Transposing an active fault database into a seismic hazard fault model for nuclear facilities – Part 1: Building a database of potentially active faults (BDFA) for metropolitan France

Abstract

Abstract. The French Institute for Radiation Protection and Nuclear Safety (IRSN), with the support of the Ministry of Environment, compiled a database (BDFA) to define and characterize known potentially active faults of metropolitan France. The general structure of BDFA is presented in this paper. BDFA reports to date 136 faults and represents a first step toward the implementation of seismic source models that would be used for both deterministic and probabilistic seismic hazard calculations. A robustness index was introduced, highlighting that less than 15 % of the database is controlled by reasonably complete data sets. An example of transposing BDFA into a fault source model for PSHA (probabilistic seismic hazard analysis) calculation is presented for the Upper Rhine Graben (eastern France) and exploited in the companion paper (Chartier et al., 2017, hereafter Part 2) in order to illustrate ongoing challenges for probabilistic faultbased seismic hazard calculations.

The Active Faults of Eurasia Database

“…Сре-ди них есть региональные и обобщающие работы, изданные в виде бумажных карт или электронных баз данных. Таковы карты Италии [Galadini et al, 2001], Турции [Emre et al, 2013], Сирии [Trifonov, Ammar, 2012], Ирана [Hessami et al, 2003], Филиппин [Distribution of Active Faults…, 2008], Таиланда [Kosuwan et al, 2006], а также базы данных для Южной Европы [Basili et al, 2013], Иберийского полуостро-ва [García-Mayordomo et al, 2012], Франции [Jomard et al, 2017], Афганистана [Ruleman et al, 2007], Во-сточной Сибири [Lunina, 2016], Тибетско-Гималай-ского региона [Taylor, Yin, 2009] и др. Каждый из этих материалов содержит ценную информацию, однако они составлены по разным методикам и в разных форматах, имеют разную точность отобра-жения объектов, разные число и смысл фиксируе-мых параметров, различаются пониманием терми-на «активный разлом» и в результате трудно сопо-ставимы.…”

Preface: Linking faults to seismic hazard assessment in Europe

“…This special issue includes 11 papers focused on data gathering (García-Mayordomo et al, 2017;Hintersberger et al, 2018;Jomard et al, 2017) as well as seismic and surface rupture hazard modelling (Avital et al, 2018;Valentini et al, 2017;Chartier et al, 2017a, b;Gülerce et al, 2017;Azzaro et al, 2017;Peruzza et al, 2017;Boncio et al, 2018).…”

“…Jomard et al (2017) and Chartier et al (2017a) are two companion papers devoted to the development of an active fault database for metropolitan France (Part 1) and its transposition into a fault model for probabilistic seismic hazard analysis in the Upper Rhine Graben (Part 2).…”

Transposing an active fault database into a fault-based seismic hazard assessment for nuclear facilities – Part 2: Impact of fault parameter uncertainties on a site-specific PSHA exercise in the Upper Rhine Graben, eastern France

“…All the fault data used in this study are available in the faults database presented in Part 1 (Jomard et al, 2017).…”

“…We perform a fault-based probabilistic seismic hazard assessment (PSHA) exercise in the Upper Rhine Graben to quantify the relative influence of fault parameters on the hazard at the Fessenheim nuclear power plant site. Specifically, we show that the potentially active faults described in the companion paper (Jomard et al, 2017, hereafter Part 1) are the dominant factor in hazard estimates at the low annual probability of exceedance relevant for the safety assessment of nuclear installations. Geological information documenting the activity of the faults in this region, however, remains sparse, controversial and affected by a high degree of uncertainty.…”