The monitoring network newly installed at the beginning of 2018 consists of two surface stations and one borehole station. The two surface stations (ILLEZ and FULLY) were placed within approximately 5 kilometres of the deep borehole to optimally complement the SED's existing network. The borehole station (LAVEY) was installed in an existing 170-metre-deep hole near the deep borehole at the Lavey-les-Bains spa. A strong motion sensor was also installed on the surface at the same location.