In petroleum exploration by seismicity, recording devices set at intervals along a line to a central receiver, measuring intensity of the return at points along the line from a shock wave causated by detonation of an explosive device.

'Jug' often used for jail in N. Am.
Cartoonists often draw the G. W. with jug ears...

See the thread on 'jars' as in "lets drink a jar or two.' I put a link there to a museum photo of a jar- which was a small liquor jug, abong other things. Both words have many meanings.