Map of the LDG seismic network. Triangles represent operational stations in January 2020. White triangles correspond to vertical-component short-period sensors (CP-Z), blue triangles are 3-component short-period sensors (CP-3C), and red triangles are 3-component broad-band sensors (BH-3C). CP-Z and BH-3C sensors are collocated at nine stations and represented by white triangles with red borders. CP-3C and BH-3C sensors are collocated at two stations and represented by blue triangles with red borders. During the period 2010–2019, BH-3C sensors were installed at stations SAVF, FLAF and ENTF. Gray crosses represent former stations closed before 2010 except for station FRF, which closed in 2016 (see Tab. S1 for more details). Black squares indicate major cities.