Results of the moment magnitude calculation. (a) Distribution of moment magnitudes along a profile (line 01, cp. Fig. 5) perpendicular to the trench axis. (b) Distribution of moment magnitudes with depth for events in >20 km distance from the trench axis and (c) in <20 km distance, respectively. The meaning of the colour-shaded areas in (c) is: the purple area shows a scalar seismic moment of 8.1 × 10¹¹ Nm km⁻¹; the green-shaded area a scalar moment of 4.1 × 10¹¹ Nm km⁻¹; the grey area a scalar moment of 29.1 × 10¹¹ Nm km⁻¹; (d) b-factors for all events. ‘MAT’ denotes the Middle America Trench Axis. Bending points of the red and the blue line differ slightly from each other, which indicates the catalogue for events close to the trench (red line) is more complete. Most likely this is due to the higher density of seismic stations close to the trench (cp. Fig. 1).