Method and apparatus for detecting rock movement

Details Method and apparatus for detecting rock movement Method and apparatus for detecting rock movement

1998-04-29

2000-07-04

Oda, Christine K.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

By magnetic means

324326, G01V 310

Patent

active

060844132

ABSTRACT:
A method and apparatus for detecting rock movement. The first step involves using at least one electromagnetic induction coil as a sensor. The second step involves monitoring changes in induced electromotive force in the at least one electromagnetic induction coil over a selected time interval. This new approach is based upon changes in magnetic permeability as a result of rock movement in accordance with Faraday's law of electromagnetic induction. When a plurality of these new sensors are used the speed of the rock movement may also be determined.

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