Development of LP Wave Discrimination Capability Using LP Strain Instruments

摘要

The final report describes the development, construction, operation, data collection and data processing associated with the strain/inertial seismograph at Queen Creek, Arizona (QC-AZ), from 1 July 1968 to 1 June 1972. Strain seismographs were matched in sensitivity, amplitude, and phase to long-period (LP) inertial seismographs at 100K magnifications. Strain sensitivities of 2.5 x 10 to the minus 13th power at 30 sec were achieved. Operating magnifications were limited by ambient unrest of the ground which even for this quiet site was 6 dB or more above instrument noise at all periods from 0.1 to 2560 sec. The strain and inertial seismographs were combined to form an on-line directional array to enhance and to separate seismic waves. (Author)