Secondary Perils Analysis using the OQ-MBTK

Landslides and liquefaction are well-known perils that accompany earthquakes. Basic models to describe their occurrence have been around for decades and are constantly improving. However, these models have rarely been incorporated into PSHA.

The tools presented here are implementations of some of the more common and appropriate secondary perils models. The intention is seamless incorporation of these models into PSH(R)A calculations done through the OpenQuake Engine, though the incorporation is a work in progress.

Tools for preparing the data for these models are also presented. This can be a non-trivial challenge, and consistent and correct data preparation is necessary for accurate secondary peril hazard and risk calculations.

Contents:

• Liquefaction and Landslide models
  • Liquefaction models
    • HAZUS
    • Zhu et al (2015)
• Site characterization for probabilistic liquefaction analysis
  • General considerations
    • Spatial resolution and accuracy of data and site characterization
  • HAZUS
    • Liquefaction probabilities
      • Liquefaction suscepibility category
      • Groundwater depth
    • Lateral spreading
  • Zhu et al. 2015 (general model)
    • Getting raster values at sites
    • Liquefaction probabilities
      • Vs30
      • Compound Topographic Index
    • Lateral spreading
• Tutorials for using the OQ-MBTK for analysis of secondary perils
  • Tutorial: Preparing site data for liquefaction analysis with the OQ-MBTK
    • Joining site information to site locations
      • HAZUS site parameters
      • Zhu site parameters
  • Tutorial: Calculating liquefaction probabilities from a single earthquake
    • Liquefaction probabilities using the HAZUS model
    • Liquefaction probabilities using the model from Zhu et al. (2015)
    • Comparison
    • Lateral spreading displacements