The NIED 2012 Seismic Hazard Model for Japan

The GEM hazard team is currently working in close collaboration with NIED scientists at the implementation of the 2012 (Model 2) PSHA Model for Japan. A proper implementation of this model requires structural changes to the hazard component of the OpenQuake-engine. These improvements will be added in 2015.

The Japan national models are described in the online reports prepared by the National Research Institute for Earth Science and Disaster Prevention (NIED), downloadable from the Japan Seismic Hazard Information Station website. The report for the 2012 version is only available in Japanese; the most recent report available in english is the one describing the 2009 model Fujiwara et al. (2009).

The seismic source model

The NIED 2012 seismic source model contains different source typologies:

  • Rectangular faults [Type 1]
  • Non-rectangular faults [Type 2]
  • Discretised rectangular source faults [Type 3]
  • Discretised rectangular ruptures without specified fault sources [Type 4]
  • Zoning areas

The ground motion model

The NIED 2012 ground motion model includes a single ground motion prediction equation, the Si and Midorikawa (1999, 2000) ground motion prediction equation. This ground motion model computes the ground produced by earthquake sources included in three distinct tectonic environments: earthquakes in active shallow crust, subduction interface events and intraslab events.


  • Fujiwara, H., Kawai, S., Aoi, S., Morikawa, N., Senna, S., Kudo, N., Ooi, M., Hao, K. X., Wakamatsu, K., Ishikawa, Y., Okumura, T., Ishii, T., Matsushima, S., Hayakawa, Y., Toyama, N. and Narita, A. (2009). “Technical reports on national seismic hazard maps for Japan.” Technical note of the National Research Institute for Earth Science and Disaster Prevention, Vol. 336.
  • Si, H. and Midorikawa, S. (1999). New attenuation relationships for peak ground acceleration and velocity considering effects of fault type and site condition. J. Struct. Constr. Eng. AIJ 523, 63–70 (in Japanese with English abstract)
  • Si, H. and Midorikawa, S. (2000). New attenuation relationships for peak ground acceleration and velocity considering effects of fault type and site condition. In Proceedings of the 12th World Conference on Earthquake Engineering Online version

Model summary table

This table summarises the main characteristics of the original implementation of this model

1 Datasets availability
1.1 Earthquake catalogue This model is built using many catalogues most of them available (e.g. Utsu catalogue, JMA catalogue)
1.2 Geological database Information about faults is distributed though the J-SHIS Website
1.3 Strong-motion database There's no direct link between a strong motion database and the GMPEs selected for the calculation of hazard based on this model.
1.4 Site characterization database The database describing local soil condition is available on the J-SHIS Website.
2 Methodology for model development
2.1 Scientific participation (SSHAC levels) and review process The preparation of the model follows a well defined process which involves a large portion of the Japanese scientific community.
2.2 Documentation describing model preparation Many of the methodologies adopted are described in Fujiwara et al. (2009)
2.3 Codes used for model preparation Not available
3 PSHA input model
3.1 Seismic Source Model
3.1.1 Area sources Included
3.1.2 Grid sources Not included
3.1.3 Crustal faults Included
3.1.4 Subduction faults Included
3.1.5 In-slab seismicity Included
3.1.6 Non-parametric ruptures Included
3.1.7 Magnitude-area scaling relationships See Appendix 1 of Fujiwara et al. (2009)
3.2 Ground Motion Model
3.2.0 Tectonic regionalisation Included
3.2.1 Models for active shallow seismicity Included
3.2.2 Models for subduction interface Included
3.2.3 Models for subduction intraslab Included
3.2.4 Models for stable continental regions Not included
3.2.6 Models for volcanic areas Not included
3.3 Site Response Model
3.2.5 Models for deep non-subduction sources Not included
3.3.1 Based on GMPEs Yes
3.3.2 Based on site-response analysis No
3.4 Epistemic uncertainties
3.4.1 Seismic Source Model Included for some sources
3.4.2 Ground Motion Model Not included
3.4.3 Site Response Model Not included
4 Hazard Input Description
4.1 Hazard input document
4.2 Input files Available
Notes Information describing the input can be downloaded from this website:
5 Calculation
5.1 Software Not available
5.2 Results
5.2.1 Hazard curves Available
5.2.2 Hazard maps Available
5.2.3 Uniform hazard spectra Not available
5.2.4 Disaggregation Not available
5.2.5 Stochastic event sets Not available
5.2.6 Ground motion fields Not available
Notes The results of the calculation can be downloaded from this website:
  • japan_2012_intro.txt
  • Last modified: 2015/01/19 16:02
  • by admin