Tiltmeter
Tiltmeter :
An instrument designed to measure changes in the direction of (or angle to) the local surface normal. Tilt at the Earth's surface is equivalent to the horizontal components of rotation. Mechanically based tiltmeters are in general sensitive to horizontal acceleration, according to the separation distance of axis and center of mass. At very long periods (Earth's eigenmodes, Earth tides) the horizontal components of ground motion recorded by inertial sensors may contain substantial contributions due to tilts (see section 5.3.3 in Chapter 5 of this Manual)
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