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Statistics on location parameters. Data consist in earthquakes recorded between 2010 and 2019 and located not further than 20 km form the French borders or coastlines. Subplots represent histograms and cumulative density for the considered parameter. (a) Distance between the epicenter and the closest station, in kilometers. Histograms are represented for three magnitude classes: ML ≥ 1 (light blue), ML ≥ 2 (royal blue), ML ≥ 3 (dark blue). The black curve represents the cumulative density of all earthquakes with a ML. (b) Minor and major semi-axis of the 95% confidence error ellipse, in kilometers. (c) Number of stations and number of picking phases. (d) Maximum primary and secondary azimuthal gap, in degrees.

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