tiltmeter
tiltmeter An instrument used to measure the change in ground slope. Using laser technology, small changes in the relative levels of three connected but displaced fluid reservoirs are accurately measured to monitor the direction and magnitude of slope changes. Changes of a fraction of a radian can be monitored by this instrument. Tiltmeters are particularly useful on active volcanoes for measuring the rate of ground inflation or deflation prior to and during an eruptive event. Areas showing large ground inflations are usually correlated with magma rising into the high-level volcanic plumbing system and may pinpoint the potential site of an eruption.
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tiltmeter