Long-Period Triaxial Seismograph Development.
Final rept. 15 Jun 66-28 Feb 69,
GEOTECH GARLAND TX
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A long-period triaxial seismometer was designed for shallow hole operation. The design has preserved ideal La Coste geometry, in that changes in period are accomplished through a controlled positive restoring force. Laboratory tests and field evaluations were made to determine the effect of temperature and tilt on mass position and free period of the seismometer. Redesign of the seismometer, based on engineering evaluation and field reports, resulted in a reduction of the number of components and functions required and in turn resulted in an overall cost reduction for a complete seismograph. A thermal noise experiment was made and the spectra and coherence of the noise as recorded by the long-period triaxial and the standard long-period seismographs at UBSO were computed. Author
- Seismic Detection and Detectors