Updated: 2026-10-01 21:32:55 (UTC+9) Ver.7
2026-10-01 21:27 (UTC+9),
NE CHIBA,
50km Depth,
M 5.1
by JMA
Is Distribution
Maximum Observed Is:3
Seismic Intensity (Is) distribution is estimated from the observed data (circles) of NIED K-NET, KiK-net, JMA, and local governments that had been collected by 2026/10/01 21:32:40.
Estimated Is for Major Cities
| Max. Obs. Is | Histogram of Estimated Is |
Municipality Show All Data | Nighttime Population | Distance [km] |
| 3 | Sosa,Chiba | 37,000 | 15 | |
| 3 | Yokoshibahikari,Sambu,Chiba | 24,000 | 23 | |
| 3 | Katori,Chiba | 77,000 | 21 | |
| 3 | Asahi,Chiba | 66,000 | 9 | |
| 3 | Sakura,Chiba | 170,000 | 44 | |
| 3 | Sammu,Chiba | 53,000 | 33 | |
| 3 | Itako,Ibaraki | 29,000 | 21 | |
| 3 | Togane,Chiba | 61,000 | 40 | |
| 3 | Narita,Chiba | 130,000 | 34 | |
| 3 | Kamisu,Ibaraki | 95,000 | 10 | |
| 3 | Yachimata,Chiba | 69,000 | 37 | |
| 3 | Inashiki,Ibaraki | 43,000 | 38 |
The histogram shows frequency distribution of estimated Is derived from interpolation of the observation with 250-m mesh. The daytime and nighttime correspond to 9:00-18:59 and 19:00-8:59, respectively. The distance is measured from the epicenter to the center of the municipality.
Is Exposed-Population Estimates of Each City
5- or greater
Not Available
|
5+ or greater
Not Available
|
6- or greater
Not Available
|
6+ or greater
Not Available
|
Population exposed to Is 5- or greater are not estimated.
Major Historical Damaging Earthquakes in This Region
| Year | Region | M | Damage |
| 1894 | Eastern Tokyo | 7.0 | Tokyo Earthquake,Many houses collapsed in Kanda, Honjo, and Fukagawa. 24 dead in Tokyo, 7 dead in Kawasaki and Yokohama in Kanagawa. |
| 1895 | Southern Ibaraki | 7.2 | 53 collapses (43 houses and 10 depots), 6 dead. |
| 1915 | Boso Peninsula | 6.0 | Some landslides. 5 injured, some houses collapsed. |
| 1921 | Southern Ibaraki | 7.0 | Ryugasaki Earthquake,Minor damage in Chiba and Ibaraki such as damage to houses and roads. |
| 1922 | West coast, Chiba | 6.8 | Uragasuido Earthquake,1 dead in Tokyo, 1 dead in Yokohama, Kanagawa. Houses were damaged. |
| 1938 | Off Ibaraki | 7.0 | 250 houses damaged in Fukushima. 1 depot collapsed in Ibaraki. A small tsunami was observed. |
| 1987 | E Off Chiba | 6.7 | 2 dead, 161 injured in Chiba. 16 houses collapsed and over 70,000 partially destroyed. Many roads damaged. |
| 2011 | Hamadori, Fukushima | 7.0 | The crustal earthquake with normal faults, induced by the 2011 off the Pacific Coast of Tohoku Earthquake. 4 dead, 10 injured (as of March 2016). Maximum Is was 6-. |
| 2012 | E Off Chiba | 6.1 | The crustal earthquake with normal faults, induced by the 2011 off the Pacific Coast of Tohoku Earthquake. 1 dead, 1 injured. Maximum Is was 5+. |
Reference: National Astronomical Observatory of Japan, Chronological Scientific Tables, Maruzen, (2017) *partially extracted
Seismic Hazard Information of J-SHIS
J-SHIS is a Web service by NIED, to help prevent and prepare for earthquake disaster by providing a public portal for seismic hazard information across Japan.
