Has Anyone ever made a horizontal Geophone
using the pendulum idea with the magnet
attached to as the weight of a pendulum
and the coil fixed to the earth and
free to move in all horizontal directions ?
I would be interested in knowing what you
used to dampen the mass and what overall
gain you needed on the amplifier.
The idea here is to get first time of arrival
only and not worry about direction of ground motion.

gmvoeth

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