A tiltmeter is an instrument designed to measure very small changes from the horizontal level, either on the ground or in a borehole. In the geosciences tiltmeters are used extensively for monitoring volcanos, the response of dams, potential landslides, and the orientation and volume of hydraulic fractures. Twenty-Six borehole tiltmeters were installed during the construction of the Plate Boundary Observatory, all located on volcanoes in Alaska, Mt St Helens and Yellowstone. These instruments, manufactured by Applied Geomechanics, are capable of resolving changes in tilt on the order of 5 nanoradians.
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National Aeronautics and |
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National |
Overview
2010