Publication Date:
2009-05-01
Description:
A new type of rotation seismometer is proposed using a fluid ring-shaped sensor, where the inertial mass is a liquid moving in the tube attached to a pier to measure rotational movements. Rotational components of seismic waves, which are strong enough to twist heavy objects on the Earth's surface in the epicenter zone of an earthquake, decrease rapidly with distance. These weak rotational components may easily vanish in standard seismograms displaying translational displacements. In the proposed fluid, seismometer translational displacements are mutually compensated so that weak rotational vibration components become easily identifiable and recognizable. The technical and physical parameters of such a fluid ring device were tested and evaluated. The proposed fluid seismometer was primarily designed for observing rotational movements in the near field of earthquakes. However, it may also be used for monitoring undesirable rotational effects in large engineering works.
Print ISSN:
0037-1106
Electronic ISSN:
1943-3573
Topics:
Geosciences
,
Physics
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