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J-SHIS EARTHQUAKE SOURCE MODEL

Keihanna-kyuryo flexure zone

京阪奈丘陵撓曲帯

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

Reference model · not a forecast
Modelled magnitudeJMA 7.1

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—

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 an 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 JMA 7.1. Its source elements span depths of 3–18 km below the surface.

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 depthShallow3 kmMid-range10.5 kmDeep18 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 magnitudeJMA 7.1

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—

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
7,600 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. Sango Town
  2. Ikoma City
  3. Kashiba City
  4. Kammaki Town
  5. Kawai Town
  6. Seika Town
  7. Nara
  8. Western Nara City
  9. Tenri City
  10. Heguri Town
  11. Ikaruga Town
  12. Oji Town
Show 48 more places
  1. Kizugawa City
  2. Ide Town
  3. Kashiwara City
  4. Habikino City
  5. Fujiidera City
  6. Yamatokoriyama City
  7. Ando Town
  8. Koryo Town
  9. Kyotanabe City
  10. Matsubara City
  11. Yamatotakada City
  12. Joyo City
  13. Ujitawara Town
  14. Osaka Taisho Ward
  15. Osaka Higashisumiyoshi Ward
  16. Higashiosaka City
  17. Shijonawate City
  18. Katano City
  19. Osaka Miyakojima Ward
  20. Osaka Fukushima Ward
  21. Osaka Nishi Ward
  22. Osaka Higashinari Ward
  23. Osaka Ikuno Ward
  24. Osaka Asahi Ward
  25. Neyagawa City
  26. Daito City
  27. Settsu City
  28. Kashihara City
  29. Tawaramoto Town
  30. Kyoto Fushimi Ward
  31. Kumiyama Town
  32. Wazuka Town
  33. Osaka
  34. Osaka Minato Ward
  35. Osaka Hirano Ward
  36. Moriguchi City
  37. Hirakata City
  38. Yao City
  39. Miyake Town
  40. Kyoto
  41. Kyoto Shimogyo Ward
  42. Kyoto Minami Ward
  43. Uji City
  44. Muko City
  45. Yawata City
  46. Osaka Joto Ward
  47. Osaka Tsurumi Ward
  48. Osaka Suminoe 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
G030116
The identifier used for this model inside J-SHIS.
Estimation method code
POI
An abbreviation for the statistical process used to calculate probability. It is not a danger grade.
Source elements
2
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
3–18 km
The modelled depth range below the ground surface.
Element length
3.4–20.4 km
The length of individual source elements, not necessarily the total length of a fault zone.
Element width
15 km
The width of the inclined source elements below ground.
Dip angle
90 °
The element’s tilt from horizontal: 0° is horizontal and 90° is vertical.
Strike
194.6–252.5 °
The compass direction in which an element extends, measured clockwise from north.
Display grid cells
4
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 →