Fig. 11
From: Earthquakes in Switzerland and surrounding regions during 2013
Displacement seismograms of the ML 4.1 Balzers mainshock (red), the ML 3.7 Balzers aftershock (black), and the ML 2.9 Bad Ragaz event of 2005 (grey) recorded on vertical components at the national high-gain stations WILA, SLE, BALST (see Fig. 1). The signals are filtered with a 1–30 Hz, 2nd order, Butterworth band-pass filter. The time window in the upper panel includes P and S waves, the time window in the lower panel is focused on the P wave. Numbers next to the seismograms indicate the epicentral distance. The high degree in similarity between the ML 4.1 mainshock and the ML 3.7 aftershock, especially the S–P and PmP-Pg times, suggests that both events have similar source locations and focal mechanisms. The general similarity with the Bad Ragaz event suggests a similar source region for both sequences