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J-SHIS EARTHQUAKE SOURCE MODEL

Nishiyama fault zone (Kama-toge segment)

西山断層帯嘉麻峠区間

What this earthquake source model represents and how to read its data.

Reference model · not a forecast
Modelled magnitudeMw 6.8

The range of earthquake sizes represented by the whole model.

Chance within 30 years0.33%

The long-term chance that an earthquake represented by this model occurs within that period.

Chance within 50 years0.55%

The long-term chance that an earthquake represented by this model occurs within that period.

This model in plain language

J-SHIS classifies this as a major active-fault model. It represents the underground area that may rupture along the fault, not one predicted earthquake. The model covers an overall magnitude of Mw 6.8. Its source elements span depths of 2–17.45 km below the surface. Its 30-year long-term probability is 0.33%, not a prediction of a date.

Japan terrain and the source model in 3D

Use the terrain map and city labels to locate the approximate source area, then switch below ground to inspect its generalised extent and depth. It does not reproduce the original source elements or show future epicentres or rupture progression.

Ctrl-drag to tilt · city names remain visible on the map

Colour shows generalised depthShallow2 kmMid-range9.7 kmDeep17.5 km

The 3D terrain gives geographic and city context. The coloured surfaces are coarse regular display cells projected from the underground source area—not the original J-SHIS geometry. They do not show future epicentres or shaking intensity.

How to read the model data

Modelled magnitudeMw 6.8

Magnitude describes the overall size of the modelled earthquake, not the Shindo felt in a particular place. The same magnitude can produce different shaking depending on distance, depth and ground conditions. A range shows both model limits.

Occurrence probability
Within 30 years0.33%Within 50 years0.55%

Probabilities are long-term values in the Y2020 model. They do not predict an earthquake on a particular day, in a particular year or at one exact location. Some models do not provide a value.

Average recurrence interval
6,000 years
A long-term average derived from the activity assessment. It is not a timetable or a countdown to the next event.

Do not subtract the elapsed time from the average interval to calculate a countdown to the next earthquake.

Places where J-SHIS considers this model

In J-SHIS calculations, this model is among the leading earthquake sources for these places. It does not mean the earthquake will start inside their boundaries or that every place would shake in the same way.

  1. Ukiha City
  2. Toho Village
  3. Hita City
  4. Iizuka City
  5. Kama City
  6. Asakura City
  7. Keisen Town
  8. Fukuoka Hakata Ward
  9. Tagawa City
  10. Miyawaka City
  11. Umi Town
  12. Sasaguri Town
Show 40 more places
  1. Shime Town
  2. Sue Town
  3. Hisayama Town
  4. Kasuya Town
  5. Kotake Town
  6. Soeda Town
  7. Itoda Town
  8. Oto Town
  9. Aka Village
  10. Fukuoka Higashi Ward
  11. Fukuoka Chuo Ward
  12. Fukuoka Minami Ward
  13. Nogata City
  14. Chikushino City
  15. Kasuga City
  16. Munakata City
  17. Dazaifu City
  18. Koga City
  19. Fukutsu City
  20. Shingu Town
  21. Chikuzen Town
  22. Fukuchi Town
  23. Oita
  24. Fukuoka
  25. Fukuoka Jonan Ward
  26. Fukuoka Sawara Ward
  27. Kurume City
  28. Nakama City
  29. Ogori City
  30. Onojo City
  31. Kurate Town
  32. Tachiarai Town
  33. Miyako Town
  34. Saga
  35. Tosu City
  36. Kitakyushu Yahatanishi Ward
  37. Yukuhashi City
  38. Mizumaki Town
  39. Onga Town
  40. Nakatsu City

Technical model data

J-SHIS identifiers and calculation parameters. You do not need them for an everyday reading of this page.

Model version
Y2020
The edition of J-SHIS data used on this page.
Probability case
MAX
MAX is the J-SHIS calculation case used on this page. It does not mean a certain ‘worst case’ event.
J-SHIS code
F012203
The identifier used for this model inside J-SHIS.
Estimation method code
PSI
An abbreviation for the statistical process used to calculate probability. It is not a danger grade.
Source elements
1
Source elements are the pieces J-SHIS uses to build the source shape. A larger count means a more detailed or complex model; it is not a hazard score, a fault count or the number of expected earthquakes.
Depth
2–17.45 km
The modelled depth range below the ground surface.
Element length
34 km
The length of individual source elements, not necessarily the total length of a fault zone.
Element width
16 km
The width of the inclined source elements below ground.
Dip angle
75 °
The element’s tilt from horizontal: 0° is horizontal and 90° is vertical.
Strike
136.5 °
The compass direction in which an element extends, measured clockwise from north.
Display grid cells
7
Regular aggregated grid cells used to depict the source area. This is not the number of source records or original shapes.

Source and limitations

Source: J-SHIS, operated by Japan’s National Research Institute for Earth Science and Disaster Resilience (NIED). JISHINDESU organises the Y2020 maximum-case data for presentation. This page is not an earthquake prediction, building-safety assessment or evacuation notice. Use current JMA and local-authority information for safety decisions.

In accordance with the J-SHIS terms, we publish only model-level summaries and coarse display geometry that cannot reproduce the original vertex sequences. This is not a redistributed copy of the source dataset.

Data retrieved: 05/09/2026

Open the source data in J-SHIS ↗J-SHIS terms of use ↗Explore local earthquake history →