Regarding the earthquake that observed shaking with a seismic intensity of less than 5 in Ibaraki Prefecture, Professor Takashi Furumura of the Earthquake Research Institute, the University of Tokyo said, "From the depth of the epicenter, it is thought that it occurred inside the Pacific plate subducting into the land plate. Because the epicenter was just below the land, it seems that the shaking was like pushing up near the epicenter. "

On top of that, "Generally, compared to earthquakes with shallow epicenters and earthquakes that occur at the plate boundary, the subsequent seismic activity tends to be less, but seismic activity has recently continued to be active in the surrounding areas such as off Fukushima Prefecture. Therefore, please be careful of earthquakes with the same degree of shaking for a while. "