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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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ACTIVE FAULT
CHARACTERIZATION

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SITE CHARACTERIZATION AND SEISMIC MONITORING

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TECHNICAL REVIEW 

AND EXPERTISE

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RESEARCH AND DEVELOPMENT PROGRAMS

OUR SERVICES
seismic hazard
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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-histories development

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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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active fault
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ACTIVE FAULT CHARACTERIZATION

Our principal staff is expert in active fault characterization studies to implement PFDHA models, in compliance with various standards and regulations for a variety of geological contexts worldwide.

  • Morphotectonics analysis on high-resolution topography (LiDAR, drone, satellite imagery)

  • Expertise in fieldwork reconnaissance and paleoseismological trenching

  • Processing and interpretation of sub-surface geophysical data (GPR, electric, seismic data)

  • Fault sampling (core drilling, trenching) for multi-approach dating

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SITE  CHARACTERIZATION

AND SEISMIC MONITORING

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  • Design and supervision of site investigation programs

  • Soil response analyses (empirical, numerical)

  • Liquefaction and induced hazard evaluation

  • Seismic microzonation

  • Geophysical investigations for site characterization

  • Assistance for the deployment of seismic monitoring and automatic shutdown systems 

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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

site
expertise
RetD
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