The Japan Meteorological Agency will add the "long-period ground motion" that slowly shakes high-rise buildings during an earthquake to the subject of the Earthquake Early Warning from noon on the 1st.
We will issue a preliminary report targeting areas where very strong shaking is expected, and call for vigilance to high-rise buildings.
Long-period ground motion is a long-period tremor that causes skyscrapers to shake strongly and slowly. In the 2011 Tohoku-oki earthquake, skyscrapers in Tokyo and Osaka, which are far from the epicenter, also shook greatly.
The Japan Meteorological Agency will newly add such long-period earthquake ground motion to the subject of the Earthquake Early Warning from noon on the 1st.
Of the four levels of long-period ground motion defined by the Japan Meteorological Agency, the target is "class 3," which makes it difficult to stand, and "class 4," which makes it impossible to move without crawling. This is an area where tremors are expected.
In addition to the conventional cases where shaking with a seismic intensity of 5 lower or more is predicted, an earthquake early warning will be issued in areas where such long-period ground motion is predicted, and high-rise buildings will be alerted.
On the other hand, long-period earthquake ground motion can cause large tremors even in areas far away from the epicenter. It means that there is also something.
According to the Japan Meteorological Agency, since 2000, there have been a total of 33 earthquakes with class 3 or higher long-period ground motion, including the Great East Japan Earthquake, the 2004 Niigata Prefecture Chuetsu Earthquake, and the 2016 Kumamoto Earthquake. increase.
The Japan Meteorological Agency said, ``The number of high-rise buildings is increasing, especially in large cities, and the number of people affected by long-period ground motion is increasing. I need to take it, and I want you to protect your own safety without panicking."