SEISTER
SERVICES
Make safe your asset against
external seismic actions
OUR SERVICES
SEISMIC HAZARD ASSESSMENT
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Development of earthquake catalogues
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Development of seismic source models
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Development of ground motion models and adjustments
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Complex logic trees
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Site-specific approach to optimize the definition of the design level
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Optimization of the 3D geometry (subduction/faults)
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Extensive sensitivity analyses and deaggregation
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Fractal decomposition of the calculation
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Non-ergodic models
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Time-histories development
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.
PROBABILISTIC FAULT DISPLACEMENT
HAZARD ASSESSMENT (PFDHA)
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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
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Accounting for (1) both primary and secondary faulting (2) epistemic and aleatory variability and (3) complex fault geometries
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Handling complex logic-tree to capture Center Body and Range
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Investigating the key parameters controlling the hazard variability in terms of annual probability exceedance
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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.
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Morphotectonics analysis on high-resolution topography (LiDAR, drone, satellite imagery)
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Expertise in fieldwork reconnaissance and paleoseismological trenching
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Processing and interpretation of sub-surface geophysical data (GPR, electric, seismic data)
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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
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Soil response analyses (empirical, numerical)
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Liquefaction and induced hazard evaluation
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Seismic microzonation
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Geophysical investigations for site characterization
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Assistance for the deployment of seismic monitoring and automatic shutdown systems
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.
RESEARCH AND DEVELOPMENT PROGRAMS
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R&D actions are paramount to produce cutting-edge science results and to provide our clients with the most effective and innovative solutions.
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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.
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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)
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Calculating activity rates and corresponding uncertainties;
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Handle zoning or zone-less approaches
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CAV filtering
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Source disaggregation and total disaggregation
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Sensitivity analyses
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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
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Parallel and fractal calculations for computation time efficiency of complex logic trees
