South East France Potentially Active Faults

The supplementary material includes the following files: · SEFPAF.csv : the SEFPAF fault database, including multiple representations of each fault and the corresponding estimated seismic hazard indices. · Fault_model.csv : presents a set of 20 faults selected from SEFPAF using a criteria-based approach based on the proposed seismic hazard indices. · SEFPAF.html : an interactive map of the database, providing a user-friendly interface with fault attributes displayed as pop-up tables (toggle data layer on and click on faults). · SEFPAF_compilation_code.ipynb : the Python code used to compile and process the input datasets as well as to calculate the fault seismic hazard indices. · INPUT.zip : the collection of input datasets, provided as .csv files, used to generate the SEFPAF database. SEFPAF database presents the following fields: Fid, ID, Fault_System, Fault_ID These fields allow for data identification and organisation. The fid value is unique for each entity, ranging from 1 to 2627. Entities are grouped under the same fault ID based on their geological continuity, spatial proximity and shared characteristics. The ID code results from the concatenation of the fields Fault_System and Fault_ID. Faults are grouped by Fault_Systems , namely: Aosta Ranzola, Belledonne - Pelvoux, Central Sub-Alpine Front, Cevennes, Forez, Insubrian line, Jura, Ligure, Ligurian Alps, Massif-Central, Middle Durance, Eastern Pyrenees, Penninic Front, Pilat, Po, Provence, Rhine, Rhône line, Salon-Cavaillon - Ventoux, Southern Alps, Western Sub-Alpine Front, and a unique numeric identifier per fault within each system is given (Fault_ID), ranging from 1 to n faults in the system. Fault systems represent spatially agglomerated structures that share similar geometries, tectonic histories and tectonic regimes, and are therefore expected to exhibit comparable structural and seismotectonic behaviour. This classification may support further analyses on potential combined ruptures and fault mechanisms. Fault_name, NE_name, NE_observations Some entities include the name of the fault (Fault_name) or the name of the neotectonic evidence (NE_name). The latter comprises a numeric code and location as specified in their source database (Baize et al., 2002; Bertrand et al., 2007). We add a parameter for the documented observations of the neotectonic evidences (NE_observations). Source Here we indicate the source dataset reference from where the entity information originates: Geological map of France, Geological map of Switzerland, Geological map of Italy, Terrier et al., 2018, Jomard et al., 2017, Grellet et al., 1993, Comerci et al., 2013, Thouvenot et al., 2003, Sue and Tricart, 2003, Jenatton et al., 2007, Gueguen et al., 2022, Sanchez et al., 2010, Champagnac et al., 2003, Bistacchi and Massironi, 2000, Morelli et al., 2022, Billant et al., 2015, Lallemand, et al., 2024, Thomasset et al., 2024, NEOPAL, IRSN. Trace_rep, WKT, WKT_on_map A single fault may be represented by multiple entities in the dataset, reflecting information compiled from different sources. These entities may provide complementary structural information and, in some cases, slightly different interpretations of the mapped surface fault trace. However, only one representative fault trace is displayed for each unique fault in the SEFPAF map. The Trace_rep field indicates whether an entity is represented on the SEFPAF map, with a value of 1 (true) or 0 (false). WKT is the Well-Known Text geometrical representation in coordinates using the EPSG:4326 - WGS 84 coordinate system. WKT is preserved for each entity; it is a linestring or multilinestring for fault segments, and a point coordinate for neotectonic evidences. WKT_on_map is the column of WKT for entities where Trace_rep is 1, representing the geometries to be displayed on the SEFPAF map. Importance, Reliability Importance and Reliability are attributes that are available only in some of the source datasets. Their coverage is incomplete, and their definitions vary among data sources. The Importance field classifies faults as major (1), secondary (2), or minor (3). The Reliability field reflects the level of confidence in the documented fault attributes, fault trace location, or fault existence, and is expressed on a scale from 0 (uncertain) to 1 (certain). Strike, Dip, Direction, Length, Depth This set of fields represent the geometric parameters of the faults. Strike is the angle of main orientation of the fault trace relative to north, expressed in degrees. Dip is the dip angle of the fault plane relative to the horizontal, also expressed in degrees. Direction informs of which direction the fault dips, expressed in cardinal and intercardinal directions (e.g., N, NE, E). Length and Depth give the dimensions of the fault plane in km. The length is computed after the WKT geometry while the depth comes from the source dataset when documented. Data on fault geometry is scarce in SEFPAF, and it is primarily provided by Jomard et al. (2017) and some fault-specific studies. NeoAge, Kinematics, SlipRate These fields gather information on the fault’s last activity age, its kinematics and slip rate when available. NeoAge stands for neotectonic age of last documented rupture, the values of this field are expressed in text for geological periods, series, ages or glacial-interglacial phases. The Kinematics field describes the most recent sense of fault motion, indicating the vertical component as normal (N) or reverse (R), followed by the parallel component, after ‘/’, and expressed as strike-slip (SS) -left-lateral (-S) or -right-lateral (-D), when oblique. This parameter is provided in most input datasets but it is far from being available for all faults. The SlipRate is the displacement rate on the fault in mm yr-1, estimated from geological offsets or geodetic data. Slip-rate estimates are available for only a limited number of faults and are primarily derived from Jomard et al. (2017) and some fault-specific studies (e.g., Billant et al., 2015; Lallemand et al., 2024). N, S, GD, D These fields correspond to the indices proposed to support fault selection for seismic hazard assessments. N denotes the Neotectonic activity index, S, the near-fault Seismicity index, GD, the near-fault Geodetic Deformation index, and D, the Documentation index. The N index ranges from 0 to 3, representing fault activity from undocumented or pre-Pliocene to historical or instrumentally recorded. The S index ranges from 0 to 4 and represents logarithmic classes of the maximum seismic flux cell intersected by the fault. The GD index ranges from 0 to 4 and represents classes of the maximum geodetic strain amplitude cell intersected by the fault. The D index ranges from 0 to 3, reflecting the level of fault documentation from undocumented to well documented. Because a single fault may be represented by multiple entities in SEFPAF, each fault is assigned the highest index value recorded among its constituent entities.