Old (but still operating) analog seismic recorders (left) with its 3D seismometer-unit (right). The IGPH has 15 of such models (ASS-6/12)  produced by "Cherepakha" Company (Russia) in the sixties. The instrumentation in the E-lab. is completed with two play-back analog systems. These analog stations are used only for passive seismology, in local and temoprary networks. In a separate sheet you can read their technical data. The last important land survey with these operating stations has been in Summer 1996, in the frame of the International European Project "TACIS", monitoring seismic noise at Chernobyl area (see ISMES Report: "Re-evaluation of seismic input for Chernobyl NPP", 1997, vol. 1,2).