The NIED 2012 Seismic Hazard Model for Japan

The Japan national model is well described in the online report prepared by the National Research Institute for Earth Science and Disaster Prevention (NIED), downloadable from the Japan Seismic Hazard Information Station website

The files describing this model are accessible at this link whereas the .pdf describing their format can be downloaded here.

The NIED 2012 seismic source model consists of a single model containing different source typologies:

  • Gridded seismicity
  • Characteristic faults
  • Discretized faults
  • Discretized sources

The figure below shows gridded seismicity, containing about 32000 point sources uniformly distributed over the Japanese territory and its surroundings. It is used to model interface earthquakes, intra-slab seismicity and seismicity in active shallow crust.

 JSHIS-2012 gridded seismicity

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

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 fault is distributed though the J-SHIS Website
1.3 Strong-motion database
1.4 Site characterization database
Notes
2 Methodology for model development
2.1 Scientific participation (SSHAC levels) and review process
2.2 Documentation describing model preparation
2.3 Codes used for model preparation Not available
Notes
3 PSHA input model
3.1 Seismic Source Model
3.1.1 Area sources Not included
3.1.2 Grid sources Included
3.1.3 Crustal faults Included
3.1.4 Subduction faults Included
3.1.5 In-slab seismicity Modelled as XXX
3.1.6 Non-parametric ruptures Included
3.1.7 Magnitude-area scaling relationships
3.2 Ground Motion Model
3.2.0 Tectonic regionalisation Not 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 Not included
3.4.2 Ground Motion Model Not included
3.4.3 Site Response Model Not included
Notes
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: http://www.j-shis.bosai.go.jp/
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: http://www.j-shis.bosai.go.jp/
  • hazard_models/japan_2012_intro.txt
  • Last modified: 2014/12/19 10:24
  • by rgee