The invention relates to substructure (1) for increasing the earthquake resistance of at least one high-voltage component (2), in particular a choke coil (3). The substructure (1) comprises a platform (4) which is designed to receive the high-voltage component (2) in a load-bearing manner and which is suspended on a support device (6) of a support structure (7) by means of at least three tensioning means (5). The platform (4) is connected to the tensioning means (5) by means of a first articulated connection (22), and the tensioning means (5) are connected to the support device (6) by means of a second articulated connection (23), said support device (6) being supported on the ground (9) by means of at least three supports (8). The supports (8) are made of high-voltage insulators (11) made of an electrically insulating material, said high-voltage insulators electrically insulating the at least one high-voltage component (2) from the ground potential and supporting the at least one high-voltage component on the ground (9) in a load-bearing manner.