DEVELOPMENT OF A THREE-AXIS LONG-PERIOD SEISMOGRAPH
Final rept. 1 Jun 1967-31 Dec 1969
LITTLE (ARTHUR D) INC CAMBRIDGE MA
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Three-axis, long-period, compact borehole seismometer system utilizing feedback-controlled seismic transducers based on magnetic suspension principle was developed, constructed and tested. The system includes digital tape recording and data processing. The overall system response is flat to 3db over a pass band from .02 to .07 Hz and the dynamic range is 60db. Results of tests show that surface waves from teleseismic events of m sub b less than or equal to 5 are consistently recorded. Horizontal components of surface waves from earthquakes in the Gulf of California region have been observed at the Ogdensburg, New Jersey test site.