Fig. 1
From: Earthquakes in Switzerland and surrounding regions during 2017 and 2018
Seismograph stations in Switzerland and surrounding regions with on-line data acquisition operational at the end of 2018. Stations of the “Switzerland Seismological Network” (network code “CH”) are indicated with labels. The stations defined as high-gain (HG) are mostly equipped with broad-band or short period (mostly 5 s) seismometers and may also include accelerometers. The strong-motion stations (SM) only have accelerometers (see also Additional file 1: Tables S1–S3). Symbols outlined by blue colour indicate seismometer or accelerometers installed in 2017. Green outline indicates stations installed in 2018. Yellow triangles mark additional permanent or temporary stations with real-time data acquisition that are used to improve detection and location of seismicity. Colours projected onto the topographic relief in the background show the lateral variation of the magnitude of completeness (MC) for on-line stations operating at the end of 2018, assuming a detection probability of 0.99, a minimum number of 6 automatic triggers, and a hypothetical focal depth of 5 km. Bold, white lines indicate MC contours of 1.0, 1.5 and 2.0