Fig. 10
From: Earthquakes in Switzerland and surrounding regions during 2013
Ground motions records of the ML 4.1 Balzers mainshock of December 12th (a) Restituted acceleration seismograms recorded at the national strong-motion stations SBUB, SBUH, and SBUA2 (NS-component, 11–13 km epicentral distance). Signals are filtered with a 0.33–100 Hz, 4th order, Butterworth band-pass filter. Seismograms of station SBUH and SBUA2 were offset by −0.2 and −0.4 ms−2, respectively. Note the larger amplitude at stations on sediments (SBUH, SBUA2) compared to the hard rock site (SBUB). b Velocity seismograms obtained after integration of the acceleration recording at station LIENZ (black; at 26 km distance) and SCUG (red at 23 km distance). Restitution to ground acceleration and band-pass filtering (0.33–100 Hz, 4th order, Butterworth) was applied before integration. North–South and Up–Down channels were offset by −0.001 and −0.002 ms−1, respectively. Note the relatively long-period waves starting at about 10–11 s after origin time at station SCUG, which are associated to the basin response