Jan 18, 2026 20:00:00

'Strong Earthquake Monitor' displays earthquake tremors across Japan in real time

The Strong Earthquake Monitor , released by the National Research

Institute for Earth Science and Disaster Resilience, a national research and development agency under the jurisdiction of the Ministry of Education, Culture, Sports, Science and Technology, allows users to view detailed earthquake tremors occurring across Japan in real time at one-second intervals.

Strong earthquake monitor
http://www.kmoni.bosai.go.jp/

The strong earthquake monitor looks like this: Real-time seismic intensity is displayed as colored dots on a map of Japan.

By selecting 'Noto Peninsula' from the tab at the top, you can switch to a map with a close-up of the Noto Peninsula.

The 10 indicators that can be displayed on the map are 'real-time seismic intensity,' 'maximum acceleration,' 'maximum velocity,' 'maximum displacement,' '0.125Hz velocity response,' '0.25Hz velocity response,' '0.5Hz velocity response,' '1.0Hz velocity response,' '2.0Hz velocity response,' and '4.0Hz velocity response.'

You can also switch between viewing surface data and underground data.

When I clicked 'Switch Background', the background of the map of Japan changed from white to gray.

On the Strong Motion Monitor, by moving the slide below the map, you can view real-time data in one-second increments going back up to one hour from the time you are viewing the page.

While reviewing the data going back in time, I found information about

an earthquake that occurred in the northern Soya region of Hokkaido at 10:57 AM on January 16, 2026. When an earthquake occurs, information is displayed in the area below the map, and in this case, the earthquake was magnitude 4.0, the epicenter was 10 km deep, and the maximum predicted seismic intensity was 3. Also displayed on the map is a 'prediction circle' showing how far the earthquake will spread.