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SEISTER
SERVICES

Make safe your asset against

external seismic actions

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SEISMIC HAZARD ASSESSMENT

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 PROBABILISTIC FAULT DISPLACEMENT HAZARD ASSESSMENT (PFDHA)

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RISK AND VULNERABILITY ASSESSMENT

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SITE

CHARACTERIZATION

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TECHNICAL REVIEW 

AND EXPERTISE

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RESEARCH AND DEVELOPMENT PROGRAMS

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OUR SERVICES
 
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SEISMIC HAZARD ASSESSMENT

  • Development of earthquake catalogues

  • Development of seismic source models 

  • Development of ground motion models and adjustments

  • Complex logic trees 

  • Site-specific approach to optimize the definition of the design level

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  • Optimization of the 3D geometry (subduction/faults)

  • Extensive sensitivity analyses and deaggregation

  • Fractal decomposition of the calculation

  • Non-ergodic models

  • Time-history development

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This is our core service.
Our principal staff has managed or conducted a large number of seismic hazard assessment studies in compliance
with various standards and regulations for a variety of project worldwide. Our client-focused approach allows
to optimize the technical solutions for the economic benefit of the project.

 
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 PROBABILISTIC FAULT DISPLACEMENT

HAZARD ASSESSMENT (PFDHA)

  • Development of a V&V software to conduct Probabilistic Fault Displacement Hazard (IAEA, safety report n85) where active and capable faults are identified in the near regional scale

  • Accounting for (1) both primary and secondary faulting (2) epistemic and aleatory variability and (3) complex fault geometries

  • Handling complex logic-tree to capture Center Body and Range

  • Investigating the key parameters controlling the hazard variability in terms of annual probability exceedance

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RISK AND VULNERABILITY ASSESSMENT

Our team offers seismic risk assessment services for the conception of risk management solutions tailored

to the specificities of our client’s assets exposed to seismic hazard.

The services include the vulnerability assessment of buildings, of pipelines and elements at risk, the quantification of risk through losses parameters and the definition of risk mitigation and reinforcement solutions based on cost/benefit analysis.

Our methodologies have been applied for a variety of assets from the scale of individual building, to the scale of cities and countries. Our team and partners combine skills from various disciplines: Seismology, engineering seismology, seismic monitoring, seismic hazard, vulnerability diagnosis, structural damages and losses assessment, seismic risk, seismic measurements and retrofitting solutions.

SITE  CHARACTERIZATION

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  • Design and supervision of site investigation programs

  • Soil response analyses (empirical, numerical)

  • Liquefaction and induced hazard evaluation

  • Seismic microzonation

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TECHNICAL REVIEW AND EXPERTISE

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  • Our Principal staff is constantly involved in technical reviews and advisory activity
    for critical projects around the globe. 

  • We provide technical advices, training courses for regulatory bodies and peer reviews
    for seismic hazard assessments for existing or new sites in many countries.

  • We are actively involved in the nuclear industry working groups of the IAEA and recognized authorities on the assessment of seismic hazard throughout the world.

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RESEARCH AND DEVELOPMENT PROGRAMS

  • R&D actions are paramount to produce cutting-edge science results and to provide our clients with the most effective and innovative solutions.

  • Thanks to our background and specific skills we have been involved in several R&D national and international programs related to seismic hazard and risk assessments.

  • We have experience in leading R&D tasks and developing software and methodologies that have been subsequently applied in industry. 

Software development:  
SHEAR (Seismic Hazard EnhAnced seRvices)

In-house FORTRAN-90 Software to perform state-of-the-art PSHA,
DSHA and PFDHA calculations using complex logic-trees. 

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  • Complex source zone geometries (volumes, faults, subduction)

  • Calculating activity rates and corresponding uncertainties;

  • Handle zoning or zone-less approaches

  • CAV filtering

  • Source disaggregation and total disaggregation

  • Sensitivity analyses

  • Sanity check : equivalent strain rates associated to the combinations of a-, b- values and Mmax
    for comparison to the geodetic strain rates

  • Providing various types of results tailored to the requirements of designers

  • Parallel and fractal calculations for computation time efficiency of complex logic trees