Fig. 11

Spatio-temporal evolution of the Château-d'Oex earthquake swarm located in the Préalpes-Romandes region in western Switzerland (see Fig. 2). a Temporal evolution of the swarm imaged by template-matching detections in the period 2007 to 2018 at station AIGLE. Grey lines indicated cumulative sum of template-matching detections and events detected by SED routine processing. Blue histogram shows number of events within bins of 168 h (1 week). b Template-matching detections as a function of magnitude and template (indicated by colours and numbers). The M_LX magnitude is based on amplitudes observed at station AIGLE and was calibrated using M_L magnitudes of larger events. Timeline-plot identifies several bursts of increased seismicity in 2007–2009 and 2016–2018. c Map view of relative relocations considering a subset of well-constrained earthquakes, which occurred in the period 2016–2018. Relative relocations were derived from double-difference techniques in combination with waveform cross-correlation. d Relative relocations projected onto depth profiles AA′, which is oriented perpendicular to the strike of the steeper plane of the first-motion focal mechanism. Focal mechanisms are shown as lower hemisphere projection in map view and projected to the depth profile in cross-section. Colours indicate origin time of the events. Bars indicate relative location errors of hypocentres