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

Jomard, Hervé; Cushing, Edward Marc; Palumbo, L.; Baize, Stéphane; David, C.; Chartier, Thomas

doi:10.5194/nhess-2017-96

Cited by 13 publications

(32 citation statements)

References 15 publications

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“…1) in the immediate vicinity of the NE-SW trending La Rouvière fault (LRF) 4 . This fault was not identified as a potentially active fault in the French Active Fault database (BDFA) 5 . Only the two main bounding faults of the CFS, called the Cevennes Fault (CF) and the Marsanne Fault (MF) (see Fig.…”

Section: Resultsmentioning

confidence: 99%

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Surface rupture and shallow fault reactivation during the 2019 Mw 4.9 Le Teil earthquake, France

Ritz

Baize

Ferry

et al. 2020

Commun Earth Environ

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The Rhône River Valley in France, a densely populated area with many industrial facilities including several nuclear power plants, was shaken on November 11th 2019, by the Mw 4.9 Le Teil earthquake. Here, we report field, seismological and interferometric syntheticaperture radar observations indicating that the earthquake occurred at a very shallow focal depth on a southeast-dipping reverse-fault. We show evidence of surface rupture and up to 15 cm uplift of the hanging wall along a northeast-southwest trending discontinuity with a length of about 5 km. Together, these lines of evidence suggest that the Oligocene La Rouvière fault was reactivated. Based on the absence of geomorphic evidence of cumulative compressional deformation along the fault, we suggest that it had not ruptured for several thousand or even tens of thousands of years. Our observations raise the question of whether displacement from surface rupture represents a hazard in regions with strong tectonic inheritance and very low strain rates.

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Section: Resultsmentioning

confidence: 99%

“…1), were considered as potentially active left-lateral strike-slip faults, based on preliminary interpretations of offset geomorphic markers or variations of thickness in quaternary deposits (see ref. 5…”

Section: Resultsmentioning

confidence: 99%

Surface rupture and shallow fault reactivation during the 2019 Mw 4.9 Le Teil earthquake, France

Ritz

Baize

Ferry

et al. 2020

Commun Earth Environ

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“…Potentially active faults are from the BDFA database (Jomard et al, 2017). Epicentral locations of the November 11, 2019 provided by various seismological centers (red stars).…”

Section: Resultsmentioning

confidence: 99%

“…3a). These two faults are included in the Potentially Active Faults Data Base (BDFA ; Jomard et al, 2017). The InSAR interferogram indicates uplift of the SE block and subsidence of the NW one, i.e.…”

Section: The Mw 49 Le Teil Earthquake: Rapid Information On Earthquamentioning

confidence: 99%

Rapid response to the Mw 4.9 earthquake of November 11, 2019 in Le Teil, Lower Rhône Valley, France

Cornou¹,

Ampuero²,

Aubert³

et al. 2020

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On November 11, 2019, a Mw 4.9 earthquake hit the region close to Montelimar (lower Rhône Valley, France), on the eastern margin of the Massif Central close to the external part of the Alps. Occuring in a moderate seismicity area, this earthquake is remarkable for its very shallow focal depth (between 1 and 3 km), its magnitude, and the moderate to large damages it produced in several villages. InSAR interferograms indicated a shallow rupture about 4 km long reaching the surface and the reactivation of the ancient NE-SW La Rouviere normal fault in reverse faulting in agreement with the present-day E-W compressional tectonics. The peculiarity of this earthquake together with a poor coverage of the epicentral region by permanent seismological and geodetic stations triggered the mobilisation of the French post-seismic unit and the broad French scientific community from various institutions, with the deployment of geophysical instruments (seismological and geodesic stations), geological field surveys, and field evaluation of the intensity of the earthquake. Within 7 days after the mainshock, 47 seismological stations were deployed in the epicentral area to improve the Le Teil aftershocks locations relative to the French permanent seismological network (RESIF), monitor the temporal and spatial evolution of microearthquakes close to the fault plane and temporal evolution of the seismic response of 3 damaged historical buildings, and to study suspected site effects and their influence in the distribution of seismic damage. This seismological dataset, completed by data owned by different institutions, was integrated in a homogeneous archive and distributed through FDSN web services by the RESIF data center. This dataset, together with observations of surface rupture evidences, geologic, geodetic and satellite data, will help to unravel the causes and rupture mechanism of this earthquake, and contribute to account in seismic hazard assessment for earthquakes along the major regional Cévenne fault system in a context of present-day compressional tectonics.

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“…At the scale of metropolitan France (i.e., not including the French overseas territories, several of which experience significant seismic activity), discriminating whether a fault is considered as active is still not straightforward and may depend on scientific or regulatory issues (Jomard et al, 2017). The database of potentially active faults (BDFA) includes faults showing evidence of Miocene or younger deformation, assuming the tectonic stress field has not experienced dramatic changes since the end of the Miocene (Jomard et al, 2017;Mazotti et al, 2020). The BDFA aims at recognizing potential seismogenic faults within 50 km of nuclear facilities.…”

Section: -Introductionmentioning

confidence: 99%

Assessing post-pliocene deformation in a context of slow tectonic deformation: insights from paleoseismology, remote sensing and shallow geophysics in Provence, France

et al. 2020

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The Provence region, located in the southeast of France, has experienced a few destructive earthquakes during the last centuries, such as the 1909 Lambesc earthquake or the 1509 and 1708 Manosque earthquakes. However, faults in the area experience slow slip rates (< 0.1 mm/yr) that preclude quantification of deformation using geodetic measurements. Active faults in Provence have long recurrence intervals and the region experiences erosion under a Mediterranean climate where surface markers of such deformation are rapidly erased. As a consequence, several faults in the region may go unnoticed despite having the potential to generate earthquakes. This work focuses on the Vinon-sur-Verdon area in Provence, where a relatively narrow fault structure, the Maragrate fault, brings into contact Miocene clays and Pliocene conglomerates. Because of its proximity to a major nuclear research facility, this fault poses a potential earthquake hazard that justifies studies aimed at gaining insight into its mechanics and Quaternary seismic activity. In this context, a multi

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

Cited by 13 publications

References 15 publications

Surface rupture and shallow fault reactivation during the 2019 Mw 4.9 Le Teil earthquake, France

Surface rupture and shallow fault reactivation during the 2019 Mw 4.9 Le Teil earthquake, France

Rapid response to the Mw 4.9 earthquake of November 11, 2019 in Le Teil, Lower Rhône Valley, France

Assessing post-pliocene deformation in a context of slow tectonic deformation: insights from paleoseismology, remote sensing and shallow geophysics in Provence, France

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