsequent analysis by the Japan Meteorological Agency confirmed that the earthquake was off the coast of Fukushima Prefecture, where a tremor with a seismic intensity of 3 was observed in Iitate Village, Fukushima Prefecture.
According to the Japan Meteorological Agency, it was overestimated because there was a small earthquake off the coast of Miyagi Prefecture at about the same time. It may happen. "