MULTICOMPONENT STRAIN SEISMOGRAPH.
Abstract
Principal emphasis was placed on ascertaining that the vertical strain seismometer has the correct phase response. Observations of P waves near 1 cps indicate the existence of a phase mismatch as large as 35 deg between vertical strain and vertical inertial outputs; however, P waves at the same frequency do not indicate a phase discrepancy between vertical strain and crossed-strain outputs. Measurements of system phase using a recently installed variable-capacitance transducer on the vertical strain seismometer bear out the possibility of the existence of a phase shift that deviates as much as 35 deg from the desired response. At present it cannot be determined whether the phase relations among the instruments for various signals have a fixed pattern, nor can it be definitely determined that the vertical strain seismometer has a phase discrepancy.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 11, 1966
- Accession Number
- AD0482922
Entities
Organizations
- Geotech Instruments (United States)