Long-Period Triaxial Seismograph Development.
Abstract
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 09, 1969
- Accession Number
- AD0852990
Entities
People
- A. W. Simmons
Organizations
- Geotech Instruments (United States)