Abstract
Tilt data obtained from July 1983-January 1986 at three sites in the Central Apennines (Italy) have been examined. A filtering of raw recordings indicated the existence of residual anomalies. Attempting a correlation between such anomalies and regional seismicity (3.0 </ magnitude M </ 5.4) has allowed us to interpret the anomalies as possible preseismic variations. The results seem to confirm the existence of a relation between precursor time T, earthquake magnitude M and epicentral distance R. Finally, the presence of a time delay between the onsets of the anomalies detected at different sites for the same earthquake gives further credit to the possibility of the existence of their propagation.
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