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Original locations and associated phase picks are available through the BCSF-Renass catalog (https://www.franceseisme.fr/donnees/autres.html).

Absolute locations have been determined using the "che" program that jointly invert for the hypocenter locations and Earth structure using a Monte-Carlo Markov Chain algorithm (Haugmard, 2016; Alloncle et al., 2025). The catalog includes 606 aftershocks recorded between June 17th 2026 and September 26th 2026. Each Earth structure parameter associated with each location is indicated in the table.

Relative relocations have been computed from the absolute "che" catalog using the HypoDD software (Waldhauser and Ellsworth, 2000). Among the 606 seismic events considered in the absolute catalog, 564 well constrained events have been relocated between June 17th 2026 and September 26th 2026, using a 1D mean model inferred from the inversion results of the absolute locations (3 layers with top boundaries at 0, 20 and 30 km associated respectively with layer velocities of 5.59, 6.5 and 8.2 km/s and a VP/VS ratio of 1.64). x_east, y_north and z_depth are locations (m) relative to cluster centroid (46.194870°N; -0.721276°E; 5.879635 km deep). ncat_P and ncat_S are the number of catalog P- and S-wave data.

References: 
Alloncle, M., Bonnin, M., &amp; Mocquet, A. (2025). Earthquake Source Spectra and Site Attenuation in Northwestern France. Bulletin of the Seismological Society of America, 115(3), 965-982. doi : https://doi.org/10.1785/0120240122

Haugmard, M. Détermination non-linéaire des paramètres hypocentraux et structuraux : application à la sismicité intracontinentale du Massif armoricain.  PhD thesis, Université de Nantes, 2016

Waldhauser, F. and Ellsworth, W. L.  A double-difference earthquake location algorithm: method and application to the northern Hayward Fault, California.  Bulletin of the Seismological Society of America, 90(6):1353–1368, Dec. 2000.  doi: 10.1785/0120000006.</gco:CharacterString>
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