A system and a method for detecting, locating and identifying incidents of
approaching a linear installation (e.g.--buried pipe line, railway, fence
etc.), that includes plurality of sensing units positions in an array
along the length of the linear installation, at a distance one from each
other, wherein each unit includes at least one sensor for sensing seismic
or acoustic interference or noise/s (in accordance with the configuration
of the system, namely either as buried system or as an above the ground
one), and the issuance of a suiting indicating signal; a signal processor
for analyzing the signal and comparing it to a cache (data bank) of
seismic or acoustic interference or noise signatures that is embedded in
the sensor unit; and a communications device for transferring data from
the sensor unit to a distant command and control center.