sigma 3 Overview
SIGMA3 is a research and development (R&D) program on SeIsmic hazard and Ground Motion Assessment. It is the 3rd part of a larger R&D initiative initiated since 2011 to support innovation in the field of probabilistic hazard assessment (PSHA). SIGMA3 is funded at 100% by the industry. The program grounds its roots in the methodological developments, but also on the identified shortcomings of the two preceding editions labelled SIGMA and SIGMA2.
The previous two programs have led to insightful datasets and models to accompany the inception of probabilistic site-specific PSHA studies in low-to-moderate seismicity areas, such as France, for instance. However, nowadays additional progress is still needed to reduce epistemic uncertainties and improve the confidence in probabilistic seismic hazard studies. To this end, SIGMA3 gathers a group of researchers and engineers actively involved the seismic hazard community and recognized for their expertise.
Work packages (wp)
In order to improve the reliability of seismic hazard assessment, it is necessary to better quantify and reduce the uncertainties associated to seismic sources characterization for hazard calculations, which involves developing methods to refine our knowledge about faults and seismicity.
Thus, WP1 focuses on (1) developing methods to characterize faults in stable areas in terms of detection, and deformation measurement and dating; (2) improving the earthquake catalogues in terms of depth and magnitude estimation; (3) developing innovative tools for frequency-magnitude relationship characterization, and finally (4) producing series of tools for PFDHA to reflect the specificities of intraplate region.
Magni dolorum quidem ipsam eligendi, totam, facilis laudantium cum accusamus ullam voluptatibus commodi numquam, error, est. Ea, consequatur. Magni dolorum quidem ipsam eligendi, totam, facilis laudantium cum accusamus ullam voluptatibus commodi numquam, error, est. Ea, consequatur. Magni dolorum quidem ipsam eligendi, totam, facilis laudantium cum accusamus ullam voluptatibus commodi numquam, error, est. Ea, consequatur.
Work Package 3, titled Soil Dynamics, straddles Work Packages 2 and 4. Aligned with the overarching goals of the SIGMA3 project, this package focuses on the site response component of the seismic hazard assessment, specifically at scales ranging from a few meters to several hundred meters.
The primary aim of WP3 is to enhance the reliability of seismic site response and to investigate the interplay between seismic hazards and engineering practices. This involves developing and testing advanced techniques for soil parameter characterization, conducting numerical sensitivity analyses, exploring methods to mitigate seismic amplification, and improving liquefaction quantification in areas with low-to-moderate seismicity. Additionally, there are numerous other actions designed to achieve the main objectives of WP3, ultimately contributing to more accurate and effective seismic hazard assessments.
Work package 4, titled Hazard and load calculation, has the goal to improve different aspects of the methods and tools used for probabilistic hazard assessment (PSHA) and an extension of the latter approach for considering vector hazard, aftershocks and fault displacement. It also addresses new approaches for epistemic uncertainty characterization and propagation, as well as the confrontation of PSHA to observations. These observations are extracted from different sources, such as instrumental, historical and fragile geological structures survival, to inform and update hazard models. The WP4 also makes sure that hazard output complies with engineering needs by developing improved and new approaches for the definition of seismic loads and their impact on seismic risk analyses (spectra, accelerograms, intensity measures, scenarios).
The goal of the Work Package 5 is to create a versatile toolset named QuakeTest, designed to manipulate, verify and evaluate models representing the fundamental components of earthquake ground motion—source, ground motion, and site effects—within Probabilistic Seismic Hazard Analysis (PSHA) computations. QuakeTest will leverage advanced simulation techniques to efficiently propagate uncertainties, whether explicitly or implicitly accounted for in the models under evaluation. This capability has earned it the moniker “simulation platform.” Beyond model validation, QuakeTest will excel in manipulating existing data for reference purposes or as input for data analysis tasks such as regressions and visual representations.
In order to improve the reliability of seismic hazard assessment, it is necessary to better quantify and reduce the uncertainties associated to seismic sources characterization for hazard calculations, which involves developing methods to refine our knowledge about faults and seismicity.
Thus, WP1 focuses on (1) developing methods to characterize faults in stable areas in terms of detection, and deformation measurement and dating; (2) improving the earthquake catalogues in terms of depth and magnitude estimation; (3) developing innovative tools for frequency-magnitude relationship characterization, and finally (4) producing series of tools for PFDHA to reflect the specificities of intraplate
MOTIVATION AND MOTIVATION
Magni dolorum quidem ipsam eligendi, totam, facilis laudantium cum accusamus ullam voluptatibus commodi numquam, error, est. Ea, consequatur. Magni dolorum quidem ipsam eligendi, totam, facilis laudantium cum accusamus ullam voluptatibus commodi numquam, error, est. Ea, consequatur. Magni dolorum quidem ipsam eligendi, totam, facilis laudantium cum accusamus ullam voluptatibus commodi numquam, error, est. Ea, consequatur.
Work Package 3, titled Soil Dynamics, straddles Work Packages 2 and 4. Aligned with the overarching goals of the SIGMA3 project, this package focuses on the site response component of the seismic hazard assessment, specifically at scales ranging from a few meters to several hundred meters.
The primary aim of WP3 is to enhance the reliability of seismic site response and to investigate the interplay between seismic hazards and engineering practices. This involves developing and testing advanced techniques for soil parameter characterization, conducting numerical sensitivity analyses, exploring methods to mitigate seismic amplification, and improving liquefaction quantification in areas with low-to-moderate seismicity. Additionally, there are numerous other actions designed to achieve the main objectives of WP3, ultimately contributing to more accurate and effective seismic hazard assessments.
MOTIVATION AND MOTIVATION
Magni dolorum quidem ipsam eligendi, totam, facilis laudantium cum accusamus ullam voluptatibus commodi numquam, error, est. Ea, consequatur. Magni dolorum quidem ipsam eligendi, totam, facilis laudantium cum accusamus ullam voluptatibus commodi numquam, error, est. Ea, consequatur. Magni dolorum quidem ipsam eligendi, totam, facilis laudantium cum accusamus ullam voluptatibus commodi numquam, error, est. Ea, consequatur.
The goal of the Work Package 5 is to create a versatile toolset named QuakeTest, designed to manipulate, verify and evaluate models representing the fundamental components of earthquake ground motion—source, ground motion, and site effects—within Probabilistic Seismic Hazard Analysis (PSHA) computations. QuakeTest will leverage advanced simulation techniques to efficiently propagate uncertainties, whether explicitly or implicitly accounted for in the models under evaluation. This capability has earned it the moniker “simulation platform.” Beyond model validation, QuakeTest will excel in manipulating existing data for reference purposes or as input for data analysis tasks such as regressions and visual representations.