Registration of seismic signals by tidal devices

Possibility of use of tidal devices for record of seismic waves from earthquakes and other geodynamic events is studied. It is investigated the inertial and gravitational contribution of   seismic signal to pendular seismometers and tidal devices (seismotiltmeter and gravimeter). These are identical devices and differ stability of blocks and in filtration parameters. Tidal devices are more sensitive in over-long-period area where the gravitational contribution is more. It is given examples of record of seismic fluctuations by tidal devices at some earthquakes.