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J-SHIS EARTHQUAKE SOURCE MODEL

Median Tectonic Line (MTL) fault zone (FROM Negoro segment TO Ishizuchi-sanmyaku-hokuen segment)

中央構造線断層帯（根来区間～石鎚山脈北縁区間が同時に活動）

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

Reference model · not a forecast
Modelled magnitudeMw 7.7

The range of earthquake sizes represented by the whole model.

Chance within 30 years—

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

Chance within 50 years<0.01%

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 7.7. Its source elements span depths of 2–16 km below the surface. It considers 2 rupture patterns; this is not the number of expected earthquakes.

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 kmDeep16 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 7.7

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 years—Within 50 years<0.01%

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.

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. Mihama Town
  2. Totsukawa Village
  3. Shirahama Town
  4. Tanabe, Tanabe City
  5. Tenkawa Village
  6. Nosegawa Village
  7. Wake Town
  8. Osakikamijima Town
  9. Aki City
  10. Toyo Town
  11. Yasuda Town
  12. Geisei Village
Show 48 more places
  1. Okawa Village
  2. Nakatosa Town
  3. Minoh City
  4. Aioi City
  5. Nishiwaki City
  6. Ichikawa Town
  7. Kamigori Town
  8. Minabe Town
  9. Ibara City
  10. Takehara City
  11. Motoyama Town
  12. Koya Town
  13. Inami Town
  14. Mugi Town
  15. Niihama City
  16. Saijo City
  17. Kami City
  18. Otoyo Town
  19. Kyoto Yamashina Ward
  20. Kobe City Kita Ward
  21. Kimino Town
  22. Okayama Naka Ward
  23. Yakage Town
  24. Fukuyama City
  25. Higashihiroshima City
  26. Kamikatsu Town
  27. Nankoku City
  28. Konan City
  29. Kameoka City
  30. Nantan City
  31. Fukusaki Town
  32. Asuka Village
  33. Kasaoka City
  34. Bizen City
  35. Akaiwa City
  36. Satosho Town
  37. Naka Town
  38. Minami Town
  39. Kaiyo Town
  40. Kyoto Shimogyo Ward
  41. Kyoto Ukyo Ward
  42. Uda City
  43. Heguri Town
  44. Yoshino Town
  45. Shimoichi Town
  46. Gobo City
  47. Kawabe, Hidakagawa Town
  48. Okayama Kita Ward

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
F0201CG
The identifier used for this model inside J-SHIS.
Estimation method code
SIM
An abbreviation for the statistical process used to calculate probability. It is not a danger grade.
Source elements
10
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
2–16 km
The modelled depth range below the ground surface.
Element length
28–86 km
The length of individual source elements, not necessarily the total length of a fault zone.
Element width
12–18 km
The width of the inclined source elements below ground.
Dip angle
40–90 °
The element’s tilt from horizontal: 0° is horizontal and 90° is vertical.
Strike
253.9–258.5 °
The compass direction in which an element extends, measured clockwise from north.
Rupture patterns
2
Alternative rupture arrangements or sequences considered by the model.
Display grid cells
73
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 →