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Fig. 2


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Instrumental seismicity in metropolitan France. (a) Map of the extended SI-Hex catalogue (1962–2018). Colored circles indicate earthquake magnitudes Mw. (b) Number of recorded earthquakes per year. (c) Cumulative magnitude-frequency distribution of seismicity. Solid circles: Instrumental SI-Hex catalogue (1962–2018), Mw ≥ 2.5. Solid triangles: historical & instrumental FCAT17 catalogue (Manchuel et al., 2018), Mw ≥ 4.0. Dotted and dashed grey lines show best-fit Gutenberg-Richter models for each catalogue, with the double-head arrow indicating an apparent offset of 0.5 magnitude point.

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