Updated: 2024-05-18 10:07:03 (UTC+9)
Ver.8
Final Report
2024-05-18 09:55 (UTC+9),
OFF IBARAKI,
10km Depth, M 4.8 by JMA
OFF IBARAKI,
10km Depth, M 4.8 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 2024/05/18 10:06:12.
Estimated Is for Major Cities
| Max. Obs. Is | Histogram of Estimated Is |
Municipality
Show All Data | Daytime Population | Distance [km] |
| 3 | Katori,Chiba | 69,000 | 45 | |
| 3 | Sosa,Chiba | 35,000 | 44 | |
| 3 | Itako,Ibaraki | 24,000 | 40 | |
| 3 | Sakura,Chiba | 140,000 | 72 | |
| 3 | Narita,Chiba | 150,000 | 62 | |
| 3 | Kashima,Ibaraki | 66,000 | 32 | |
| 3 | Namegata,Ibaraki | 33,000 | 47 |
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
|
|
6- or greater
Not Available
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6+ or greater
Not Available
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Population exposed to Is 5- or greater are not estimated.
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.
Is Distribution of 2% Probability of Exceedance in 50 Years
Is Distribution of Return Period of 50,000-year
Major Historical Damaging Earthquakes in This Region
| Year | Region | M | Damage |
| 1756 | Choshi | 5.5-6.0 | Depots were damaged. Sake and Shoyu tanks were quaked. Stone pagodas fell over. |
| 1801 | Kazusa | -- | Kururi castle walls were damaged. Many houses collapsed. |
| 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. |
| 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